CN112255087B - Material tensile strength detection system and use method thereof - Google Patents
Material tensile strength detection system and use method thereof Download PDFInfo
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- CN112255087B CN112255087B CN202011225633.4A CN202011225633A CN112255087B CN 112255087 B CN112255087 B CN 112255087B CN 202011225633 A CN202011225633 A CN 202011225633A CN 112255087 B CN112255087 B CN 112255087B
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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
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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
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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
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
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Abstract
The invention relates to a material tensile strength detection system and a use method thereof, and the system comprises a bracket, wherein three groups of sliding plates for stretching a material are annularly and equidistantly arranged on the bracket, a clamp for clamping one end of the material is arranged on each sliding plate, a rotatable hydraulic cylinder is arranged in the middle of each sliding plate, and the hydraulic cylinder rotates by an angle under the control of plc, so that a clamping piece at the front end is selectively clamped and clamped with the three groups of sliding plates, and is used for driving the clamped and clamped sliding plates to slide to perform tensile test on the material. According to the invention, through the three switchable detection groups, the tensile strength detection test is carried out on a single material and two materials, or the tensile strength detection test is carried out on three groups of materials synchronously, so that the tensile strength detection can be carried out on the materials, the materials can be compared mutually, the condition of the materials can be observed more intuitively, the detection of a plurality of materials can be carried out on words, and the detection efficiency and speed are improved.
Description
Technical Field
The invention relates to the technical field of material detection, in particular to a system for detecting the tensile strength of a material and a using method thereof.
Background
The tensile test can determine a series of strength indexes and plasticity indexes of the material. Strength generally refers to the ability of a material to resist elastic deformation, plastic deformation, and fracture under an external force. When a material is subjected to a tensile load, the phenomenon in which the load does not increase but significant plastic deformation continues is called yielding. The stress at yield, known as the yield point or physical yield strength, is expressed in σ S (pascal). There are many materials in engineering that do not have a significant yield point, and the yield strength is usually the stress value at which the material undergoes a residual plastic deformation of 0.2%, referred to as the yield limit or yield strength, and expressed as σ 0.2. The maximum stress value reached by a material before fracture, called the tensile strength or strength limit, is expressed as σ b (pascal). Tensile test refers to a test method for measuring material properties under an axial tensile load. The data obtained from the tensile test can be used to determine the elastic limit, elongation, elastic modulus, proportional limit, area reduction, tensile strength, yield point, yield strength and other tensile property indexes of the material. Creep data can be obtained from tensile tests conducted at elevated temperatures.
The existing machine for detecting the tensile strength of the material adopts a vertical design, the material is recovered and pulled through a screw or a hydraulic cylinder for tensile detection, but the existing instrument can only detect one material at a time, the comparison of multiple materials under the same pulling force cannot be carried out, the detection speed is slow, and the function is lacked.
Disclosure of Invention
Now, in order to meet the above requirements for comparing the tensile strength of a material under the same tension and performing multiple detections at one time, the invention provides a system for detecting the tensile strength of a material and a use method thereof.
The technical problem to be solved by the invention is realized by adopting the following technical scheme:
the material tensile strength detection system comprises a support, wherein three groups of sliding plates used for stretching a material are arranged on the support in an annular and equidistant mode, clamps used for clamping one end of the material are arranged on the sliding plates, a rotatable hydraulic cylinder is arranged in the middle of each sliding plate, and the hydraulic cylinder rotates by an angle under the control of plc, so that clamping pieces at the front end are selectively clamped with the three groups of sliding plates to clamp the sliding plates, and the sliding plates clamped by the clamping pieces are driven to slide to conduct tensile test on the material.
The support comprises a bottom plate, a disc is arranged on the bottom plate, a hole is formed in the center of the disc, a hydraulic cylinder is rotatably arranged in the hole, three guide plates are annularly arranged on the end face of the disc, and the inner sides of the corresponding positions of the three guide plates are respectively and correspondingly provided with one fixed clamping part of the clamp.
The three groups of sliding plates correspond to the guide plates respectively and slide in sliding grooves formed in the surfaces of the guide plates, the end faces of the free ends of the three groups of sliding plates are provided with first sensors, the upper surfaces of the three groups of sliding plates are provided with second sensors, the three groups of sliding plates are respectively a first sliding plate, a second sliding plate and a third sliding plate, the free ends of the second sliding plate and the third sliding plate lack a left corner, and a notch is formed in the middle of the free end of the first sliding plate.
The clamping piece at the front end of the hydraulic cylinder consists of an upper clamping piece and a lower clamping piece which are parallel and is provided with four groups, wherein the three groups of clamping pieces are arranged at equal intervals in a surrounding mode and are arranged to be equidistant clamps, and the other group of clamping pieces is arranged at the middle point between any two clamping pieces and is arranged to be independent clamps.
The other end face of the disc is fixedly connected with a motor, and the motor is meshed with a gear ring fixedly connected to the hydraulic cylinder through a gear of an output shaft.
Three sets of the surface of sliding plate is installed one respectively and is removed the clamping part, should remove the clamping part and three baffle side fixed clamping part one-to-one, fixed clamping part with it all includes fixed axle bed to remove the clamping part, can dismantle on the axle bed and be connected with the clamping jaw, the side of clamping jaw is provided with the telescoping cylinder.
The detection group is formed by the guide plate, the fixed clamping part on the inner side of the guide plate, the sliding plate and the movable clamping part arranged on the sliding plate.
A method for using a material tensile strength detection system comprises the following steps:
the method comprises the following steps: the plc controls the hydraulic cylinder to extend until the hydraulic cylinder is flush with the end of the corresponding sliding plate and is sensed by the first sensor, and the plc controls the motor to drive the hydraulic cylinder to rotate, so that the front end of the hydraulic cylinder is singly clamped with the right side of one sliding plate in a rotating mode every time and is sensed by the second sensor, and the hydraulic cylinder retracts to reset;
step two: when single detection is carried out, clamping a material to be detected on two clamps of a detection group corresponding to the uppermost first sliding plate, when two detections are carried out, clamping the material to be detected on the clamps of two detection groups of the second sliding plate and the third sliding plate which are positioned below, and when three detections are carried out, clamping the material to be detected on the clamps of each detection group respectively;
step three: when a single test is performed: the plc presss from both sides alone through the motor control pneumatic cylinder and pulls the detection to this first slide right side that detects the group, and when detecting two, the plc rotates equidistance through the motor control pneumatic cylinder and presss from both sides and rotate to the positive centre to can pull the detection to two second slides and the third slide that detect the group in below, when detecting three, the plc passes through the motor control pneumatic cylinder and rotates equidistance and press from both sides inclined to one side right side, thereby can all pull the detection to the sliding plate that three detected the group.
The invention has the beneficial effects that:
according to the invention, through the three switchable detection groups, the tensile strength detection test is carried out on a single material and two materials, or the tensile strength detection test is carried out on three groups of materials synchronously, so that the tensile strength detection can be carried out on the materials, the materials can be compared mutually, the condition of the materials can be observed more intuitively, the detection of a plurality of materials can be carried out on words, and the detection efficiency and speed are improved.
Drawings
The invention is further illustrated with reference to the following figures and examples.
FIG. 1 is a first perspective view of the present invention;
FIG. 2 is a second overall perspective view of the present invention;
FIG. 3 is a third perspective view of the present invention;
FIG. 4 is an overall elevational schematic of the present invention;
FIG. 5 is an overall side view schematic of the present invention;
fig. 6 is a schematic view of the structure of the clip of the present invention.
In the figure: 1. a support; 11. a base plate; 12. a disc; 13. a hole; 2. a hydraulic cylinder; 21. a gear ring; 3. a guide plate; 31. a chute; 4. a sliding plate; 41. a first slide plate; 42. a second slide plate; 43. a third slide plate; 5. a clamp; 51. a fixed clamping part; 511. a shaft seat; 512. a clamping jaw; 513. a telescopic cylinder; 52. moving the clamping part; 6. a fastener; 61. equidistant clamping; 62. independently clamping; 7. a motor; 8. plc; 81. a first sensor; 82. a second sensor.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the present invention will be described more clearly and more completely with reference to the drawings in the following embodiments, and it is understood that the described embodiments are only a part of the present invention, rather than all of the present invention, and based on the embodiments, other embodiments obtained by those skilled in the art without inventive exercise are within the protection scope of the present invention.
As shown in fig. 1 to 6, a material tensile strength detecting system includes a bracket 1, three groups of sliding plates 4 for stretching a material are annularly and equidistantly arranged on the bracket 1, a clamp 5 for clamping one end of the material is arranged on each sliding plate 4, a rotatable hydraulic cylinder 2 is arranged in the middle of each of the three groups of sliding plates 4, and the hydraulic cylinder 2 rotates by an angle under the control of plc8, so that the clamping piece 6 at the front end is selectively clamped and clamped with the three groups of sliding plates 4, and is used for driving the clamped and clamped sliding plates 4 to slide to perform a tensile test on the material. Equidistant three sets of settings can be used for carrying out same tensile test to three material simultaneously to can obtain three's tensile strength data simultaneously, also can be according to the deformation condition audio-visual comparison of material go out the difference between each material simultaneously, increase the effect of contrast, the quantity of the material that should promote simultaneously and detect.
The support 1 comprises a bottom plate 11, a disc 12 is arranged on the bottom plate 11, a hole 13 is formed in the center of the disc 12, a hydraulic cylinder 2 is arranged in the hole 13 in a rotating mode, three guide plates 3 are annularly arranged on the end face of the disc 12, and the inner sides of the corresponding positions of the three guide plates 3 are respectively and correspondingly provided with a fixed clamping part 51 of a clamp 5. The hydraulic cylinder 2 is arranged for controlling the sliding plate 4 to move on the guide plate 3, so that one end of the material to be detected is stretched, and the detection of the material to be detected is realized.
Three groups of sliding plates 4 respectively correspond to one guide plate 3 and slide in the sliding chute 31 arranged on the surface of the guide plate 3, the end faces of the free ends of the three groups of sliding plates 4 are provided with first sensors 81, the upper surface of each sliding plate is provided with second sensors 82, the three groups of sliding plates 4 are respectively provided with first sliding plates 41, second sliding plates 42 and third sliding plates 43, the free ends of the second sliding plates 42 and the third sliding plates 43 are lack of left corners, and a gap is arranged in the middle of the free end of the first sliding plate 41. The gap of the first sliding plate 41 is larger than the clamping piece of the clamping piece 6, so that when the position of the clamping piece 6 is in the middle, the clamping piece cannot be clamped and driven, the left corner of the second sliding plate 42 and the left corner of the third sliding plate 43 are absent, so that when the clamping piece 6 rotates to the left side, the second sliding plate 42 and the third sliding plate 43 cannot be driven to move, the first sliding plate 41 is controlled to move through the equidistant clamp 61, the detection is carried out, and the drawing of the first sliding plate 41 is supplemented through the independent clamp 62. The first sensor 81 is used to detect whether the slide card 6 is flush with the slide plate 4 and the second sensor 82 is used to detect the position of the slide card 6 corresponding to the surface of the slide plate 4, so that plc8 can determine whether the slide card 6 corresponds to a notch.
The clamping piece 6 at the front end of the hydraulic cylinder 2 consists of an upper clamping piece and a lower clamping piece which are parallel, four groups are arranged, wherein three groups are arranged in an equidistant mode and surround to form an equidistant clamp 61, and the other group is arranged at the middle point between any two of the groups and is provided with a single clamp 62. The sliding plates 4 are clamped in the middle by the two parallel clamping pieces through rotation, so that the sliding plates 4 are pulled through the hydraulic cylinders 2, the equidistant clamps 61 are arranged for controlling the conditions of three materials and two materials, and the independent clamps 62 are arranged for driving the sliding plates 4 at different positions to recover to the zero position.
The other end face of the disc 12 is fixedly connected with a motor 7, and the motor 7 is meshed with a gear ring 21 fixedly connected with the hydraulic cylinder 2 through a gear of an output shaft. The motor 7 drives the gear ring 21 to rotate through the gear of the output shaft, the rotation of the gear ring 21 drives the hydraulic cylinder 2 to rotate on the disc 12, so that the clamping piece 6 at the output end of the hydraulic cylinder 2 is adjusted in position, when the clamping piece 6 is vertically centered, the two sliding plates 4 below are pulled, when the clamping piece is inclined to the left, the first sliding plate 41 is pulled through the equidistant clamp 61, and when the clamping piece is inclined to the right, the three sliding plates 4 are pulled.
The surfaces of the three groups of sliding plates 4 are respectively provided with a movable clamping part 52, the movable clamping parts 52 correspond to the fixed clamping parts 51 on the sides of the three guide plates 3 one by one, the fixed clamping parts 51 and the movable clamping parts 52 respectively comprise fixed shaft seats 511, clamping jaws 512 are detachably connected on the shaft seats 511, and telescopic cylinders 513 are arranged on the side surfaces of the clamping jaws 512. The telescopic cylinder 513 is set to be hydraulic, the clamping jaws 512 can be replaced by different clamping jaws 512 according to different materials, and the telescopic cylinder 513 pushes one of the clamping jaws 512 to point to the other clamping finger to move, so that the material to be detected is clamped and fixed.
A detection group is composed of a guide plate 3, a fixed clamping part 51 on the inner side of the guide plate 3, a sliding plate 4 and a movable clamping part 52 arranged on the sliding plate 4. One detection group corresponds to one material to be detected, the fixed clamping part 51 and the movable clamping part 52 are fixedly clamped at two ends of the material to be detected, and the movable clamping part 52 slides on the guide plate 3 through the sliding plate 4 to stretch the material to be detected.
A method for using a material tensile strength detecting system, firstly, a hydraulic cylinder 2 is started through plc8 control, the hydraulic cylinder 2 is extended until a front end clamping piece 6 is sensed by a first sensor 81 at the side of the front end of a sliding plate 4 needing to be operated, the extension is stopped so that the clamping piece 6 is flush with the sliding plate 4, then plc8 controls a starting motor 7, the motor 7 drives the hydraulic cylinder 2 to rotate, a single clamp 62 at the front end of the hydraulic cylinder 2 rotates to the side of the sliding plate 4 needing to be operated and stops rotating after being sensed by a second sensor 82 at the upper surface of the sliding plate, two clamping plates of the single clamp 62 clamp 4 clamp the sliding plate 4 in the middle, then plc8 controls the hydraulic cylinder 2 to contract, the single clamp 62 pulls the sliding plate 4 to return to the original position along a sliding chute 31 of a guide plate 3, then plc controls the motor 7 to rotate the single clamp 62 to come out of the sliding plate 4, the same method, operating the next sliding plate 4 to be reset, firstly extending and leveling, then rotating the clamping piece 6, and finally contracting, pulling and resetting to slide and reset all the sliding plates 4;
when a single test is performed: clamping one end of a material to be detected on a fixed clamping part 51 on the inner side of the uppermost guide plate 3, clamping the other end of the material to be detected on a movable clamping part 52 of the first sliding plate 41, pushing respective clamping jaws 512 to firmly clamp the detection material by plc8 through the fixed clamping part 51 and a telescopic cylinder 513 on the movable clamping part 52, controlling a hydraulic cylinder 2 to be stretched to the position where the first sliding plate 41 is flush by plc8, driving the hydraulic cylinder 2 to rotate by a plc8 starting motor 7, clamping a single clamp 62 on the right side of the first sliding plate 41, sensing by a second sensor 82, starting the hydraulic cylinder 2 by plc8 to drive the first sliding plate 41 to move, and pulling the detection material to stretch to detect the strength of the detection material;
when two tests are performed: one end of a material to be detected is clamped on a fixed clamping part 51 on the inner sides of the two lowermost guide plates 3, the other end of the material to be detected is clamped on a movable clamping part 52 of the second sliding plate 42 and the third sliding plate 43, and plc8 pushes respective clamping jaws 512 to firmly clamp the material to be detected through telescopic cylinders 513 on the fixed clamping part 51 and the movable clamping part 52, then plc8 controls the hydraulic cylinder 2 to be stretched to be flush with the second sliding plate 42 and the third sliding plate 43 and is sensed by a first sensor 81, and controls a starting motor 7 to drive the hydraulic cylinder 2 to rotate by plc8, the position of the equidistant clip 61 rotating to the middle is sensed by a second sensor 82, so that the equidistant clip 61 is clamped in the middle of the first sliding plate 41, the second sliding plate 42 and the third sliding plate 43, but because a gap is arranged in the middle of the first sliding plate 41, the hydraulic cylinder 2 is started to only drive the second sliding plate 42 and the third sliding plate 43 to move, pulling the detection material to stretch, and carrying out strength detection on the detection material;
when three tests are performed: one end of a material to be detected is clamped on a fixed clamping part 51 on the inner side of each guide plate 3, the other end of the material to be detected is clamped on a movable clamping part 52 of each sliding plate 4, and plc8 pushes respective clamping jaws 512 to firmly clamp the detection material through the fixed clamping part 51 and a telescopic cylinder 513 on the movable clamping part 52, then plc8 controls a hydraulic cylinder 2 to be stretched to the position where each sliding plate 4 is flush and sensed by a first sensor 81, a plc8 starting motor 7 drives the hydraulic cylinder 2 to rotate, an equidistant clamp 61 is rotated to the right side, so that the right side of each sliding plate 4 is clamped and sensed by a second sensor 82, then plc8 starts the hydraulic cylinder 2 to drive each sliding plate 4 to move, the detection material is pulled to be stretched to detect the strength of the detection material,
when the test is completed, the hydraulic cylinder 2 is started to retract and return to the original position, and the plc8 rotates the grippers 6 of the hydraulic cylinder 2 by the motor 7 to disengage from the respective slide plates 4, and then the respective telescopic cylinders 513 are started to retract and the test material is removed from the respective clamps 5.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are merely illustrative of the principles of the invention, but that various changes and modifications may be made without departing from the spirit and scope of the invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (2)
1. A material tensile strength detecting system is characterized in that: the device comprises a bracket (1), wherein three groups of sliding plates (4) used for stretching a material are annularly and equidistantly arranged on the bracket (1), a clamp (5) used for clamping one end of the material is arranged on each sliding plate (4), a rotatable hydraulic cylinder (2) is arranged in the middle of each sliding plate (4), and the hydraulic cylinder (2) rotates by an angle under the control of a plc (8), so that a clamping piece (6) at the front end is selectively clamped and clamped with the three groups of sliding plates (4) and used for driving the clamped and clamped sliding plates (4) to slide to perform stretching test on the material; the support (1) comprises a bottom plate (11), a disc (12) is arranged on the bottom plate (11), a hole (13) is formed in the center of the disc (12), a hydraulic cylinder (2) is arranged in the hole (13) in a rotating mode, three guide plates (3) are annularly arranged on the end face of the disc (12), and the inner sides of the corresponding positions of the three guide plates (3) are respectively and correspondingly provided with a fixed clamping part (51) of the clamp (5); the three groups of sliding plates (4) correspond to one guide plate (3) respectively and slide in sliding grooves (31) formed in the surface of the guide plate (3), the end faces of the free ends of the three groups of sliding plates (4) are provided with first sensors (81), the upper surfaces of the three groups of sliding plates are provided with second sensors (82), the three groups of sliding plates (4) are provided with first sliding plates (41), second sliding plates (42) and third sliding plates (43) respectively, the free ends of the second sliding plates (42) and the third sliding plates (43) lack left corners, and gaps are formed in the middles of the free ends of the first sliding plates (41); the clamping piece (6) at the front end of the hydraulic cylinder (2) consists of an upper clamping piece and a lower clamping piece which are parallel, four groups are arranged, wherein three groups are arranged in an equidistant way to form equidistant clamps (61), and the other group is arranged at the midpoint between any two of the groups to form an independent clamp (62); the other end face of the disc (12) is fixedly connected with a motor (7), and the motor (7) is meshed with a gear ring (21) fixedly connected with the hydraulic cylinder (2) through a gear of an output shaft;
the surfaces of the three groups of sliding plates (4) are respectively provided with a movable clamping part (52), the movable clamping parts (52) correspond to the fixed clamping parts (51) on the sides of the three guide plates (3) one by one, the fixed clamping parts (51) and the movable clamping parts (52) respectively comprise fixed shaft seats (511), clamping jaws (512) are detachably connected to the shaft seats (511), and telescopic cylinders (513) are arranged on the side surfaces of the clamping jaws (512);
the detection group is formed by the guide plate (3), a fixed clamping part (51) on the inner side of the guide plate (3), the sliding plate (4) and the movable clamping part (52) arranged on the sliding plate (4).
2. The use method of the material tensile strength detection system according to claim 1, comprising the following steps: the method comprises the following steps: the plc (8) controls the hydraulic cylinder (2) to extend until the hydraulic cylinder (2) is parallel and level with the end of the corresponding sliding plate (4) and is sensed by the first sensor (81), and the plc (8) controls the motor (7) to drive the hydraulic cylinder (2) to rotate, so that the right side of the single clamp (62) at the front end of the hydraulic cylinder (2) which rotates and clamps one sliding plate (4) at a time is sensed by the second sensor (82), and the hydraulic cylinder (2) retracts and resets;
step two: when single detection is carried out, a material to be detected is clamped on two clamps (5) of a detection group corresponding to the uppermost first sliding plate (41), when two detections are carried out, the material to be detected is clamped on the clamps (5) of two detection groups of the second sliding plate (42) and the third sliding plate (43) which are positioned below, and when three detections are carried out, the material to be detected is clamped on the clamps (5) of each detection group respectively;
step three: when a single test is performed: the plc (8) controls the independent clamp (62) of the hydraulic cylinder (2) through the motor (7) to pull and detect the right side of the first sliding plate (41) of the detection group, when two detection groups are detected, the plc (8) controls the hydraulic cylinder (2) through the motor (7) to rotate the equidistant clamp (61) to the middle, so that the second sliding plate (42) and the third sliding plate (43) of the two detection groups below can be pulled and detected, when three detection groups are detected, the plc (8) controls the hydraulic cylinder (2) through the motor (7) to rotate the equidistant clamp and deviates from the right side, so that the sliding plates (4) of the three detection groups can be pulled and detected.
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| CN114279821B (en) * | 2021-12-01 | 2023-09-26 | 芜湖好得利环保科技有限公司 | Integrated testing device for tensile strength of environment-friendly bag |
| CN115165605A (en) * | 2022-07-13 | 2022-10-11 | 中钢新型材料股份有限公司 | Furnace body device for testing high-temperature tensile test of airtight graphite material |
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| CN204302094U (en) * | 2014-12-09 | 2015-04-29 | 浙江万马集团电气有限公司 | A kind of stretching clamp measuring cable accessory silastic material deformation rate |
| CN206960237U (en) * | 2017-07-18 | 2018-02-02 | 哈尔滨商业大学 | The pulling force characteristic test device of woven composite |
| CN107389461B (en) * | 2017-07-21 | 2023-10-24 | 大川精工(朝阳)有限公司 | Pulling force detects machine for dysmorphism piece |
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| CN209055412U (en) * | 2018-11-22 | 2019-07-02 | 青岛杰奥德空气减震有限公司 | A kind of rubbery human body ultimate strength test device |
| CN209542289U (en) * | 2018-12-31 | 2019-10-25 | 河南省基本建设科学实验研究院有限公司 | A kind of cupping machine |
| CN110320111B (en) * | 2019-08-02 | 2021-12-21 | 河南工程学院 | Tensile test piece, tensile test device and tensile test method |
| CN210775024U (en) * | 2019-08-16 | 2020-06-16 | 东南大学 | Mechanical property testing device for small-size rod piece |
| CN111707534B (en) * | 2020-07-03 | 2023-06-30 | 广东乐的互动娱乐股份有限公司 | Stretching detection equipment and method for intelligent toy rubber piece |
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| US4444058A (en) * | 1982-05-28 | 1984-04-24 | The United States Of America As Represented By The United States Department Of Energy | Method and apparatus for determining tensile strength |
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