CN110296903B - Mechanical property testing harness and testing method for special-shaped bone fracture plate - Google Patents
Mechanical property testing harness and testing method for special-shaped bone fracture plate Download PDFInfo
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- CN110296903B CN110296903B CN201910643078.8A CN201910643078A CN110296903B CN 110296903 B CN110296903 B CN 110296903B CN 201910643078 A CN201910643078 A CN 201910643078A CN 110296903 B CN110296903 B CN 110296903B
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- 238000012360 testing method Methods 0.000 title claims abstract description 91
- 208000010392 Bone Fractures Diseases 0.000 title claims abstract description 78
- 230000003068 static effect Effects 0.000 claims abstract description 17
- 238000005452 bending Methods 0.000 claims description 46
- 210000000988 bone and bone Anatomy 0.000 claims description 44
- 238000000034 method Methods 0.000 claims description 19
- 238000006073 displacement reaction Methods 0.000 claims description 14
- 238000009661 fatigue test Methods 0.000 claims description 6
- 229920002635 polyurethane Polymers 0.000 claims description 2
- 239000004814 polyurethane Substances 0.000 claims description 2
- 238000007689 inspection Methods 0.000 abstract description 4
- 238000010998 test method Methods 0.000 abstract description 4
- 238000001514 detection method Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 3
- 239000004484 Briquette Substances 0.000 description 2
- 238000012937 correction Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 201000010099 disease Diseases 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 235000001968 nicotinic acid Nutrition 0.000 description 1
- 230000000399 orthopedic effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/32—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0001—Type of application of the stress
- G01N2203/0005—Repeated or cyclic
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0023—Bending
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/0069—Fatigue, creep, strain-stress relations or elastic constants
- G01N2203/0075—Strain-stress relations or elastic constants
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/026—Specifications of the specimen
- G01N2203/0262—Shape of the specimen
- G01N2203/0278—Thin specimens
- G01N2203/0282—Two dimensional, e.g. tapes, webs, sheets, strips, disks or membranes
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/067—Parameter measured for estimating the property
- G01N2203/0676—Force, weight, load, energy, speed or acceleration
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/067—Parameter measured for estimating the property
- G01N2203/0682—Spatial dimension, e.g. length, area, angle
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- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention discloses a mechanical property testing fixture and a mechanical property testing method for a special-shaped bone fracture plate, and belongs to the technical field of medical instrument detection. The testing method comprises the steps of utilizing the testing fixture to conduct static mechanical property testing and dynamic fatigue mechanical property testing on the special-shaped bone fracture plate. The technical scheme provided by the invention is used for scientifically and accurately detecting the mechanical properties of the special-shaped bone fracture plate, fills the blank of a special test instrument and a test method for testing the mechanical properties of the special-shaped bone fracture plate, and has important significance in the field of medical instrument inspection.
Description
Technical Field
The invention belongs to the technical field of medical instrument inspection, in particular to a mechanical property testing fixture and a mechanical property testing method for a special-shaped bone fracture plate, which are suitable for testing the mechanical property of the special-shaped bone fracture plate.
Background
The bone fracture plate is a high-risk medical instrument for national key supervision, is a fixing device designed according to the shape of human bones and the bionics, and is generally used for treating orthopedic diseases which are caused by various reasons and need fixing treatment. The quality inspection before the use is very important, and is closely related to the physical rehabilitation condition of the patient. Adverse events of clinical suspicious medical instruments are mainly represented by fracture, bending, loosening and the like of steel plates.
Therefore, the mechanical properties such as fatigue strength of the bone fracture plate can have important influence on the service performance of the bone fracture plate, and the mechanical properties of the bone fracture plate need to be strictly detected in order to ensure the use reliability of the bone fracture plate.
The bone fracture plate comprises a straight bar-shaped bone fracture plate with a regular shape and a special-shaped bone fracture plate with an irregular shape, the special-shaped bone fracture plate is mainly used for fixing bones at joints, and at present, a test method for the mechanical properties of the straight bar-shaped bone fracture plate is specified by related industry standards, but a test method and corresponding test tools for the mechanical properties of the special-shaped bone fracture plate are not available in the prior art.
In summary, designing a tool and a method for testing mechanical properties of a special-shaped bone plate so as to scientifically and accurately test the mechanical properties of the special-shaped bone plate is a problem to be solved urgently.
Disclosure of Invention
In order to solve the defects in the prior art, the invention aims to provide a mechanical property testing harness and a testing method for a special-shaped bone fracture plate so as to realize scientific and accurate detection of the mechanical property of the special-shaped bone fracture plate.
The technical scheme adopted for solving the technical problems is as follows:
In one aspect, a mechanical property testing harness for a special-shaped bone fracture plate is provided, the mechanical property testing harness comprises a fixing seat, a pressing block and a pressing head which are matched to use, a mounting hole for mounting a detected bone fracture plate is formed in the side wall of the fixing seat, the pressing block is mounted on one side of the end portion of the detected bone fracture plate and used for transmitting loading force to the detected bone fracture plate, and the pressing head is arranged above the pressing block and used for applying the loading force to the pressing block in the testing process.
Further, the mounting holes are formed in a plurality of positions, and the mounting holes are longitudinally arranged on the side wall of the fixing seat in parallel.
Further, the fixing seat is hollow cylindrical, and the bottom end of the fixing seat is provided with a mounting flange.
Further, one side of the pressing block connected with the detected bone fracture plate is provided with an arc-shaped surface matched with the detected bone fracture plate.
Further, the rest side surfaces of the pressing block are all planes.
Further, the pressure head is flat.
On the other hand, the invention also provides a method for carrying out static mechanical test on the special-shaped bone fracture plate by using the test harness, which comprises the following steps:
The pressure head is arranged on the testing machine;
the pressing block is arranged at one end of the detected bone fracture plate with arc bending, the other end of the detected bone fracture plate is arranged at a proper position of the fixing seat, and the fixing seat is arranged on a test bed of the test machine;
starting the testing machine, wherein the pressure head applies an external load to the pressing block until the detected bone fracture plate or the matched screw is damaged;
The static bending strength of the detected bone plate is obtained.
Further, the method comprises the steps of,
When the bending rigidity is tested, the pressure head applies an additional load to the pressing block, and the control rate of the pressure head is gradually increased by 10 mm/min;
When the bending strength is tested, the pressing block generates a bending moment of 0.2% offset displacement, and the 0.2% offset displacement q is calculated by the following formula:
q＝0.002*L，
Wherein: l = moment arm;
If the detected bone fracture plate breaks before reaching the specified load, the bending moment during breaking is the bending strength; otherwise, the bending strength is obtained according to the yield load and the moment arm of the detected bone fracture plate.
On the other hand, the invention also provides a method for carrying out dynamic fatigue mechanical test on the special-shaped bone fracture plate by using the test harness, which comprises the following steps:
the pressure head is arranged on the tension-torsion fatigue testing machine;
the pressing block is arranged at one end of the detected bone fracture plate with arc bending, the other end of the detected bone fracture plate is arranged at a proper position of the fixing seat, and the fixing seat is arranged on a test bed of the tension-torsion fatigue testing machine;
The pressure head applies initial fatigue load to the pressing block to perform fatigue circulation, and the fatigue circulation lasts for at least 10 6 circulation periods when a preset test is stopped;
And obtaining the fatigue life and the fatigue strength of the detected bone fracture plate.
Further, the initial fatigue load is set to 75%, 50% and 25% of the crushing force of the detected bone plate in sequence;
and/or the number of the groups of groups,
The maximum difference between the load levels of the measured fatigue strength is not more than 10% of the bending strength of the bone plate to be tested;
and/or the number of the groups of groups,
The test frequency is 5Hz;
and/or the number of the groups of groups,
The stress ratio of the minimum load to the maximum load was 0.1.
Compared with the prior art, the invention has the beneficial effects that:
1. The testing tool and the testing method aim at testing the mechanical properties of the special-shaped bone fracture plate, fill the blank of a special testing instrument and a special testing method for testing the mechanical properties of the special-shaped bone fracture plate, and have important significance in the field of medical instrument inspection.
2. The test harness provided by the invention has the advantages that the plurality of mounting holes are longitudinally arranged on the side wall of the fixed seat in parallel, the test harness is suitable for mounting bone plates of various types, and the application range is wide.
3. According to the test harness provided by the invention, the fixed seat is hollow and cylindrical, and the mounting flange is arranged at the bottom end of the fixed seat, so that the quality of the harness is reduced, the consumable materials of the harness are reduced, and meanwhile, the operations of taking, placing, mounting and the like of the harness are facilitated.
4. According to the test harness provided by the invention, one side of the pressing block connected with the detected bone fracture plate is provided with the arc-shaped surface matched with the detected bone fracture plate, so that the suitability of the pressing block and the arc-shaped surface is better, and the accuracy of a test result is ensured.
5. The test method disclosed by the invention is reasonable in design, has a scientific theoretical basis, and is accurate and reliable in test result.
Drawings
Other features, objects and advantages of the present application will become more apparent upon reading of the detailed description of non-limiting embodiments, made with reference to the accompanying drawings in which:
FIG. 1 is a schematic view of an assembled test harness according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a pressure head of a test harness according to an embodiment of the present invention;
FIG. 3 is a schematic structural view of a fixing base of the test harness according to the embodiment of the present invention;
FIG. 4 is a schematic cross-sectional view of a cylindrical portion of a holder of a test harness according to an embodiment of the present invention;
FIG. 5 is a bottom view of FIG. 4;
FIG. 6 is a schematic diagram of an assembled structure of a press block and a bone plate to be tested according to an embodiment of the present invention;
FIG. 7 is a graph of force displacement during testing in accordance with an embodiment of the present invention.
In the figure: 1 fixing seat, 11 mounting holes, 12 screw holes, 2 pressing blocks, 3 pressing heads, 4 detected bone fracture plates and 41 fixing holes.
Detailed Description
The following description of the embodiments of the present invention will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown.
The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention.
All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other. It should be noted that, for convenience of description, only the portions related to the application are shown in the drawings.
As shown in fig. 1, one embodiment of the invention provides a mechanical property testing fixture for a special-shaped bone plate, which comprises a fixed seat 1, a pressing block 2 and a pressing head 3 which are matched for use, wherein a mounting hole 11 for mounting a tested bone plate 4 is formed in the side wall of the fixed seat 1, the pressing block 2 is mounted on one side of the end part of the tested bone plate 4 and is used for transmitting loading force to the tested bone plate 4, and the pressing head 3 is arranged above the pressing block 2 and is used for applying the loading force to the pressing block 2 in the testing process.
As shown in fig. 3, a plurality of mounting holes 11 are provided, and a plurality of mounting holes 11 are longitudinally arranged in parallel on the side wall of the fixing base 1. The plurality of mounting holes 11 are suitable for mounting bone plates of various different models, and the application scope is wide, the mounting holes 11 are screw holes, and the detected bone plate 4 can be mounted on the fixing seat 1 by adopting fastening screws during specific mounting.
The fixing base 1 is hollow cylinder-shaped, and the bottom of the fixing base 1 is provided with a mounting flange for mounting the fixing base 1 on a test bed. As shown in fig. 4 and 5, a screw hole 12 for connecting the fixing base 1 and other mounting parts may be further provided at the bottom end of the side wall of the fixing base 1. The structure can reduce the quality of the harness, reduce the consumable of the harness, and facilitate the operations of taking, placing, installing and the like of the harness.
As shown in fig. 6, the side of the pressing block 2 connected with the detected bone fracture plate 4 is provided with an arc-shaped surface matched with the detected bone fracture plate 4, and the rest side surfaces of the pressing block 2 are all planes. The structural form ensures that the suitability of the pressing block 2 and the detected bone fracture plate 4 is better, the transmission of force is more accurate, and the pressing block 2 of the embodiment adopts polyurethane blocks which accord with ASTMF 1839.
As shown in fig. 2, the ram 3 of the present embodiment is flat, and when the ram 3 is loaded on the briquette 2 in the longitudinal direction as shown in fig. 1 during the test, stress concentration on the briquette 2 during the loading is prevented.
The method for carrying out static mechanical test on the special-shaped bone fracture plate by using the test harness of the embodiment comprises the following steps:
the indenter 3 is mounted on the testing machine;
The pressing block 2 is arranged at one end of the detected bone fracture plate 4 with arc bending, the other end of the detected bone fracture plate 4 is arranged at a proper position of the fixing seat 1, and the fixing seat 1 is arranged on a test bed of the testing machine; specifically, the connecting pieces between the pressing block 2 and the detected bone fracture plate 4 and between the detected bone fracture plate 4 and the fixed seat 1 can be bolts;
Starting the testing machine, and applying an external load to the pressing block 2 by the pressure head 3 until the detected bone fracture plate 4 or the matched screw is damaged;
the static bending strength of the bone plate 4 to be tested is obtained.
Specifically, when the bending rigidity is tested, the pressure head applies an external load to the pressing block and gradually increases at a control rate of 10mm/min, a force displacement curve is shown in fig. 7, and the maximum slope (N/m) of the elastic part on the force displacement curve is the bending rigidity.
When the bending strength is tested, the pressing block generates a bending moment of 0.2% offset displacement, and the 0.2% offset displacement q is calculated by the following formula:
q＝0.002*L，
Wherein: l = moment arm;
If the detected bone fracture plate breaks before reaching the specified load, the bending moment during breaking is the bending strength; otherwise, the bending strength is obtained according to the yield load and the moment arm of the detected bone fracture plate, and the concrete steps are as follows:
if the tested bone plate breaks before the force displacement curve intersects the offset straight line BC, the bending stiffness is calculated from the following equation:
Bending stiffness=fmax x L,
Wherein: fmax = crushing force; l = moment arm.
Otherwise, as shown in fig. 7, on the force displacement graph, from the initial (linear) portion of the load displacement curve, an optimal fitting straight line OM is drawn, and the bending rigidity of the angle holder is calculated by calculating the slope of the straight line OM, specifically:
On the force displacement diagram, OB is drawn to be equal to q, then a straight line BC is drawn to be parallel to OM, and an intersection point of a force displacement curve and the straight line BC is drawn to be the yield load.
The bending strength of the tested bone plate was calculated according to the following:
Bending stiffness=p x L,
Wherein: p = yield load; l = moment arm.
The method for carrying out dynamic fatigue mechanical test on the special-shaped bone fracture plate by using the test harness of the embodiment comprises the following steps:
the pressure head 3 is arranged on the tension-torsion fatigue testing machine;
The pressing block 2 is arranged at one end of the detected bone fracture plate 4 with arc bending, the other end of the detected bone fracture plate 4 is arranged at a proper position of the fixing seat 1, and the fixing seat 1 is arranged on a test bed of the tension-torsion fatigue testing machine; the specific connection mode can be the same as that of static mechanical test;
The pressing head 3 applies an initial fatigue load to the pressing block 2 to perform fatigue cycle, and the cycle lasts for 10 6 cycles or more when a preset test is stopped; a counter can be connected to the tester to record the fatigue cycle times;
In the absence of experience, the loads corresponding to 75%,50% and 25% of the flexural strength of the bone plate, as determined by static mechanical property tests, were taken as initial fatigue loads. At the same time, the maximum difference between the load levels at which the fatigue strength is measured cannot exceed 10% of the bending strength measured by the static bending test. The method for measuring the fatigue strength of the bone plate comprises a lifting method and a correction lifting method, and the fatigue life and the fatigue strength of the bone plate to be detected are obtained.
Taking the load force of the static maximum bending strength of the detected bone fracture plate as 1000N as an example, the lifting method and the correction lifting method for measuring the fatigue strength of the bone fracture plate are described as follows:
Firstly, setting 75% of the load force of the static maximum bending strength as the initial fatigue load, in the case of the embodiment, setting 750N of initial fatigue load for fatigue circulation, after the circulation setting period, if the detected bone fracture plate is still intact, adding a certain load for fatigue circulation again, wherein the maximum difference between the load levels of the measured fatigue strength cannot exceed 10% of the bending strength measured by the static bending test, that is, the added load cannot exceed 10% of the bending strength measured by the static bending test, specifically, in the embodiment, the added fatigue load cannot exceed 10% of 1000N, that is, cannot exceed 100N, taking 10% of the load as an example for each time, after the fatigue circulation of 75% of the initial fatigue load is completed, if the detected bone fracture plate is still intact, adding 85% of the fatigue load for fatigue circulation again, after the circulation setting period, observing whether the detected bone fracture plate is damaged, if still intact, continuing to be added by up to 10% until the detected bone fracture plate is damaged.
In general, after 75% of the initial fatigue load cycle is set, most of the detected bone plates are damaged, at this time, 50% of the initial fatigue load is generally selected for fatigue cycle, still referring to the above steps, if the detected bone plates are intact after 50% of the initial fatigue load cycle is completed, 10% of the fatigue load is applied to again perform fatigue cycle, after the cycle is set, whether the detected bone plates are damaged is observed, and if still intact, up to 10% of the fatigue load is continuously increased until the detected bone plates are damaged.
If 50% of the initial fatigue load cycle is set, the detected bone plate is damaged, at this time, 25% of the initial fatigue load is usually selected for fatigue cycle, still referring to the above steps, if 25% of the initial fatigue load cycle is completed, the detected bone plate is intact, 10% of the fatigue load is added, that is, 35% of the fatigue load is applied for fatigue cycle again, after the cycle is set, whether the detected bone plate is damaged is observed, and if still intact, the number of the fatigue load is increased by at most 10% until the detected bone plate is damaged.
In the test process of increasing the fatigue load, if the detected bone plate is damaged after a certain fatigue cycle is completed, the fatigue life and the fatigue strength of the detected bone plate are obtained according to the maximum fatigue load value which is not damaged in the previous cycle.
If the detected bone plate is damaged after the initial fatigue load cycle is applied and the initial fatigue load is reduced, the detected bone plate is kept intact after the test is performed again, when the fatigue load is increased to be not more than 10% of the bending strength measured by the static bending test from the initial fatigue load of the detected bone plate, if the detected bone plate is not damaged after the fatigue cycle, the fatigue life and the fatigue strength of the detected bone plate are determined by the fatigue load in the fatigue cycle, and the fatigue load does not need to be increased continuously.
In the practice of the present invention, the initial fatigue load is not limited to the values described in the examples, but may be selected according to the actual conditions.
The above description is only illustrative of the preferred embodiments of the present application and of the principles of the technology employed. It will be appreciated by persons skilled in the art that the scope of the application referred to in the present application is not limited to the specific combinations of the technical features described above, but also covers other technical features formed by any combination of the technical features described above or their equivalents without departing from the inventive concept. Such as the above-mentioned features and the technical features disclosed in the present application (but not limited to) having similar functions are replaced with each other.
Other technical features besides those described in the specification are known to those skilled in the art, and are not described herein in detail to highlight the innovative features of the present invention.
Claims (7)
1. The mechanical property testing fixture for the special-shaped bone fracture plate is characterized by comprising a fixed seat, a pressing block and a pressing head which are matched to use, wherein the side wall of the fixed seat is provided with a mounting hole for mounting the detected bone fracture plate, the pressing block is mounted on one side of the end part of the detected bone fracture plate and used for transmitting loading force to the detected bone fracture plate, and the pressing head is arranged above the pressing block and used for applying loading force to the pressing block in the testing process;
the side, connected with the detected bone fracture plate, of the pressing block is provided with an arc-shaped surface matched with the detected bone fracture plate, the other side surfaces of the pressing block are all planes, and the pressing block adopts polyurethane blocks conforming to ASTMF 1839;
The pressure head is flat.
2. The mechanical property testing fixture for the special-shaped bone plate according to claim 1, wherein a plurality of mounting holes are formed, and the plurality of mounting holes are longitudinally arranged in parallel on the side wall of the fixing seat.
3. The mechanical property testing fixture for the special-shaped bone fracture plate according to claim 1, wherein the fixing seat is hollow and cylindrical, and the bottom end of the fixing seat is provided with a mounting flange.
4. A method of static mechanical testing of a shaped bone plate using the test harness of any one of claims 1-3, comprising:
The pressure head is arranged on the testing machine;
the pressing block is arranged at one end of the detected bone fracture plate with arc bending, the other end of the detected bone fracture plate is arranged at a proper position of the fixing seat, and the fixing seat is arranged on a test bed of the test machine;
Starting the testing machine, and applying a load to the pressing block by the pressure head until the detected bone fracture plate or the matched screw is damaged;
The static bending strength of the detected bone plate is obtained.
5. The method for static mechanical testing of a shaped bone plate of claim 4,
When the bending rigidity is tested, the pressure head applies load to the pressing block and gradually increases at the control rate of 10 mm/min;
When the bending strength is tested, the pressing block generates a bending moment of 0.2% offset displacement, and the 0.2% offset displacement q is calculated by the following formula:
q＝0.002*L，
Wherein: l = moment arm;
If the detected bone fracture plate breaks before reaching the specified load, the bending moment during breaking is the bending strength; otherwise, the bending strength is obtained according to the yield load and the moment arm of the detected bone fracture plate.
6. A method of dynamic fatigue mechanical testing of a profiled bone plate using the test harness of any one of claims 1-3, comprising:
the pressure head is arranged on the tension-torsion fatigue testing machine;
the pressing block is arranged at one end of the detected bone fracture plate with arc bending, the other end of the detected bone fracture plate is arranged at a proper position of the fixing seat, and the fixing seat is arranged on a test bed of the tension-torsion fatigue testing machine;
The pressure head applies initial fatigue load to the pressing block to perform fatigue circulation, and the fatigue circulation lasts for at least 10 6 circulation periods when a preset test is stopped;
And obtaining the fatigue life and the fatigue strength of the detected bone fracture plate.
7. The method for dynamic fatigue mechanical testing of a profiled bone plate according to claim 6, wherein the initial fatigue load is set to 75%, 50% and 25% of the static maximum flexural strength of the bone plate under test in sequence;
and/or the number of the groups of groups,
The maximum difference between the load levels of the measured fatigue strength is not more than 10% of the bending strength of the bone plate to be tested;
and/or the number of the groups of groups,
The test frequency is 5Hz;
and/or the number of the groups of groups,
The stress ratio of the minimum load to the maximum load was 0.1.
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| CN201910643078.8A CN110296903B (en) | 2019-07-17 | 2019-07-17 | Mechanical property testing harness and testing method for special-shaped bone fracture plate |
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| CN201910643078.8A CN110296903B (en) | 2019-07-17 | 2019-07-17 | Mechanical property testing harness and testing method for special-shaped bone fracture plate |
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| CN112697416A (en) * | 2020-12-23 | 2021-04-23 | 德检(江苏)检测技术有限公司 | Method for testing structure stability of universal screw and bone plate |
| CN116399716B (en) * | 2023-06-09 | 2023-08-22 | 江苏嘉斯康医疗科技有限公司 | Press for bone fracture plate test |
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