CN104866635A - Dent resistance simulation analysis pressure head modeling method for car body outer cover part outer plate - Google Patents
Dent resistance simulation analysis pressure head modeling method for car body outer cover part outer plate Download PDFInfo
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- CN104866635A CN104866635A CN201410060277.3A CN201410060277A CN104866635A CN 104866635 A CN104866635 A CN 104866635A CN 201410060277 A CN201410060277 A CN 201410060277A CN 104866635 A CN104866635 A CN 104866635A
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Abstract
The invention provides a dent resistance simulation analysis pressure head modeling method for a car body outer cover part outer plate. The method comprises the following steps: creating a pressure head three-dimensional model, wherein the created pressure head three-dimensional model comprises a main body and a head part of a pressure head and the head part is connected to one end part of the main body; partitioning finite element networks for the main body and the head part of the pressure head of the pressure head three-dimensional model respectively; and assigning a rigid body attribute to the finite element network of the main body, and assigning a flexible body attribute to the finite element network of the head part to obtain a pressure-head finite element model. According to the dent resistance simulation analysis pressure head modeling method, the finite element network of the head part is assigned with the flexible body attribute, namely, the head part is defined as a flexible body, so that the pressure head does not cause additional displacement of a dent resistance analysis point on the car body outer cover part outer plate, and the efficiency and accuracy of simulation analysis are high.
Description
Technical field
The present invention relates to body of a motor car outer covering piece outside plate dent resistance simulation analysis technical field, particularly relate to a kind of body outer panel outside plate dent resistance simulation analysis pressure head modeling method.
Background technology
The body outer panel outside plate (as door skin, side-wall outer-plate, beater or beat-up, engine hood outer panel, boot outside plate and roof outer panel etc.) of automobile can deform when bearing certain load, i.e. so-called " depression ", usually body outer panel outside plate is born external load effect, the flexure of opposing depression and local dent are out of shape, keep the ability of original shape to be called the dent resistance of body outer panel outside plate.Because vehicle exterior cladding element outside plate can by consumer's finding; if namely there is larger distortion bearing less load in outside plate; to the impression of consumer for car mass be had a strong impact on, even can cause whole brand " Crisis of Quality ", cause the heavy economic losses of enterprise.Therefore, must ensure that body outer panel has enough dent resistances.Adopt the method for simulation analysis to carry out the dent resistance of Pre feasibility body outer panel outside plate, greatly can reduce cost of development, can also development efficiency be improved simultaneously, and can ensure, before sample car manufactures, just can reach design object.Visible, body outer panel outside plate dent resistance simulation analysis has important practical value.
At present, in industry, the modeling of existing scheme pressure head is all that entirety is defined as rigid body.Discovery is studied through the present inventor, due to pressure head model is defined as rigid body, there is the problem that pressure head hardness is bigger than normal, pressure head and body outer panel outside plate rigid contact cause the displacement distortion of the anti-recessed analysis site of body outer panel outside plate in simulation analysis (a displacement part for anti-recessed analysis site is caused by pressure head itself), and then cause the precision of the dent resistance simulation analysis of body outer panel outside plate to reduce.When the outer surface curvature of outside plate is complicated, there is the curvature of constantly change in body outer panel outside plate in the loading procedure of concentrated force or uniformly distributed load, and the pressure head of rigid body attribute does not produce distortion, thus, be difficult to the contact relation setting up pressure head and body outer panel outside plate, even if through debugging model repeatedly, also analysis result may be can not get, namely the exterior surface analysis of pressure head and body outer panel outside plate is caused not easily to restrain, and then add the model debugging time, make the efficiency of simulation analysis and precision not high.
Summary of the invention
Technical matters to be solved by this invention is all that entirety is defined as rigid body for existing pressure head modeling, there is the defect that pressure head hardness is bigger than normal and then cause the precision of the dent resistance simulation analysis of body outer panel outside plate to reduce, a kind of body outer panel outside plate dent resistance simulation analysis pressure head modeling method is provided.
The present invention solves the problems of the technologies described above adopted technical scheme, and provide a kind of body outer panel outside plate dent resistance simulation analysis pressure head modeling method, described method comprises:
Create pressure head three-dimensional model, wherein, the described pressure head three-dimensional model of establishment comprises crimp body and is connected to the ram head of described crimp body one end;
Respectively finite element grid is divided to the pressure head body of described pressure head three-dimensional model and ram head;
Give the finite element grid rigid body attribute of described pressure head body, give the finite element grid flexible body attribute of described ram head, obtain pressure head finite element model.
Further, described " dividing finite element grid respectively to the pressure head body of described pressure head three-dimensional model and ram head " is specially:
The pressure head body of described pressure head three-dimensional model is divided into the finite element grid of shell unit form, the pressure head body of described pressure head three-dimensional model is divided into the finite element grid of solid element form.
Further, cylindrically, described ram head is circular arc to described crimp body, and the bottom of described ram head is docked with described crimp body one end.
Further, the external diameter of described pressure head body is 80mm, and the arc radius of the outside surface of described ram head is 132.2mm; The length of described pressure head body is 36mm, and the wall thickness of described pressure head body is 2mm, and the wall thickness of described ram head is 2mm.
According to body outer panel outside plate dent resistance simulation analysis pressure head modeling method of the present invention, when pressure head modeling, give the finite element grid flexible body attribute of described ram head, like this, in analytic process, ram head can produce the curvature that deformation constantly changes to adapt to body outer panel outside plate, like this, can ensure that the contact of ram head and body outer panel outside plate is more abundant, contact analysis is more easily restrained.Meanwhile, because ram head is flexible body, like this, pressure head itself can not cause the additional displacement of the anti-recessed analysis site of body outer panel outside plate, and efficiency and the precision of simulation analysis are higher.
In addition, present invention also offers a kind of body outer panel outside plate dent resistance simulating analysis, described method comprises:
According to above-mentioned method establishment pressure head finite element model;
Described pressure head finite element model is imported in the finite element model of body outer panel to be analyzed, and make described pressure head perpendicular to the outside surface of described body outer panel outside plate and described ram head just to the anti-recessed analysis site that described body outer panel outside plate is preset, adjust described ram head and described distance to predeterminable range resisting recessed analysis site;
According to the contact attribute of the outside surface of predefined described ram head and the outside surface of described body outer panel outside plate, the reference point that described pressure head is preset load the outside surface perpendicular to described body outer panel outside plate and increases to the predetermined load of maximal value by 0 gradually, then being reduced gradually to be carried in the predetermined load in described reference point by maximal value to 0; Or, according to the contact attribute of the outside surface of predefined described ram head and the outside surface of described body outer panel outside plate, the reference point that described pressure head is preset loads the appointment forced displacement perpendicular to described body outer panel outside plate, then unloads described appointment forced displacement and make described pressure head rollback to initial position;
The dent resistance that computing obtains described anti-recessed analysis site analyzes data.
Further, the contact attribute of the outside surface of described ram head and the outside surface of described body outer panel outside plate is predefined as:
Define the outside surface of described ram head and the outside surface of described body outer panel outside plate is surface of contact, the outside surface of described body outer panel outside plate is interarea, the outside surface of described ram head is from face, and the way of contact of the outside surface of described ram head and the outside surface of described body outer panel outside plate is little slippage.
Further, described reference point is the geometric center of described pressure head body.
Further, described appointment forced displacement obtains by the following method:
Described reference point loads the limit forced displacement that is greater than described appointment forced displacement, described reference point place is set and exports Contact reaction-force;
Computing obtains the described anti-displacement data of recessed analysis site in described movable press head process and the Contact reaction-force data at described reference point place;
Setting the displacement of described anti-recessed analysis site when Contact reaction-force is specified in the output of described reference point place is described appointment forced displacement.
Further, the value of described limit forced displacement is 20mm.
Further, the value of described appointment Contact reaction-force is 400N.
Further, described " dent resistance that computing obtains described anti-recessed analysis site analyzes data " comprising:
Computing obtains the described anti-displacement data of recessed analysis site in described movable press head process, obtains maximum distortion and the residual deformation of described anti-recessed analysis site with this;
Computing obtains described reference point and is in the Contact reaction-force data exported in described movable press head process.
Further, also comprise after described " dent resistance that computing obtains described anti-recessed analysis site analyzes data ":
In conjunction with the Contact reaction-force data that displacement data and the described reference point place of described anti-recessed analysis site export, draw the anti-recessed analysis loading-unloading curve of described body outer panel outside plate, described anti-recessed analysis loading-unloading curve is made up of loading curve and unloading curve, wherein
Described loading curve represents in the process of described pressure head towards the movement of described body outer panel outside plate, the corresponding relation of the Contact reaction-force that the displacement of described anti-recessed analysis site and described reference point place export;
Described unloading curve represents in described pressure head back off procedure, the corresponding relation of the Contact reaction-force that the displacement of described anti-recessed analysis site and described reference point place export.
According to body outer panel outside plate dent resistance simulating analysis of the present invention, when pressure head modeling, give the finite element grid flexible body attribute of described ram head, like this, in analytic process, ram head can produce the curvature that deformation constantly changes to adapt to body outer panel outside plate, like this, can ensure that the contact of ram head and body outer panel outside plate is more abundant, contact analysis is more easily restrained.Meanwhile, because ram head is flexible body, like this, pressure head itself can not cause the additional displacement of the anti-recessed analysis site of body outer panel outside plate, and efficiency and the precision of simulation analysis are higher.
Accompanying drawing explanation
Fig. 1 is the FB(flow block) of the body outer panel outside plate dent resistance simulation analysis pressure head modeling method that one embodiment of the invention provides;
Fig. 2 be pressure head three-dimensional model partly cut open figure;
Fig. 3 is the vertical view of pressure head three-dimensional model;
Fig. 4 is the schematic diagram of pressure head finite element model;
Fig. 5 is the FB(flow block) of the body outer panel outside plate dent resistance simulating analysis that one embodiment of the invention provides;
Fig. 6 is the schematic diagram of anti-recessed analysis loading-unloading curve;
Fig. 7 is the FB(flow block) of the body outer panel outside plate dent resistance simulating analysis that another embodiment of the present invention provides.
Reference numeral is as follows:
10, pressure head body; 20, ram head.
Embodiment
In order to make technical matters solved by the invention, technical scheme and beneficial effect clearly understand, below in conjunction with drawings and Examples, the present invention is described in further detail.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
As shown in Figure 1, the body outer panel outside plate dent resistance simulation analysis pressure head modeling method that one embodiment of the invention provides comprises the steps:
101, create pressure head three-dimensional model, wherein, as shown in Figures 2 and 3, it comprises crimp body 10 and is connected to the ram head 20 of described crimp body 10 1 end the described pressure head three-dimensional model of establishment.The software creating pressure head three-dimensional model can be Auto CAD, Catia and UG etc.
In the present embodiment, cylindrically, described ram head 20 is in circular arc, and the bottom of described ram head 20 is docked with described crimp body 10 1 end for described crimp body 10.Pressure head body 10 external diameter can not too greatly can not be too little, then can not detect too greatly the dent resistance of regional area; Too young pathbreaker's point of causing needs to detect is too much, workload is increased, and in order to better investigate the dent resistance of outside plate, ram head 20 must be set to circular arc; Preferably, the outer diameter D 1 of described pressure head body 10 is 80mm, and the arc radius R1 of the outside surface of described ram head is 132.2mm; In addition, the length L1 of described pressure head body is 36mm, and the wall thickness of described pressure head body is 2mm, and the wall thickness of described ram head 20 is 2mm; Preferably, the inside surface of described ram head 20 is parallel with its outside surface, and namely the arc radius of the inside surface of described ram head 20 is 132.2mm.
102, GTD model is carried out to the described pressure head three-dimensional model created.Described GTD model carries out in pre-processing software, and described GTD model comprises removes point, line, little chamfering and small sircle hole unnecessary in pressure head three-dimensional model, and supplies the face and line that lack in pressure head three-dimensional model.Described pre-processing software is finite element analysis software, such as Hypermesh or ANSYS.
103, respectively finite element grid is divided to the pressure head body 10 of described pressure head three-dimensional model and ram head 20; Be specially, as shown in Figure 4, the pressure head body 10 of described pressure head three-dimensional model be divided into the finite element grid W1 of shell unit form, the pressure head body 20 of described pressure head three-dimensional model be divided into the finite element grid W2 of solid element form.Preferably, the length of side of finite element grid W1 and finite element grid W2 is 6mm.Pressure head body 10 in simulation analysis process not with outer covering piece surface contact, be applicable to adopt shell unit divide finite element grid, there is no need all to be drawn as solid element.Such process can reduce pressure head number of grid, reduces model computing time.The process pressure head body 10 of described pressure head three-dimensional model and ram head 20 being divided respectively to finite element grid is also carried out in above-mentioned pre-processing software.If the finite element style divided is undesirable (size or Jacobian matrix undesirable), then again finite element grid is divided, until qualified to the pressure head body 10 of described pressure head three-dimensional model and ram head 20.
104, give the finite element grid W1 rigid body attribute of described pressure head body 10, give the finite element grid W2 flexible body attribute of described ram head 20, obtain pressure head finite element model.Pressure head body 10 does not directly contact with body outer panel outside plate, mainly plays transmitted load, adopts rigid body can express dynamic changes process relation, can reduce again the calculating scale of finite element model, raise the efficiency.And ram head 20 directly contacts with body outer panel outside plate, because body outer panel outside plate is when by load effect, there is the curvature of constantly change, ram head 20 is set to flexible body (such as elastomeric material), can ensure that ram head 10 is more abundant with the contact of body outer panel outside plate, the exterior surface analysis of pressure head and body outer panel outside plate is more easily restrained.
Body outer panel outside plate dent resistance simulation analysis pressure head modeling method according to the above embodiment of the present invention, when pressure head modeling, give the finite element grid flexible body attribute of described ram head, like this, in analytic process, ram head can produce the curvature that deformation constantly changes to adapt to body outer panel outside plate, like this, can ensure that the contact of ram head and body outer panel outside plate is more abundant, contact analysis is more easily restrained.Meanwhile, because ram head is flexible body, like this, pressure head itself can not cause the additional displacement of the anti-recessed analysis site of body outer panel outside plate, and efficiency and the precision of simulation analysis are higher.
In addition, as shown in Figure 5, one embodiment of the invention additionally provides a kind of body outer panel outside plate dent resistance simulating analysis, and described method comprises the steps:
201, create pressure head three-dimensional model, wherein, as shown in Figures 2 and 3, it comprises crimp body 10 and is connected to the ram head 20 of described crimp body 10 1 end the described pressure head three-dimensional model of establishment.The software creating pressure head three-dimensional model can be Auto CAD, Catia and UG etc.
In the present embodiment, cylindrically, described ram head 20 is in circular arc, and the bottom of described ram head 20 is docked with described crimp body 10 1 end for described crimp body 10.Pressure head body 10 external diameter can not too greatly can not be too little, then can not detect too greatly the dent resistance of regional area; Too young pathbreaker's point of causing needs to detect is too much, workload is increased, and in order to better investigate the dent resistance of outside plate, ram head 20 must be set to circular arc; Preferably, the outer diameter D 1 of described pressure head body 10 is 80mm, and the arc radius R1 of the outside surface of described ram head is 132.2mm; In addition, the length L1 of described pressure head body is 36mm, and the wall thickness of described pressure head body is 2mm, and the wall thickness of described ram head 20 is 2mm; Preferably, the inside surface of described ram head 20 is parallel with its outside surface, and namely the arc radius of the inside surface of described ram head 20 is 132.2mm.
202, GTD model is carried out to the described pressure head three-dimensional model created.Described GTD model carries out in pre-processing software, and described GTD model comprises removes point, line, little chamfering and small sircle hole unnecessary in pressure head three-dimensional model, and supplies the face and line that lack in pressure head three-dimensional model.Described pre-processing software is finite element analysis software, such as Hypermesh or ANSYS.
203, respectively finite element grid is divided to the pressure head body 10 of described pressure head three-dimensional model and ram head 20; Be specially, as shown in Figure 4, the pressure head body 10 of described pressure head three-dimensional model be divided into the finite element grid W1 of shell unit form, the pressure head body 20 of described pressure head three-dimensional model be divided into the finite element grid W2 of solid element form.Preferably, the length of side of finite element grid W1 and finite element grid W2 is 6mm.Pressure head body 10 in simulation analysis process not with outer covering piece surface contact, be applicable to adopt shell unit divide finite element grid, there is no need all to be drawn as solid element.Such process can reduce pressure head number of grid, reduces model computing time.The process pressure head body 10 of described pressure head three-dimensional model and ram head 20 being divided respectively to finite element grid is also carried out in above-mentioned pre-processing software.If the finite element style divided is undesirable (size or Jacobian matrix undesirable), then again finite element grid is divided, until qualified to the pressure head body 10 of described pressure head three-dimensional model and ram head 20.
204, give the finite element grid W1 rigid body attribute of described pressure head body 10, give the finite element grid W2 flexible body attribute of described ram head 20, obtain pressure head finite element model.Pressure head body 10 does not directly contact with body outer panel outside plate, mainly plays transmitted load, adopts rigid body can express dynamic changes process relation, can reduce again the calculating scale of finite element model, raise the efficiency.And ram head 20 directly contacts with body outer panel outside plate, because body outer panel outside plate is when by load effect, there is the curvature of constantly change, ram head 20 is set to flexible body (such as elastomeric material), can ensure that ram head 10 is more abundant with the contact of body outer panel outside plate, the exterior surface analysis of pressure head and body outer panel outside plate is more easily restrained.
205, described pressure head finite element model is imported in the finite element model of body outer panel to be analyzed, and make described pressure head perpendicular to the outside surface of described body outer panel outside plate and described ram head just to the anti-recessed analysis site that described body outer panel outside plate is preset, adjust described ram head and described distance to predeterminable range resisting recessed analysis site; Reserved certain gap (predeterminable range) between surface of contact, can make contact process more mild, be conducive to contact analysis convergence.The preferred value of this predeterminable range is 1mm.In the present embodiment, the finite element model of body outer panel is present in ABAQUS or Radioss software, and namely pressure head finite element model is directed in ABAQUS or Radioss software and carries out simulation analysis.
206, according to the contact attribute of the outside surface of predefined described ram head and the outside surface of described body outer panel outside plate, the reference point that described pressure head is preset load the outside surface perpendicular to described body outer panel outside plate and increases to the predetermined load of maximal value by 0 gradually, then being reduced gradually to be carried in the predetermined load in described reference point by maximal value to 0.
In the present embodiment, the contact attribute of the outside surface of described ram head and the outside surface of described body outer panel outside plate is predefined as:
Define the outside surface of described ram head and the outside surface of described body outer panel outside plate is surface of contact, the outside surface of described body outer panel outside plate is interarea, the outside surface of described ram head is from face, and the way of contact of the outside surface of described ram head and the outside surface of described body outer panel outside plate is little slippage.Harder face (outside surface of body outer panel outside plate) is set to interarea, and softer face (outside surface of ram head) is set to from face, and the contact analysis of pressure head and body outer panel outside plate is more easily restrained.In actual contact process, the axis of pressure head should remain on identical position, does not allow larger slippage occurs between surface of contact, and therefore, the way of contact of the outside surface of described ram head and the outside surface of described body outer panel outside plate is set to little slippage.Contact attribute can set in advance in ABAQUS or Radioss software.
In the present embodiment, described reference point is the geometric center of described pressure head body.Like this, described predetermined load is carried in the geometric center place of the pressure head body of described rigid body attribute, and the loading of predetermined load is more even.Preferably the maximal value of described predetermined load is 400N, and namely predetermined load increases to 400N gradually by 0 and is carried in described reference point.Through a large amount of practice and data accumulation, under 400N load, the anti-recessed process of research body outer panel outside plate that can be detailed, and load when can identify body outer panel outside plate generation flexing.
207, computing obtains the dent resistance analysis data of described anti-recessed analysis site.
In the present embodiment, described dent resistance is analyzed data and is comprised the displacement data of described anti-recessed analysis site in described movable press head process and described reference point is in the Contact reaction-force data exported in described movable press head process.Described " dent resistance that computing obtains described anti-recessed analysis site analyzes data " comprising:
(1) computing obtains the described anti-displacement data of recessed analysis site in described movable press head process, obtains maximum distortion and the residual deformation of described anti-recessed analysis site with this; In loading procedure, load increases to 400N gradually by 0, and when load increases to 400N, the now displacement of described anti-recessed analysis site corresponds to the maximum distortion of described anti-recessed analysis site; And in uninstall process, load is decreased to 0 gradually by 400N, when load reduces to 0, the now displacement of described anti-recessed analysis site corresponds to the residual deformation (permanent strain) of described anti-recessed analysis site.Above-mentioned computing obtains the described anti-displacement data of recessed analysis site in described movable press head process and carries out in ABAQUS or Radioss software, its operational method be software carry function.By evaluating maximum distortion and these two parameters of residual deformation, controlling body outer panel outside plate dent resistance can meet design requirement.
(2) computing obtains described reference point and is in the Contact reaction-force data exported in described movable press head process.
208, in conjunction with the Contact reaction-force data that displacement data and the described reference point place of described anti-recessed analysis site export, draw the anti-recessed analysis loading-unloading curve of described body outer panel outside plate, described anti-recessed analysis loading-unloading curve is made up of loading curve and unloading curve; As shown in Figure 6, wherein, the solid line in Fig. 6 represents anti-loading curve to typical anti-recessed analysis loading-unloading curve, and dotted line represents unloading curve.Described loading curve represents in the process of described pressure head towards the movement of described body outer panel outside plate, the corresponding relation of the Contact reaction-force that the displacement of described anti-recessed analysis site and described reference point place export; Described unloading curve represents in described pressure head back off procedure, the corresponding relation of the Contact reaction-force that the displacement of described anti-recessed analysis site and described reference point place export.By drawing anti-recessed analysis loading-unloading curve as shown in Figure 6, the displacement (maximum distortion) when whether there is flexing phenomenon, maximum load and the residual displacement (residual deformation) after unloading can be observed in loading and uninstall process intuitively.
Body outer panel outside plate dent resistance simulating analysis according to the above embodiment of the present invention, when pressure head modeling, give the finite element grid flexible body attribute of described ram head, like this, in analytic process, ram head can produce the curvature that deformation constantly changes to adapt to body outer panel outside plate, like this, can ensure that the contact of ram head and body outer panel outside plate is more abundant, contact analysis is more easily restrained.Meanwhile, because ram head is flexible body, like this, pressure head itself can not cause the additional displacement of the anti-recessed analysis site of body outer panel outside plate, and efficiency and the precision of simulation analysis are higher.
In addition, as shown in Figure 7, another embodiment of the present invention additionally provides a kind of body outer panel outside plate dent resistance simulating analysis, and described method comprises the steps:
301, create pressure head three-dimensional model, wherein, as shown in Figures 2 and 3, it comprises crimp body 10 and is connected to the ram head 20 of described crimp body 10 1 end the described pressure head three-dimensional model of establishment.The software creating pressure head three-dimensional model can be Auto CAD, Catia and UG etc.
In the present embodiment, cylindrically, described ram head 20 is in circular arc, and the bottom of described ram head 20 is docked with described crimp body 10 1 end for described crimp body 10.Pressure head body 10 external diameter can not too greatly can not be too little, then can not detect too greatly the dent resistance of regional area; Too young pathbreaker's point of causing needs to detect is too much, workload is increased, and in order to better investigate the dent resistance of outside plate, ram head 20 must be set to circular arc; Preferably, the outer diameter D 1 of described pressure head body 10 is 80mm, and the arc radius R1 of the outside surface of described ram head is 132.2mm; In addition, the length L1 of described pressure head body is 36mm, and the wall thickness of described pressure head body is 2mm, and the wall thickness of described ram head 20 is 2mm; Preferably, the inside surface of described ram head 20 is parallel with its outside surface, and namely the arc radius of the inside surface of described ram head 20 is 132.2mm.
302, GTD model is carried out to the described pressure head three-dimensional model created.Described GTD model carries out in pre-processing software, and described GTD model comprises removes point, line, little chamfering and small sircle hole unnecessary in pressure head three-dimensional model, and supplies the face and line that lack in pressure head three-dimensional model.Described pre-processing software is finite element analysis software, such as Hypermesh or ANSYS.
303, respectively finite element grid is divided to the pressure head body 10 of described pressure head three-dimensional model and ram head 20; Be specially, as shown in Figure 4, the pressure head body 10 of described pressure head three-dimensional model be divided into the finite element grid W1 of shell unit form, the pressure head body 20 of described pressure head three-dimensional model be divided into the finite element grid W2 of solid element form.Preferably, the length of side of finite element grid W1 and finite element grid W2 is 6mm.Pressure head body 10 in simulation analysis process not with outer covering piece surface contact, be applicable to adopt shell unit divide finite element grid, there is no need all to be drawn as solid element.Such process can reduce pressure head number of grid, reduces model computing time.The process pressure head body 10 of described pressure head three-dimensional model and ram head 20 being divided respectively to finite element grid is also carried out in above-mentioned pre-processing software.If the finite element style divided is undesirable (size or Jacobian matrix undesirable), then again finite element grid is divided, until qualified to the pressure head body 10 of described pressure head three-dimensional model and ram head 20.
304, give the finite element grid W1 rigid body attribute of described pressure head body 10, give the finite element grid W2 flexible body attribute of described ram head 20, obtain pressure head finite element model.Pressure head body 10 does not directly contact with body outer panel outside plate, mainly plays transmitted load, adopts rigid body can express dynamic changes process relation, can reduce again the calculating scale of finite element model, raise the efficiency.And ram head 20 directly contacts with body outer panel outside plate, because body outer panel outside plate is when by load effect, there is the curvature of constantly change, ram head 20 is set to flexible body (such as elastomeric material), can ensure that ram head 10 is more abundant with the contact of body outer panel outside plate, the exterior surface analysis of pressure head and body outer panel outside plate is more easily restrained.
305, described pressure head finite element model is imported in the finite element model of body outer panel to be analyzed, and make described pressure head perpendicular to the outside surface of described body outer panel outside plate and described ram head just to the anti-recessed analysis site that described body outer panel outside plate is preset, adjust described ram head and described distance to predeterminable range resisting recessed analysis site; Reserved certain gap (predeterminable range) between surface of contact, can make contact process more mild, be conducive to contact analysis convergence.The preferred value of this predeterminable range is 1mm.In the present embodiment, the finite element model of body outer panel is present in ABAQUS or Radioss software, and namely pressure head finite element model is directed in ABAQUS or Radioss software and carries out simulation analysis.
306, according to the contact attribute of the outside surface of predefined described ram head and the outside surface of described body outer panel outside plate, the reference point that described pressure head is preset loads the appointment forced displacement perpendicular to described body outer panel outside plate, then unloads described appointment forced displacement and make described pressure head rollback to initial position.
In the present embodiment, the contact attribute of the outside surface of described ram head and the outside surface of described body outer panel outside plate is predefined as:
Define the outside surface of described ram head and the outside surface of described body outer panel outside plate is surface of contact, the outside surface of described body outer panel outside plate is interarea, the outside surface of described ram head is from face, and the way of contact of the outside surface of described ram head and the outside surface of described body outer panel outside plate is little slippage.Harder face (outside surface of body outer panel outside plate) is set to interarea, and softer face (outside surface of ram head) is set to from face, and the contact analysis of pressure head and body outer panel outside plate is more easily restrained.In actual contact process, the axis of pressure head should remain on identical position, does not allow larger slippage occurs between surface of contact, and therefore, the way of contact of the outside surface of described ram head and the outside surface of described body outer panel outside plate is set to little slippage.Contact attribute can set in advance in ABAQUS or Radioss software.
In the present embodiment, described reference point is the geometric center of described pressure head body.Described appointment forced displacement is carried in the geometric center place of described pressure head body.
In the present embodiment, described appointment forced displacement X
robtain in advance by the following method:
Described reference point loads one and is greater than described appointment forced displacement X
rlimit forced displacement X
0, described reference point place is set and exports Contact reaction-force;
Computing obtains the described anti-displacement data of recessed analysis site in described movable press head process and the Contact reaction-force data at described reference point place; This computing is carried out in ABAQUS or Radioss software, its operational method be software carry function.
Setting the displacement of described anti-recessed analysis site when Contact reaction-force is specified in the output of described reference point place is described appointment forced displacement X
r.Preferably, limit forced displacement X herein
0value for being set to 20mm.Because through a large amount of practice and data accumulation, find the forced displacement X when being carried on pressure head
0when being set to 20mm, the Contact reaction-force that described reference point place exports all is greater than 400N.Preferably, the value of described appointment Contact reaction-force is 400N, and the value of described appointment forced displacement is 10mm.Because, through a large amount of practice and data accumulation, when the Contact reaction-force exported at described reference point place is 400N, the anti-recessed process of research body outer panel outside plate that can be detailed, and load when can identify body outer panel outside plate generation flexing.As shown in Figure 6, in the present embodiment, when the Contact reaction-force exported at described reference point place is 400N, the appointment forced displacement X corresponding to it
rfor 10mm.
307, computing obtains the dent resistance analysis data of described anti-recessed analysis site.
In the present embodiment, described dent resistance is analyzed data and is comprised the displacement data of described anti-recessed analysis site in described movable press head process and described reference point is in the Contact reaction-force data exported in described movable press head process.Described " dent resistance that computing obtains described anti-recessed analysis site analyzes data " comprising:
(1) computing obtains the described anti-displacement data of recessed analysis site in described movable press head process, obtains maximum distortion and the residual deformation of described anti-recessed analysis site with this; In loading procedure, specify forced displacement X
rwhen loading completely, the displacement of described anti-recessed analysis site corresponds to the maximum distortion of described anti-recessed analysis site; And in uninstall process, specify forced displacement X
rwhen loading completely, the displacement of described anti-recessed analysis site corresponds to the residual deformation (permanent strain) of described anti-recessed analysis site.Above-mentioned computing obtains the described anti-displacement data of recessed analysis site in described movable press head process and carries out in ABAQUS or Radioss software, and its operational method is the function that software carries.By evaluating maximum distortion and these two parameters of residual deformation, controlling body outer panel outside plate dent resistance can meet design requirement.
(2) computing obtains described reference point and is in the Contact reaction-force data exported in described movable press head process.
308, in conjunction with the Contact reaction-force data that displacement data and the described reference point place of described anti-recessed analysis site export, draw the anti-recessed analysis loading-unloading curve of described body outer panel outside plate, described anti-recessed analysis loading-unloading curve is made up of loading curve and unloading curve; As shown in Figure 6, wherein, the solid line in Fig. 6 represents loading curve to typical anti-recessed analysis loading-unloading curve, and dotted line represents unloading curve.Described loading curve represents in the process of described pressure head towards the movement of described body outer panel outside plate, the corresponding relation of the Contact reaction-force that the displacement of described anti-recessed analysis site and described reference point place export; Described unloading curve represents in described pressure head back off procedure, the corresponding relation of the Contact reaction-force that the displacement of described anti-recessed analysis site and described reference point place export.By drawing anti-recessed analysis loading-unloading curve as shown in Figure 6, the displacement (maximum distortion) when whether there is flexing phenomenon, maximum load and the residual displacement (residual deformation) after unloading can be observed in loading and uninstall process intuitively.
Body outer panel outside plate dent resistance simulating analysis according to the above embodiment of the present invention, what the reference point of pressure head loaded is specify forced displacement (a kind of coercive boundary condition), and preferably specify forced displacement to obtain in advance, therefore, without the need to considering the Curvature varying of body outer panel outside plate in analytic process, no matter in loading procedure, the state of body outer panel outside plate is how, the anti-recessed analysis site of body outer panel outside plate finally all will reach this forced displacement, and the direction of motion of pressure head is also forced, pressure head can not produce slippage, like this, pressure head and body outer panel outside plate contact process more smooth, and hardly by problems such as the contact faults considered in pressure head and body outer panel outside plate contact process, drastically increase the efficiency of model debugging, decrease the model debugging time, improve the speed of convergence of contact analysis, drastically increase efficiency and the precision of simulation analysis.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (12)
1. a body outer panel outside plate dent resistance simulation analysis pressure head modeling method, it is characterized in that, described method comprises:
Create pressure head three-dimensional model, wherein, the described pressure head three-dimensional model of establishment comprises crimp body and is connected to the ram head of described crimp body one end;
Respectively finite element grid is divided to the pressure head body of described pressure head three-dimensional model and ram head;
Give the finite element grid rigid body attribute of described pressure head body, give the finite element grid flexible body attribute of described ram head, obtain pressure head finite element model.
2. body outer panel outside plate dent resistance simulation analysis pressure head modeling method according to claim 1, described " dividing finite element grid respectively to the pressure head body of described pressure head three-dimensional model and ram head " is specially:
The pressure head body of described pressure head three-dimensional model is divided into the finite element grid of shell unit form, the pressure head body of described pressure head three-dimensional model is divided into the finite element grid of solid element form.
3. body outer panel outside plate dent resistance simulation analysis pressure head modeling method according to claim 1, it is characterized in that, cylindrically, described ram head is circular arc to described crimp body, and the bottom of described ram head is docked with described crimp body one end.
4. body outer panel outside plate dent resistance simulation analysis pressure head modeling method according to claim 3, it is characterized in that, the external diameter of described pressure head body is 80mm, and the arc radius of the outside surface of described ram head is 132.2mm; The length of described pressure head body is 36mm, and the wall thickness of described pressure head body is 2mm, and the wall thickness of described ram head is 2mm.
5. a body outer panel outside plate dent resistance simulating analysis, is characterized in that, described method comprises:
According to the method establishment pressure head finite element model described in Claims 1-4 any one;
Described pressure head finite element model is imported in the finite element model of body outer panel to be analyzed, and make described pressure head perpendicular to the outside surface of described body outer panel outside plate and described ram head just to the anti-recessed analysis site that described body outer panel outside plate is preset, adjust described ram head and described distance to predeterminable range resisting recessed analysis site;
According to the contact attribute of the outside surface of predefined described ram head and the outside surface of described body outer panel outside plate, the reference point that described pressure head is preset load the outside surface perpendicular to described body outer panel outside plate and increases to the predetermined load of maximal value by 0 gradually, then being reduced gradually to be carried in the predetermined load in described reference point by maximal value to 0; Or, according to the contact attribute of the outside surface of predefined described ram head and the outside surface of described body outer panel outside plate, the reference point that described pressure head is preset loads the appointment forced displacement perpendicular to described body outer panel outside plate, then unloads described appointment forced displacement and make described pressure head rollback to initial position;
The dent resistance that computing obtains described anti-recessed analysis site analyzes data.
6. body outer panel outside plate dent resistance simulating analysis according to claim 5, is characterized in that, the contact attribute of the outside surface of described ram head and the outside surface of described body outer panel outside plate is predefined as:
Define the outside surface of described ram head and the outside surface of described body outer panel outside plate is surface of contact, the outside surface of described body outer panel outside plate is interarea, the outside surface of described ram head is from face, and the way of contact of the outside surface of described ram head and the outside surface of described body outer panel outside plate is little slippage.
7. body outer panel outside plate dent resistance simulating analysis according to claim 5, is characterized in that, described reference point is the geometric center of described pressure head body.
8. body outer panel outside plate dent resistance simulating analysis according to claim 5, it is characterized in that, described appointment forced displacement obtains by the following method:
Described reference point loads the limit forced displacement that is greater than described appointment forced displacement, described reference point place is set and exports Contact reaction-force;
Computing obtains the described anti-displacement data of recessed analysis site in described movable press head process and the Contact reaction-force data at described reference point place;
Setting the displacement of described anti-recessed analysis site when Contact reaction-force is specified in the output of described reference point place is described appointment forced displacement.
9. body outer panel outside plate dent resistance simulating analysis according to claim 8, is characterized in that, the value of described limit forced displacement is 20mm.
10. body outer panel outside plate dent resistance simulating analysis according to claim 8, is characterized in that, the value of described appointment Contact reaction-force is 400N.
11. body outer panel outside plate dent resistance simulating analysis according to claim 5 to 10 any one, is characterized in that, described " dent resistance that computing obtains described anti-recessed analysis site analyzes data " comprising:
Computing obtains the described anti-displacement data of recessed analysis site in described movable press head process, obtains maximum distortion and the residual deformation of described anti-recessed analysis site with this;
Computing obtains described reference point and is in the Contact reaction-force data exported in described movable press head process.
12. body outer panel outside plate dent resistance simulating analysis according to claim 11, is characterized in that, also comprise after described " dent resistance that computing obtains described anti-recessed analysis site analyzes data ":
In conjunction with the Contact reaction-force data that displacement data and the described reference point place of described anti-recessed analysis site export, draw the anti-recessed analysis loading-unloading curve of described body outer panel outside plate, described anti-recessed analysis loading-unloading curve is made up of loading curve and unloading curve, wherein
Described loading curve represents in the process of described pressure head towards the movement of described body outer panel outside plate, the corresponding relation of the Contact reaction-force that the displacement of described anti-recessed analysis site and described reference point place export;
Described unloading curve represents in described pressure head back off procedure, the corresponding relation of the Contact reaction-force that the displacement of described anti-recessed analysis site and described reference point place export.
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