Stretching tool for universal electronic testing machine
The novel gripping mechanism for electronic testing machines addresses the challenge of gripping small samples by using a stretch board and clamps with pads and protrusions to ensure stable and precise high-temperature tensile testing.
Patent Information
- Application Number
- CN202521170680.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-06-10
- Publication Date
- 2025-07-15
- Estimated Expiration
- 2035-06-10
AI Technical Summary
The existing universal electronic testing machine cannot effectively clamp small-sized samples, especially metal ingots, in high-temperature tensile experiments, making the experiment difficult to carry out.
A tensile tooling consisting of a pair-arranged fixing assembly consisting of a tensile plate, clamp and pad, providing friction and support through the clamping block and pad, adapting to the clamping ends of small-sized samples to avoid stress concentration and thermal expansion.
The stable clamping of small-sized samples is achieved, ensuring the smooth progress of high-temperature tensile experiments, and improving the accuracy and reliability of experimental data.
Smart Images
Figure CN223107471U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the field of mechanical design, and in particular relates to a stretching tool used for a universal electronic testing machine. Background Art
[0002] Universal electronic testing machine is a kind of equipment widely used in mechanical property testing of materials, which can perform various mechanical property tests such as tension, compression, bending, etc. In the field of materials science, it is particularly important to test the performance of materials under different temperature conditions, especially under conditions above room temperature (i.e. high temperature environment), the mechanical properties of materials will change, so high temperature tensile test becomes an important means to evaluate the high temperature performance of materials.
[0003] When conducting high-temperature tensile or compression tests, the existing universal electronic testing machines usually first connect one end of the upper fixture to the sample using a pin, and then fix the other end to the universal electronic testing machine with a threaded connection (the installation method of the lower fixture is the same as the upper fixture). Specifically, first, when designing the upper fixture, it is necessary to process a through hole and a groove of a certain depth on its side, and then it is also necessary to process a sample hole matching the through hole above the sample. After placing the sample in the groove and aligning the through hole and the sample hole, insert the pin to achieve the purpose of installing the sample. After the sample is installed, the heating furnace that is matched with the universal electronic testing machine is then wrapped around the tooling and the entire sample to heat it. After the temperature rises to the set temperature, the universal electronic testing machine is turned on to carry out the tensile test.
[0004] However, there is a problem with the above clamping method when conducting high temperature experiments. Because drilling is involved before stretching, it is possible to process a hole that matches the diameter of the pin for large-sized tensile samples. However, for small-sized samples, since the clamping end itself is very small, or even the overall area is smaller than the cross-sectional area of the pin, it is obviously impossible to achieve clamping with this installation method of the prior art. For example, the metal ingot prepared using vacuum arc melting equipment has a total ingot size of about 30 mm, and due to the surface tension of the metal during the melting process, the surface of the ingot will also present an irregular shape. In this case, the clamping end of the cut tensile sample is much smaller than the cross-sectional area of the pin, and it is impossible to process a through hole that matches the diameter of the pin. If the size of the pin is reduced to match the size of the sample clamping end according to the design ideas of the prior art, the pin may break during the stretching process, or the sample clamping end may break during the stretching process due to the opening of the hole. Therefore, the clamping method of the prior art cannot be used for small-sized samples.
[0005] In view of the above-mentioned technical difficulties, the current market is in urgent need of a stretching tooling designed specifically for small-size samples, which can not only fill the current technical gap, but also greatly expand the application scope of universal electronic testing machines. Utility Model Content
[0006] In view of the deficiencies of the prior art, the utility model aims to solve the technical problem in the prior art that small samples cannot be effectively clamped during tensile testing due to their own small size.
[0007] In order to achieve the above-mentioned object, the scheme of the utility model is to provide a stretching tool for a universal electronic testing machine, the stretching tool comprising a fixed assembly arranged in pairs, the fixed assembly comprising a stretching plate and clamping blocks symmetrically arranged on both sides of the stretching plate, wherein:
[0008] One end of the stretching plate is connected to the fixture of the universal electronic testing machine, and the other end is provided with a first through hole that matches the shape of the clamping end of the sample, the depth of the first through hole is greater than the thickness of the sample, and the clamping end of the sample is placed in the first through hole;
[0009] The clamp block is located at a position corresponding to the clamping end of the sample to prevent the sample from escaping from the stretching plate.
[0010] Furthermore, the fixing assembly also includes pads symmetrically arranged on both sides of the stretching plate, the pads are located between the clamping block and the sample, the sum of the thickness of the two clamping blocks and the thickness of the sample is greater than the depth of the first through hole, and the clamping block provides friction for the sample during stretching by pressing the pads.
[0011] Furthermore, the clamping block is provided with a first groove, and the cushion block is located in the first groove.
[0012] Furthermore, a plurality of first protrusions are evenly distributed on the surface of the pad.
[0013] Furthermore, the stretching plate is symmetrically provided with two straight slots, the height of the straight slots is greater than the height of the clamping block, and the clamping block is provided with a second through hole at a position corresponding to the straight slot, and the bolts pass through the second through hole and the straight slots in sequence to install the clamping block on both sides of the stretching plate, and when the sample is subjected to tension, the side surface of the bolt fits with the side of the straight slot close to the sample.
[0014] Furthermore, the first through hole is provided with a transition arc at a position corresponding to the rounded corner transition of the sample, and the radius of the transition arc is smaller than the radius of the rounded corner transition of the sample.
[0015] Furthermore, the height of the first through hole is greater than the height of the sample clamping end, and the first through hole is symmetrically provided with a plurality of second protrusions along the width direction, and the end surface distance of the second protrusions on both sides is equal to the width of the sample.
[0016] Furthermore, third protrusions are symmetrically arranged on both sides of the stretching plate. During the stretching process of the sample, the end face of the third protrusion fits against one side face of the clamping block.
[0017] The utility model has the following advantages:
[0018] 1. A stretching tooling is provided. When conducting a small-sample stretching experiment, the fixture of the universal electronic testing machine does not directly clamp the small sample. Instead, by connecting the stretching tooling of this application, the small-sized sample is indirectly clamped. Through structural design, the stretching tooling of this application can meet the clamping requirements of small-sized samples.
[0019] 2. During the stretching process, the first through-hole adapted to the shape of the clamping end of the sample can provide a supporting force for the sample. Also, since the sum of the thicknesses of the two clamping blocks and the thickness of the sample is greater than the depth of the first through-hole, this design method can provide a frictional force for the sample when the sample is stretched. The combined action of the two forces can enable the sample to smoothly obtain stretching data.
[0020] 3. The clamping block is provided with a first groove. Placing the cushion block in the first groove can, on the one hand, facilitate the clamping of the stretching tooling. On the other hand, the relative position between the cushion block and the clamping block is converted from the original frictional force into a supporting force and a frictional force. Therefore, the relative positions of the two parts will not change, and the stretching tooling is more stable during the testing process.
[0021] 4. A number of first protrusions are evenly distributed on the surface of the cushion block. During the heating stage and the high-temperature stretching stage, since the material has better plasticity at high temperatures and undergoes slight plastic deformation when heated, a part of the first protrusions will be embedded in the sample. Therefore, at this time, there are not only frictional forces but also supporting forces between the cushion block and the sample.
[0022] 5. The transition arc radius at the corresponding position of the first through-hole at the fillet transition of the sample is smaller than the radius of the fillet transition of the sample. This design method can effectively avoid the occurrence of stress concentration phenomena during the high-temperature stretching of the sample. Because stress concentration at the fillet transition is likely to cause the fracture of the sample not to be at the parallel section of the sample, which will affect the accuracy of the high-temperature stretching data.
[0023] 6. The height of the first through-hole is made greater than the height of the clamping end of the sample, so that even if the sample undergoes thermal expansion during the heating stage, it can prevent the sample from bending when contacting the stretching plate in the height direction. The first through-hole is symmetrically provided with a number of second protrusions along the inside of the hole in the width direction, and the distance between the end faces of the second protrusions on both sides is equal to the width of the sample. This design method can ensure that the clamping ends at both ends of the sample are in the vertical direction, avoiding the sample from tilting during the high-temperature stretching process. Brief Description of the Drawings
[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for the description of the present utility model will be briefly introduced below. Obviously, the drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts:
[0025] Figure 1 It is a schematic diagram of the installation of the sample during the high-temperature tensile test of the present application;
[0026] Figure 2 It is a schematic diagram of the tensile tooling of the first embodiment of the present utility model;
[0027] Figure 3 It is a schematic diagram of the tensile tooling of the second embodiment of the present utility model;
[0028] Figure 4 In the present utility model Figure 3 Cross-sectional view of the tensile tooling;
[0029] Figure 5 In the present utility model Figure 4 Partial enlarged view at position B;
[0030] Figure 6 It is an assembly schematic diagram of the clamping block and the cushion block according to the second embodiment of the present utility model;
[0031] Figure 7 It is a schematic diagram of the structure of the tensile plate according to the second embodiment of the present utility model;
[0032] Figure 8 It is an assembly schematic diagram of the tensile tooling of the third embodiment of the present utility model;
[0033] Figure 9 In the present utility model Figure 8 Cross-sectional view of the tensile tooling;
[0034] Figure 10 In the present utility model Figure 9 Partial enlarged view at position C.
[0035] Explanation of Reference Numerals:
[0036] 10: Clamp; 101: Through hole; 20: Plug pin; 30: Sample; 40: Tensile plate; 401: Connection hole; 402: First through hole; 403: Second protrusion; 404: Transition arc; 405: Straight notch; 406: Third protrusion; 50: Clamping block; 501: First groove; 502: Second through hole; 60: Cushion block; 601: First protrusion; 70: Bolt.
[0037] The following specific embodiments will further illustrate the present utility model in conjunction with the above-mentioned drawings. Specific Embodiments
[0038] In order to make the objectives, features and advantages of the present utility model more obvious and understandable, the specific embodiments of the present utility model will be described in detail below in conjunction with the drawings. First of all, it should be noted that the stretching tooling in the embodiments of the present application can be applied to mechanical testing equipment or other equipment, and the present application does not make any limitations in this regard. Several embodiments of the present utility model are given in the drawings. However, the present utility model can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present utility model more thorough and comprehensive.
[0039] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "left", "right", "up", "down" and similar expressions used herein are only for the purpose of illustration and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation on the present utility model.
[0040] Embodiment 1
[0041] As Figure 1 shown is a schematic diagram of the installation of sample 30 during the high-temperature tensile test of the present application. As can be seen from Figure 1 , the sample 30 is fixed in the stretching tooling of the present application, and the stretching tooling is installed in the fixture 10 of the universal electronic testing machine. This design plays an indirect clamping role, enabling the universal electronic testing machine to also perform high-temperature tensile tests on small-sized samples 30.
[0042] The stretching tooling described in this embodiment is as Figure 2 shown. As can be seen from Figure 2 , the stretching tooling includes a pair of fixedly arranged fixing components. The fixing components include a stretching plate 40. One end of the stretching plate 40 is provided with a connection hole 401. After the pin 20 sequentially passes through the through hole 101 on the fixture 10 and the connection hole 401, the stretching plate 40 can be installed on the fixture 10 of the universal electronic testing machine at this time.
[0043] At the other end of the stretching plate 40, there is a first through hole 402 whose shape is adapted to the clamping end of the sample 30. The depth of the first through hole 402 is greater than the thickness of the sample 30, and the clamping end of the sample 30 is placed inside the first through hole 402. When the high-temperature tensile test of the sample 30 is carried out, only the clamping end of the sample 30 needs to be placed inside the first through hole 402, and then the universal electronic testing machine is turned on. As the strokes of the two fixtures 10 of the universal electronic testing machine become farther and farther apart, other materials near the first through hole 402 will provide a supporting force to the fillet transition of the sample 30 to ensure the smooth progress of the test. Further, in order to facilitate the installation of the stretching tooling before the experiment and to prevent the sample 30 from slipping out of the first through hole 402 after deflection during the experiment, the fixing assembly further includes clamping blocks 50 symmetrically arranged on both sides of the stretching plate 40. The clamping blocks 50 are located at the corresponding positions of the clamping end of the sample 30 to prevent the sample 30 from slipping out of the stretching plate 40.
[0044] In order to prevent the stress concentration phenomenon during the high-temperature tensile process and affect the accuracy of the experimental data, a transition arc 404 is provided at the corresponding position of the fillet transition of the sample 30 in the first through hole 402, and the radius of the transition arc 404 is smaller than the radius of the fillet transition of the sample 30. In addition, since the metal will expand in volume during heating, in order to avoid the sample 30 from colliding with the stretching plate 40 after thermal expansion and causing the sample 30 to bend, the height of the first through hole 402 is greater than the height of the clamping end of the sample 30. Furthermore, a number of second protrusions 403 are symmetrically arranged along the inside of the first through hole 402 in the width direction, and the end face distance between the two second protrusions 403 on both sides is equal to the width of the sample 30. In this way, when the tensile test of the sample 30 is carried out, it can be ensured that both ends of the stretched sample 30 are in the vertical direction. Without the second protrusions 403, since the size of the first through hole 402 is larger than the size of the sample 30, there is a certain moving space for the clamping end of the sample 30 inside the first through hole 402. When the moving directions of both ends of the sample 30 are inconsistent, the sample 30 may be in an inclined position during high-temperature tensile, affecting the experimental results. And the position near the second protrusions 403 can provide a deformation space for the volume expansion of the sample 30 in the width direction.
[0045] Therefore, the features of Embodiment 1 include: 1. A stretching tooling is provided. When conducting a high-temperature tensile test on a small sample 30, the clamp 10 of the universal electronic testing machine does not directly clamp the small sample 30, but indirectly clamps the small-sized sample 30 by connecting the stretching tooling of this embodiment. Through structural design, the stretching tooling of this application can meet the clamping requirements of the small-sized sample 30. In addition, the clamping blocks 50 symmetrically arranged on both sides of the stretching plate 40 can effectively prevent the sample 30 from slipping out of the stretching plate 40, ensuring the smooth progress of the experiment. 2. The first through hole 402 is provided with a transition arc 404 whose size is smaller than the radius of the rounded transition of the sample 30, which can effectively avoid the stress concentration phenomenon at the transition of the sample 30 during the high-temperature tensile process and ensure the accuracy of the experimental data. 3. The setting of the second protrusion 403 can ensure that both ends of the stretched sample 30 are in the vertical direction. And the position near the second protrusion 403 can provide a deformation space for the volume expansion of the sample 30 in the width direction.
[0046] Embodiment 2
[0047] Embodiment 2 is generally the same as Embodiment 1 in structure, except that the fixing component of Embodiment 2 further includes cushion blocks 60 symmetrically arranged on both sides of the stretching plate 40. As Figure 3 shown ( Figure 3 the corresponding cross-sectional view is as Figure 4 shown, Figure 5 for Figure 4 the partial enlarged view at B in
[0048] ), the cushion blocks 60 are located between the clamping blocks 50 and the sample 30, and the sum of the thicknesses of the two clamping blocks 50 and the thickness of the sample 30 is greater than the depth of the first through hole 402. In this design, the clamping blocks 50 can not only prevent the sample 30 from slipping out of the stretching plate 40, but also provide frictional force for the sample 30 during stretching by pressing the cushion blocks 60. Figure 6 shown, the clamping block 50 is provided with a first groove 501, and the cushion block 60 is located in the first groove 501. This not only improves the efficiency before the high-temperature tensile test, but also, since there is no relative movement between the cushion block 60 and the first groove 501 during the high-temperature tensile process of the sample 30, the clamping block 50 can continuously press the cushion block 60 in a suitable position to provide frictional force for the sample 30 during stretching.
[0049] In order to further improve the clamping force on the clamping end of the sample 30, a number of first protrusions 601 are evenly distributed on the surface of the cushion block 60. Its function during the high-temperature tensile process is as Figure 5As shown, before the high-temperature furnace is heated up, one side of the clamping block 50 and the spacer block 60 is in a state of keeping in contact. Similarly, one side of the spacer block 60 and the sample 30 is also in a state of keeping in contact. However, through heating, all parts including the sample 30 will undergo volume expansion, and the plasticity of all parts and the sample 30 will increase at high temperatures. Therefore, a part of the dimension of the first protrusion 601 in the height direction will surely be embedded into the internal part of the part in contact therewith, which makes the frictional force between the spacer block 60 and the sample 30 become the coexistence of frictional force and supporting force. Those skilled in the art know that during the stretching process of the sample 30, only the plastic deformation amount of the parallel section of the sample 30 needs to be calculated. If the clamping end of the sample 30 also undergoes plastic deformation, the obtained tensile data of the sample 30 cannot well reflect the plasticity of the sample 30. In the actual high-temperature stretching process of this embodiment, when the clamping end of the sample 30 is under force and has a tendency to undergo plastic deformation, the spacer block 60 can provide frictional force and supporting force to hinder this tendency, making the tensile data more accurate.
[0050] In addition, during the testing process by those skilled in the art, in order to obtain the strain data of the parallel section of the sample 30, a three-dimensional full-field strain measurement system is usually equipped, which combines the digital image correlation method (DIC) and binocular stereo vision technology. By tracking the speckle image of the sample 30, the dynamic measurement of the three-dimensional coordinates, displacement and strain of the sample 30 during the deformation process is realized. For the small-sized sample 30, since the area of the parallel section itself is small, therefore, the parallel section part should be exposed as much as possible so that the light source of the three-dimensional full-field strain measurement system can irradiate and capture the relevant strain data. In this embodiment, when the sample 30 is subjected to high-temperature stretching, the support force for the sample 30 is mainly provided by the transition arc 404 of the first through hole 402, and the support force and frictional force for the sample 30 are provided by the spacer block 60. However, in the prior art, the light source of the three-dimensional full-field strain measurement system is divergent. If there are other parts near the parallel section of the sample 30, it will surely cause a shadow in the parallel section of the sample 30, ultimately affecting the acquisition of strain data. Figure 7 The stretching plate 40 of this embodiment is shown. In order to ensure sufficient strength when the transition arc 404 of the first through hole 402 provides a support force for the sample 30, a part of the dimension extends vertically downward from the transition arc 404. Combining the above description, it is easy to know that this part of the structure is a structure parallel to the parallel section of the sample 30. Therefore, when the divergent light source irradiates here, it will surely affect the observation of the strain of this part of the parallel section. Therefore, the smaller this part of the dimension is, the larger the area where the sample 30 can obtain strain data is. However, the smaller the dimension is, the more it will affect the strength here, which further reflects the importance of the support force and frictional force of the spacer block 60 for the sample 30.
[0051] Furthermore, it can be seen from Figure 7 that two straight notches 405 are symmetrically provided on the stretching plate 40, and the height of the straight notch 405 is greater than the height of the clamping block 50. The clamping block 50 is provided with a second through hole 502 at a position corresponding to the straight notch 405, and the bolt 70 passes through the second through hole 502 and the straight notch 405 in sequence to install the clamping block 50 on both sides of the stretching plate 40. This enables the clamping block 50 to have a sliding space when the relevant parts expand in volume due to heat, avoiding hard contact between the parts. The schematic diagram after assembly is as shown in Figure 3 shown.
[0052] It should be noted that when the clamping end of the sample 30 has a tendency to move downward during the high-temperature stretching process, the bolt 70, the spacer 60, and the clamping block 50 will also have a tendency to move downward at the beginning like the clamping end. However, when the sample 30 is subjected to a tensile force, the side surface of the bolt 70 fits against the side of the straight notch 405 close to the sample 30. The straight notch 405 will provide a supporting force to the bolt 70 to prevent the bolt 70 from continuing to move downward. Through the force conduction and the structural design of the parts, finally, the spacer 60 has both frictional force and supporting force on the clamping end of the sample 30.
[0053] Therefore, the features of the second embodiment include: 1. The clamping block 50 can not only prevent the sample 30 from coming out of the stretching plate 40, but also provide frictional force for the sample 30 during stretching by pressing the spacer 60. 2. The clamping block 50 is provided with a first groove 501, and the spacer 60 is located in the first groove 501. This not only improves the efficiency before the high-temperature stretching experiment, but also, since the spacer 60 and the first groove 501 do not have relative movement during the high-temperature stretching process of the sample 30, the clamping block 50 can continuously press the spacer 60 at a suitable position to provide frictional force for the sample 30 during stretching. 3. The design of the first protrusion 601 makes clever use of the effect that the material expands in volume when heated at high temperature, enabling the spacer 60 to not only provide frictional force for the sample 30, but also provide supporting force for the sample 30. 4. The design of the straight notch 405 not only enables the clamping block 50 to have a sliding space when the relevant parts expand in volume due to heat, avoiding hard contact between the parts, but also, when the sample 30 is subjected to a tensile force, the side surface of the bolt 70 fits against the side of the straight notch 405 close to the sample 30. The straight notch 405 will provide a supporting force to the bolt 70 to prevent the bolt 70 from continuing to move downward. Through the force conduction and the structural design of the parts, finally, the spacer 60 has both frictional force and supporting force on the clamping end of the sample 30.
[0054] Embodiment 3
[0055] Embodiment 3 is generally the same in structure as Embodiment 2, the difference being that on both sides of the stretching plate 40 of Embodiment 3, third protrusions 406 are symmetrically arranged (as Figure 8 shown). Figure 9 For Figure 8 the corresponding cross-sectional view, it can be clearly seen from Figure 9 that during the stretching process of the sample 30, the end face of the third protrusion 406 is in contact with one side face of the clamping block 50 (the partial enlarged view at C in Figure 9 is as shown in Figure 10 ).
[0056] As described in Embodiment 2, in Embodiment 2, since the supporting force and frictional force provided by the cushion block 60 to the sample 30 are conducted after the bolt 70 is subjected to the supporting force of the straight groove 405, the stress area of the bolt 70 is small. After being stressed at high temperature for a long time, it is very likely that the threads of the bolt 70 will slip, affecting the use. In addition, during installation, since the bolt 70 will shake, without a supporting structure, it is very difficult to ensure the coaxiality between the bolt 70 and the second through hole 502. Through the arrangement of the third protrusion 406, at this time, the supporting force is first transmitted from the third protrusion 406 to the clamping block 50. Since the clamping blocks 50 are distributed on both sides of the stretching plate 40, although the bolt 70 is still stressed, it is then provided by the clamping blocks 50 on both sides, and the stress is more uniform. At the same time, the arrangement of the third protrusion 406 can also provide support and a reference during the assembly process of the stretching tooling.
[0057] In summary, the structure of the present utility model is simple, and the assembly and usage methods are simple. Without changing the existing fixture 10 of the universal electronic testing machine, by indirectly clamping the small sample 30, the problem in the prior art that there is no matching fixture 10 for the small-sized sample 30 during high-temperature tensile testing, making the experiment difficult to carry out, is solved.
[0058] Those skilled in the art can understand that although some embodiments herein include certain features included in other embodiments rather than other features, the combination of the features of different embodiments means that it is within the scope of this application and forms different embodiments. For example, in the claims, any one of the claimed embodiments can be used in any combination.
[0059] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the present application.
Claims
1. A tensile tooling for a universal electronic testing machine, characterized in that, The stretching tooling includes fixed components arranged in pairs, and the fixed components include a stretching plate and clamping blocks symmetrically arranged on both sides of the stretching plate, wherein: One end of the stretching plate is connected to the fixture of the universal electronic testing machine, and the other end is provided with a first through hole that matches the shape of the clamping end of the sample, the depth of the first through hole is greater than the thickness of the sample, and the clamping end of the sample is placed in the first through hole; The clamp block is located at a position corresponding to the clamping end of the sample to prevent the sample from escaping from the stretching plate.
2. The tensile tooling for a universal electronic testing machine according to claim 1, characterized in that, The fixing assembly also includes pads symmetrically arranged on both sides of the stretching plate, the pads are located between the clamping block and the sample, the sum of the thickness of the two clamping blocks and the thickness of the sample is greater than the depth of the first through hole, and the clamping block provides friction for the sample during stretching by pressing the pads.
3. The tensile tooling for a universal electronic testing machine according to claim 2, characterized in that, The clamping block is provided with a first groove, and the cushion block is located in the first groove.
4. The tensile tooling for a universal electronic testing machine according to claim 3, characterized in that, A plurality of first protrusions are evenly distributed on the surface of the pad.
5. The tensile tooling for a universal electronic testing machine according to claim 2, characterized in that, The stretching plate is symmetrically provided with two straight slots, the height of the straight slots is greater than the height of the clamping block, and the clamping block is provided with a second through hole at a position corresponding to the straight slot. Bolts pass through the second through hole and the straight slots in sequence to install the clamping block on both sides of the stretching plate. When the sample is subjected to tension, the side surface of the bolt fits with the side of the straight slot close to the sample.
6. The tensile tooling for a universal electronic testing machine according to claim 1, characterized in that, The first through hole is provided with a transition arc at a position corresponding to the rounded corner transition of the sample, and the radius of the transition arc is smaller than the radius of the rounded corner transition of the sample.
7. The tensile tooling for a universal electronic testing machine according to claim 1, characterized in that, The height of the first through hole is greater than the height of the sample clamping end. The first through hole is symmetrically provided with a plurality of second protrusions in the hole in the width direction. The end surface distance of the second protrusions on both sides is equal to the width of the sample.
8. The tensile tooling for a universal electronic testing machine according to claim 1, characterized in that, The third protrusions are symmetrically arranged on both sides of the stretching plate. During the stretching process of the sample, the end faces of the third protrusions are in contact with one side face of the clamping block.