Device and equipment for measuring percentage elongation after fracture of tensile sample

Abstract

The invention discloses a device and equipment for measuring the percentage elongation after fracture of a tensile sample, and relates to the technical field of material performance test equipment, the device for measuring the percentage elongation after fracture of the tensile sample comprises: a fixed clamping seat for clamping a first part of a fractured sample; the guide rod ruler is a rod-shaped assembly, the guide rod ruler is arranged on the fixed clamping seat, and scales are arranged on the surface of the guide rod ruler; the movable clamping seat is arranged on the guide rod ruler and is used for clamping the second part of the fracture sample and sliding along the guide rod ruler; the tensioning assembly is arranged on the guide rod ruler, abuts against the movable clamping base and is used for pushing the movable clamping base in the direction from the guide rod ruler to the fixed clamping base. According to the device and the equipment for measuring the percentage elongation after fracture of the tensile sample provided by the invention, the movable clamping seat can be pushed through the tensioning assembly, so that the fractured sample can be fully butted, and the measurement precision of the percentage elongation after fracture is improved.

Description

Technical Field

[0001] This invention relates to the field of material property testing equipment, and more specifically, to a device for measuring the elongation at fracture of a tensile specimen. Furthermore, this invention also relates to an apparatus comprising the aforementioned device for measuring the elongation at fracture of a tensile specimen. Background Technology

[0002] Elongation after fracture refers to the elongation of a material at the point of fracture during tensile testing, i.e., the elongation measured after the material has fractured. It reflects the material's ability to undergo plastic deformation at fracture and can predict the risk of fracture during stress. It is one of the important mechanical properties of materials.

[0003] The measurement process of elongation after fracture is roughly as follows:

[0004] 1. Prepare tensile specimens from the material to be tested;

[0005] 2. Before the tensile test, measure the gauge length of the tensile specimen;

[0006] 3. Measure the gauge length once before and once after the material fractures;

[0007] 4. Calculate the elongation after fracture based on the measurement results.

[0008] L0 is the original gauge length, representing the gauge length of the specimen before force is applied at room temperature.

[0009] L u The gauge length after fracture is measured by tightly joining the two broken parts of the specimen together at room temperature, ensuring that the axes of the two parts are on the same straight line.

[0010] Before the tensile test, gauge lengths need to be measured on both sides of the fracture zone to determine the original gauge length L0 of the specimen. After the tensile test, the gauge length L after fracture is measured. u Using the formula A = (L u -L0) / L0×100% Calculate the elongation after fracture of the specimen.

[0011] The traditional specific operating steps are as follows:

[0012] (1) Before the tensile test begins, determine the gauge length L0 based on the cross-sectional area of ​​the specimen, and mark the gauge length line or gauge length point on the specimen surface by means of scribing, dotting, or applying with a marker pen.

[0013] (2) After the tensile test, the specimen is broken into two parts. If the specimen is plate-type, place it on a flat worktable. If the specimen is rod-type, place it in a V-groove. Visually fit the broken parts together and make sure the axes of the two parts are on the same straight line;

[0014] (3) Using measuring tools such as vernier calipers or linear rulers, visually align the measuring part of the measuring tool with the mark line or gauge point, and measure the gauge length Lu;

[0015] (4) Using the formula A = (L u -L0) / L0×100% Calculate the elongation after fracture of the specimen.

[0016] The traditional operating procedure has the following problems:

[0017] In step (1), marking the gauge length on a tensile specimen made of iron-carbon alloy is often done through a destructive method such as scribing or dotting. However, on a tensile specimen made of aluminum alloy, scribing or dotting would damage the base material, artificially creating weak points in the material's strength, thus leading to inaccurate test results. Therefore, marking with a marker pen is often used instead. If the marking method used above is done manually, the accuracy can only be maintained at a maximum of ±1mm, resulting in inaccurate gauge length.

[0018] In step (2), it is difficult to ensure by visual inspection that the two parts are aligned on a straight line and that the cross-sections fit together, resulting in poor measurement accuracy. After the operator holds the two parts of the sample with both hands, additional personnel are needed to measure the gauge length using measuring tools, which is a cumbersome process.

[0019] In step (3), during the measurement process using measuring tools, the distance between gauge lines or gauge points is measured. The marks on the lines or points themselves have a certain width and size, which will produce a measuring tool placement error of ±0.5 mm. Furthermore, when aligning the measuring tool with the gauge lines or gauge points by visual inspection, a visual error of ±0.2 mm will accumulate. Therefore, even if the measuring tool itself has high precision, the measurement accuracy will be further reduced.

[0020] In conclusion, improving the measurement accuracy of elongation after fracture is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0021] In view of this, the purpose of the present invention is to provide a device for measuring the elongation at break of a tensile specimen, which clamps the two parts of the fractured specimen by means of a fixed clamp and a movable clamp, and the tensioning component pushes the movable clamp along the guide rod to improve the measurement accuracy.

[0022] Another object of the present invention is to provide an apparatus including the above-described device for measuring the elongation at break of a tensile specimen.

[0023] To achieve the above objectives, the present invention provides the following technical solution:

[0024] A device for measuring the elongation at break of a tensile specimen, comprising:

[0025] A retaining holder is used to clamp the first part of the fractured specimen.

[0026] The guide rod ruler is a rod-shaped component, which is mounted on the fixed bracket, and the surface of the guide rod ruler is provided with scale.

[0027] A movable clamp is provided on the guide rod ruler, and the movable clamp is used to hold the second part of the fractured specimen and slide along the guide rod ruler;

[0028] A tensioning component is provided on the guide rod ruler. The tensioning component abuts against the movable bracket and is used to push the movable bracket along the guide rod ruler toward the fixed bracket.

[0029] Preferably, the fixing bracket includes a first bracket, a first slider, a first screw knob, and a first anti-detachment clip. The first slider is detachably connected to the first bracket via the first screw knob. The first anti-detachment clip is a U-shaped piece, with its two ends respectively located on the first bracket and the first screw knob.

[0030] Preferably, the movable card holder includes a second card holder, a second slider, a second screw knob, and a second anti-detachment clip. The second slider is detachably connected to the second card holder via the second screw knob. The second anti-detachment clip is a U-shaped component, with its two ends respectively located on the second card holder and the second screw knob.

[0031] Preferably, the surface of the first card holder facing the first slider is an anti-slip surface, and the surface of the second card holder facing the second slider is an anti-slip surface.

[0032] Preferably, the movable bracket further includes a secondary ruler, which is connected to the second bracket by bolts.

[0033] Preferably, the tensioning assembly includes a connecting rod, a movable slider, and a first elastic element. The movable slider has four through holes. One end of the connecting rod is a large end, and the other end is a threaded end. The second retainer has four threaded holes. The connecting rod passes through the through holes and is threadedly connected to the second retainer. The first elastic element is disposed between the four connecting rods.

[0034] Preferably, the tensioning assembly further includes a ratchet, a second elastic element, a nut, and a handle. The second elastic element is sleeved on the ratchet. The nut is threadedly connected to the second slider and is used to install the ratchet and the second elastic element inside the second slider. The handle is threadedly connected to the end of the ratchet away from the second slider.

[0035] Preferably, the guide rod ruler includes a main scale and a rack, the rack is disposed on the main scale, and each tooth of the rack has a right-angled trapezoidal structure.

[0036] Preferably, the device further includes a pressure plate, which has an i-shaped structure and threaded holes. The pressure plate is clamped to the fractured specimen by the bolts.

[0037] An apparatus comprising a tensile specimen elongation at fracture measuring device, wherein the tensile specimen elongation at fracture measuring device is any one of the tensile specimen elongation at fracture measuring devices described above.

[0038] This invention provides a device for measuring the elongation at fracture of a tensile specimen. After the specimen fractures under tension, one part of the fractured specimen is held by a fixed clamp, and the other part is held by a movable clamp. The fixed clamp is equipped with a graduated guide rod, and the movable clamp is equipped with a tensioning component. The movable clamp can slide along the guide rod, allowing the two parts of the fractured specimen to contact at the fracture surface. The tensioning component applies a pushing force to the movable clamp, pushing it towards the fixed clamp, ensuring that the two parts of the fractured specimen can fully contact at the fracture surface. At this point, the length after tension can be measured according to the graduations on the guide rod. By combining this measurement with the length data before the specimen fractures, the elongation at fracture can be calculated more accurately. Attached Figure Description

[0039] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0040] Figure 1 This is a schematic diagram of the tensile specimen elongation after fracture measuring device provided by the present invention.

[0041] Figure 2 This is a schematic diagram of the tensile specimen elongation after fracture measuring device provided by the present invention from another perspective.

[0042] Figure 3 This is a top view of the tensile specimen elongation after fracture measuring device provided by the present invention.

[0043] Figure 4 An exploded view of the tensile specimen elongation after fracture measuring device provided by the present invention.

[0044] Figure 5 An exploded view of the movable card holder and tensioning assembly provided by the present invention;

[0045] Figure 6 This is a schematic diagram of the structure of the pressure plate and sample provided by the present invention.

[0046] Figure label:

[0047] 1-Fixed bracket; 101-First bracket; 102-First slider; 103-First screw knob; 104-First anti-detachment clip; 2-Guide rod ruler; 201-Scale; 202-Main scale; 203-Rack; 3-Modible bracket; 301-Second bracket; 302-Second slider; 303-Second screw knob; 304-Second anti-detachment clip; 305-Deputy scale; 306-Bolt; 4-Tensioning assembly; 401-Connecting rod; 402-Modible slider; 403-First elastic element; 404-Ratchet; 405-Second elastic element; 406-Nut; 407-Handle; 5-Pressure plate. Detailed Implementation

[0048] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0049] The core of this invention is to provide a device for measuring the elongation at break of a tensile specimen, which can improve the measurement accuracy of the elongation at break.

[0050] Another core aspect of this invention is to provide an apparatus that includes the above-described device for measuring the elongation at break of a tensile specimen.

[0051] It should be noted that the orientation or positional relationship indicated by terms such as "upper", "lower", "front", and "rear" is based on the orientation or positional relationship shown in the accompanying drawings and is only for the purpose of facilitating the description of this application and simplifying the description. It is not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0052] This application provides a device for measuring the elongation at fracture of a tensile specimen, comprising: a fixed bracket 1, a guide rod 2, a movable bracket 3, and a tensioning assembly 4;

[0053] Among them, the fixed clamp 1 is used to hold the first part of the fractured specimen;

[0054] The guide rod ruler 2 is a rod-shaped component. The guide rod ruler 2 is mounted on the fixed bracket 1, and the surface of the guide rod ruler 2 is provided with a scale 201.

[0055] The movable clamp 3 is located on the guide rod 2. The movable clamp 3 is used to clamp the second part of the fractured specimen and slide along the guide rod 2.

[0056] The tensioning component 4 is located on the guide rod ruler 2. The tensioning component 4 abuts against the movable bracket 3 and is used to push the movable bracket 3 along the guide rod ruler 2 toward the fixed bracket 1.

[0057] For details, please refer to the appendix. Figure 1 Appendix Figure 2 With appendix Figure 3 The fixed clamp 1 is set on a horizontal plane, and the movable clamp 3 is set on the same horizontal plane as the fixed clamp 1. The fixed clamp 1 is provided with a guide rod 2 on its side, and the movable clamp 3 is provided with a through hole. The guide rod 2 can pass through the through hole of the movable clamp 3 and the movable clamp 3 can slide along the guide rod 2. After the sample is tensilely fractured, the fixed clamp 1 clamps the first part of the fractured sample, and the movable clamp 3 clamps the second part of the fractured sample. The fracture surfaces of the two parts of the fractured sample are arranged opposite each other. A tensioning component 4 is also provided on the guide rod 2. The tensioning component 4 can push the movable clamp 3 along the length direction of the guide rod 2 to ensure that the fracture surfaces of the two parts of the fractured sample can fully abut. Then, the measurement is performed through the scale 201 of the guide rod 2, and the elongation after fracture is calculated in combination with the initial length of the sample. This can greatly improve the measurement accuracy of the elongation after fracture.

[0058] Based on the above embodiments, the fixed card holder 1 includes a first card holder 101, a first slider 102, a first screw knob 103 and a first anti-detachment card 104. The first slider 102 is detachably connected to the first card holder 101 through the first screw knob 103. The first anti-detachment card 104 is a U-shaped part, and its two ends are respectively located on the first card holder 101 and the first screw knob 103.

[0059] For details, please refer to the appendix. Figure 4 The first card holder 101 has an L-shaped structure. A groove is provided on the base of the first card holder 101. A protrusion is provided on the first slider 102 within the groove. The first card holder 101 also has a threaded hole, and the first slider 102 has a through hole. The distance between the first card holder 101 and the first slider 102 can be adjusted by rotating the first screw knob 103 to clamp the fractured sample. The step fit between the first anti-disengagement card 104 and the first screw knob 103 can play an axial limiting role.

[0060] Based on the above embodiments, the movable card holder 3 includes a second card holder 301, a second slider 302, a second screw knob 303, and a second anti-detachment card 304. The second slider 302 is detachably connected to the second card holder 301 through the second screw knob 303. The second anti-detachment card 304 is a U-shaped part, and its two ends are respectively located on the second card holder 301 and the second screw knob 303.

[0061] For details, please refer to the appendix. Figure 4The second clamping seat 301 has an L-shaped structure. A groove is provided on the base of the second clamping seat 301. A protrusion is provided on the second slider 302 within the groove. The second clamping seat 301 also has a threaded hole, and the second slider 302 has a through hole. The distance between the second clamping seat 301 and the second slider 302 can be adjusted by rotating the second screw knob 303 to clamp the fractured sample. The step fit between the second anti-disengagement clip 304 and the second screw knob 303 can play an axial limiting role.

[0062] It should be noted that the overall structure of the first card holder 101 and the second card holder 301 is quite similar. The difference is that the first card holder 101 has a groove for installing the guide rod ruler 2, while the second card holder 301 has a through hole through which the guide rod ruler 2 can pass. In addition, the second card holder 301 has a secondary ruler 305, which will be mentioned later.

[0063] Based on the above embodiments, the surface of the first card holder 101 and the first slider 102 facing each other is an anti-slip surface, and the surface of the second card holder 301 and the second slider 302 facing each other is an anti-slip surface.

[0064] For details, please refer to the appendix. Figure 1 Appendix Figure 2 With appendix Figure 4 The surfaces of the first clamping seat 101 and the first slider 102 that are used to contact the first part of the fractured specimen are rough surfaces, and the surfaces of the second clamping seat 301 and the second slider 302 that are used to contact the second part of the fractured specimen are rough surfaces, so as to clamp the fractured specimen more stably.

[0065] Based on the above embodiment, the movable card holder 3 also includes a secondary ruler 305, which is connected to the second card holder 301 by bolts 306.

[0066] For details, please refer to the appendix. Figure 4 The end of the vernier scale 305 is a cylindrical hole. The second mounting base 301 has a groove that mates with the vernier scale 305. The vernier scale 305 is fixed to the second mounting base 301 by bolt 306 through a threaded connection. The vernier scale 305 is also provided with a scale, which is used in conjunction with the main scale 202 to read the distance between the fixed mounting base 1 and the movable mounting base 3.

[0067] Based on the above embodiments, the tensioning assembly 4 includes a connecting rod 401, a movable slider 402, and a first elastic member 403. The movable slider 402 is provided with four through holes. One end of the connecting rod 401 is a large end, and the other end is a threaded end. The second retainer 301 is provided with four threaded holes. The connecting rod 401 passes through the through holes and is threadedly connected to the second retainer 301. The first elastic member 403 is disposed between the four connecting rods 401.

[0068] For details, please refer to the appendix. Figure 4 The left side surface of the movable slider 402 is provided with four through holes, and each through hole is provided with a connecting rod 401. One end of the connecting rod 401 that passes through the movable slider 402 is a threaded end, and the other end is a large end. A first elastic element 403 is provided between the four connecting rods 401. The first elastic element 403 is generally a spring. The second card seat 301 is provided with a threaded hole. The movable slider 402 can be installed on the second card seat 301 through the connecting rods 401. When the connecting rods 401 are tightened, the spring is compressed, thereby pushing the movable card seat 3 towards the fixed card seat 1. It should be noted that a ratchet 404 is provided later, which can position the movable slider 402 to cooperate with the first elastic element 403 to play a pushing role.

[0069] Based on the above embodiments, the tensioning assembly 4 further includes a ratchet 404, a second elastic element 405, a nut 406, and a handle 407. The second elastic element 405 is sleeved on the ratchet 404. The nut 406 is threadedly connected to the second slider 302 and is used to install the ratchet 404 and the second elastic element 405 inside the second slider 302. The handle 407 is threadedly connected to the end of the ratchet 404 away from the second slider 302.

[0070] Specifically, the ratchet 404 is cylindrical in shape, with a boss at one end and an external thread at the other. The inner diameter of the second elastic element 405 matches the outer diameter of the ratchet 404, where the boss of the ratchet 404 is larger than the outer diameter of the second elastic element 405. During use, the second elastic element 405 applies force to the ratchet 404 through the boss. The movable slider 402 is square in shape, transitioning to a circle. A threaded hole at the circular position matches the external thread of the nut 406. The outer diameter of the handle 407 is smaller than the inner diameter of the nut 406. The end of the handle 407... The side threaded hole mates with the external thread on the end of the ratchet 404. The inner diameter of the end of the handle 407 is set to be consistent with the inner diameter of the ratchet 404. During assembly, the second elastic element 405 is sleeved on the outside of the ratchet 404. The nut 406 fixes the second elastic element 405 and the ratchet 404 inside the movable slider 402. The handle 407 is threaded to the external thread of the ratchet 404. Through the preload of the second elastic element 405, the ratchet 404 is pressed against the main scale 202. When the nut 406 is pulled, the second elastic element 405 can be compressed, so that the ratchet 404 moves away from the rack 203.

[0071] Based on the above embodiment, the guide rod ruler 2 includes a main ruler 202 and a rack 203. The rack 203 is disposed on the main ruler 202, and each tooth of the rack 203 has a right-angled trapezoidal structure.

[0072] Specifically, the structure of rack 203 can be found in the attached diagram. Figure 3The left toothed platform of the rack 203 is a 90° toothed platform and the right toothed platform is a 45° toothed platform. In use, the preload of the second elastic element 405 causes the ratchet 404 to stick to the rack 203. When the second card holder 301 moves towards the first card holder 101, the ratchet 404 sticks to the toothed platform contour of the main scale 202, so that the tensioning component 4 moves with the second card holder 301. When the tensioning assembly 4 is pushed towards the fixed bracket 1, the ratchet 404, under the force of the second elastic element 405, adheres to the rack 203 and falls into the rack gap along the 45° toothed edge of the rack 203. When the tensioning assembly 4 moves towards the fixed bracket 1, the end of the ratchet 404 contacts the 45° toothed edge of the rack 203 and can automatically rebound, moving to the next rack gap. When the movable bracket 3 moves away from the fixed bracket 1, the end of the ratchet 404 contacts the 90° toothed edge of the rack 203 and cannot move, thus playing a self-locking role. When the handle 407 is pulled, the second elastic element 405 can be compressed, and the ratchet 404 is moved away from the guide rod 2. When the ratchet 404 and the guide rod 2 are not in contact, the tensioning assembly 4 can move away from the fixed bracket 1 along with the movable bracket 3.

[0073] Based on the above embodiment, a pressure plate 5 is also included. The pressure plate 5 has a U-shaped structure and threaded holes. The pressure plate 5 is clamped to the fractured sample by bolts 306.

[0074] For details, please refer to the appendix. Figure 6 By applying preload using special bolts 306, the two pressure plates 5 are fixed onto the sample respectively, thus enabling the auxiliary measurement of elongation after fracture.

[0075] The tensile specimen elongation at break measuring device provided in this application is used as follows: By rotating the first screw knob 103 and the second screw knob 303, the two ends of the fractured specimen are fixed respectively. During the fixing process, the pressure plate 5 on the tensile specimen is aligned with the edges of the fixed bracket 1 and the movable bracket 3. The movable bracket 3 is moved to splice the fractured specimens together. When the movable bracket 3 is moved, the connecting rod contacts the continuous rack 203 through the action of the second elastic element 405 to achieve a one-way locking function. The tensioning component 4 is pushed to move 2-3 racks towards the fixed bracket 1, so that the first elastic element 403 is compressed, giving the two specimens an appropriate contact force and playing a tensioning role. When the two fractured specimens are in contact, the elongation at break of the specimen can be measured and calculated by checking the dimensions of the main scale 202 and the auxiliary scale 305.

[0076] Regarding the reading method: Take the value of the main scale 202, which is the closest division to the 0 mark of the vernier scale 305. Multiply the scale value of the vernier scale that is closest to the scale of the main scale 202 by 0.02 mm. Add the two values ​​together to get the fractured size of the sample.

[0077] In addition to the above-mentioned tensile specimen elongation at fracture measuring device, the present invention also provides an apparatus including the tensile specimen elongation at fracture measuring device disclosed in the above embodiments. The structure of other parts of the apparatus is described in the prior art and will not be repeated here.

[0078] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0079] The foregoing has provided a detailed description of the device and equipment for measuring the elongation at break of a tensile specimen provided by the present invention. Specific examples have been used to illustrate the principles and implementation methods of the invention. The descriptions of the embodiments above are merely for the purpose of helping to understand the method and core ideas of the present invention. It should be noted that those skilled in the art can make various improvements and modifications to the present invention without departing from its principles, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. A device for measuring the elongation at fracture of a tensile specimen, characterized in that, include: A fixed clamp (1) is used to hold the first part of the fractured specimen. The guide rod ruler (2) is a rod-shaped component. The guide rod ruler (2) is located on the fixed bracket (1). The surface of the guide rod ruler (2) is provided with a scale (201). A movable clamp (3) is provided on the guide rod (2). The movable clamp (3) is used to clamp the second part of the fractured specimen and slide along the guide rod (2). Tensioning component (4) is provided on the guide rod ruler (2). The tensioning component (4) abuts against the movable bracket (3) and is used to push the movable bracket (3) along the guide rod ruler (2) toward the fixed bracket (1).

2. The device for measuring the elongation at fracture of a tensile specimen according to claim 1, characterized in that, The fixed bracket (1) includes a first bracket (101), a first slider (102), a first screw knob (103), and a first anti-detachment clip (104). The first slider (102) is detachably connected to the first bracket (101) through the first screw knob (103). The first anti-detachment clip (104) is a U-shaped part, and the two ends of the first anti-detachment clip (104) are respectively located on the first bracket (101) and the first screw knob (103).

3. The device for measuring the elongation at fracture of a tensile specimen according to claim 2, characterized in that, The movable card holder (3) includes a second card holder (301), a second slider (302), a second screw knob (303), and a second anti-detachment clip (304). The second slider (302) is detachably connected to the second card holder (301) through the second screw knob (303). The second anti-detachment clip (304) is a U-shaped part, and the two ends of the second anti-detachment clip (304) are respectively located on the second card holder (301) and the second screw knob (303).

4. The device for measuring the elongation at fracture of a tensile specimen according to claim 3, characterized in that, The surface of the first card holder (101) facing the first slider (102) is an anti-slip surface, and the surface of the second card holder (301) facing the second slider (302) is an anti-slip surface.

5. The device for measuring the elongation at fracture of a tensile specimen according to claim 3, characterized in that, The movable bracket (3) also includes a secondary ruler (305), which is connected to the second bracket (301) by bolts (306).

6. The device for measuring the elongation at fracture of a tensile specimen according to claim 5, characterized in that, The tensioning assembly (4) includes a connecting rod (401), a movable slider (402), and a first elastic element (403). The movable slider (402) has four through holes. One end of the connecting rod (401) is a large end, and the other end is a threaded end. The second card holder (301) has four threaded holes. The connecting rod (401) passes through the through holes and is threadedly connected to the second card holder (301). The first elastic element (403) is disposed between the four connecting rods (401).

7. The device for measuring the elongation at fracture of a tensile specimen according to claim 6, characterized in that, The tensioning assembly (4) further includes a ratchet (404), a second elastic element (405), a nut (406), and a handle (407). The second elastic element (405) is sleeved on the ratchet (404). The nut (406) is threadedly connected to the second slider (302) and is used to install the ratchet (404) and the second elastic element (405) inside the second slider (302). The handle (407) is threadedly connected to one end of the ratchet (404) away from the second slider (302).

8. The device for measuring the elongation at fracture of a tensile specimen according to claim 7, characterized in that, The guide rod ruler (2) includes a main ruler (202) and a rack (203). The rack (203) is located on the main ruler (202), and each tooth of the rack (203) is a right-angled trapezoidal structure.

9. The apparatus for measuring the elongation at fracture of a tensile specimen according to any one of claims 5 to 8, characterized in that, It also includes a pressure plate (5), which has a U-shaped structure and threaded holes. The pressure plate (5) is clamped to the fractured specimen by the bolt (306).

10. An apparatus comprising a device for measuring the elongation at fracture of a tensile specimen, characterized in that, The tensile specimen elongation at fracture measuring device is the tensile specimen elongation at fracture measuring device as described in any one of claims 1 to 9.

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