A shear test device

Abstract

The utility model relates to metal material detection technical field, aims at solving the problem that the sample of many specifications or the sample of many sizes cannot be detected in prior art, provides a kind of shearing test device, including pressure head and base;Pressure head has upper connecting rod, and the middle part has upper bolt hole, and the bottom of upper connecting rod has upper connecting plate, and the lower side of upper connecting plate has support rod, and the bottom end of support rod has pressure block;The base has first support plate and second support plate, and the first support plate and second support plate heart are respectively detachable first sample sleeve and second sample sleeve in upper position, and its axis has first sample hole;The bottom of first support plate and second support plate is connected with lower connecting plate, and the bottom of lower connecting plate is connected with lower connecting rod, and the middle part of lower connecting rod has lower bolt hole;Two sample sleeves have gap cooperation's shearing ring;The axis of shearing ring has second sample hole.The utility model has the beneficial effect that the sample of many specifications or the sample of many sizes can be detected.

Description

Technical Field

[0001] This utility model relates to the field of metal material testing technology, and more specifically, to a shear test device. Background Technology

[0002] Shear testing is one of the basic testing methods for detecting the mechanical properties of materials. It tests the resistance of materials to shear force and is mainly used to test parts and materials that bear shear loads, such as rivets, pins, and bolts. Typically, shear testing is performed on a universal testing machine. Specifically, the shear testing device is installed on the universal testing machine, and the sample to be tested is installed on the shear testing device for shear testing. The performance of the shear testing fixture is related to the ease of operation and accuracy of the shear test.

[0003] In the prior art, a shear testing device is often only used to test samples of one specification (such as the same diameter), which makes it difficult to test samples of multiple specifications, such as samples of various sizes. To solve this problem, this utility model provides a new shear testing device to meet the testing needs of samples of different sizes. Utility Model Content

[0004] The present invention aims to provide a shear testing device to solve the problem that the prior art cannot test samples of multiple specifications or multiple sizes.

[0005] The embodiments of this utility model are implemented as follows: This utility model provides a shear testing device, which includes an indenter and a base; The aforementioned pressure head has an upper connecting rod located at the top of the pressure head, with an upper pin hole in its middle. The bottom of the upper connecting rod has an upper connecting plate, and a support rod is connected below the upper connecting plate. The bottom end of the support rod has a pressure block, which is semi-circular. The base has a first support plate and a second support plate that are parallel to each other and spaced apart. The first support plate and the second support plate are respectively provided with a detachable first sample sleeve and a second sample sleeve at the upper part of their center. The first sample sleeve and the second sample sleeve are both provided with a coaxial first sample hole at their axis. The inner ends of the first sample sleeve and the second sample sleeve are parallel to the inner sides of the first support plate and the second support plate, respectively. The bottom of the first support plate and the second support plate are vertically connected to a lower connecting plate, and a lower connecting rod is connected to the center of the bottom of the lower connecting plate. The lower connecting rod has a lower pin hole in the middle. A shearing ring with clearance fit is provided between the first sample sleeve and the second sample sleeve. The axis of the shearing ring has a second sample hole that is adapted to the first sample hole and allows the sample to pass through. The outer wall of the shear ring is adapted to the inner arc surface of the pressure block.

[0006] In use, the device is first installed on the universal testing machine through the upper pin hole of the upper connecting rod and the lower pin hole of the lower connecting rod. The first and second sample sleeves, which are compatible with the sample to be tested, are then installed on the first and second support plates, respectively. The shear ring with the matching second sample hole is then placed between the two sample sleeves. The sample is then passed through the first sample hole of the first sample sleeve, the second sample hole of the shear ring, and the first sample hole of the second sample sleeve in sequence. The universal testing machine is then started to make the pressure head descend. The inner arc surface of the pressure block is pressed against the outer wall of the shear ring to apply pressure, thereby realizing the shear test on the sample.

[0007] The shear testing device disclosed in this embodiment adopts a combination design of a detachable first sample sleeve, a second sample sleeve, and a shear ring with an adaptable second sample hole. This allows for flexible replacement of corresponding components to adapt to test samples of different sizes and shapes, meeting the shear testing needs of samples of various specifications. Simultaneously, stable installation with a universal testing machine is achieved through the upper connecting rod, lower connecting rod, upper pin hole, and lower pin hole. Combined with the precise fit between the inner arc surface of the pressure block and the outer wall of the shear ring, the stability of the test force can be ensured by the precise control of the testing machine. Furthermore, the robust connection structure and reasonable layout design between the components improve the ease of operation and effectively ensure the accuracy of the shear test results, facilitating widespread application. Therefore, this shear testing device has the beneficial effect of being able to test samples of various specifications or sizes.

[0008] Optionally, both the first sample sleeve and the second sample sleeve are T-shaped structures with several evenly distributed threaded holes on their outer circumferential surfaces. The first sample sleeve and the second sample sleeve are detachably connected to the first support plate or the second support plate by bolts passing through the threaded holes.

[0009] With this configuration, the T-shaped structure provides stable support for the first and second sample sleeves, preventing displacement during the test and ensuring the accuracy of sample installation. The detachable design of the first and second sample sleeves allows for easy replacement with different sample hole sizes, meeting the shear test requirements for various sample specifications and improving the versatility and ease of operation of the device.

[0010] Optionally, the shape of the upper connecting rod and the lower connecting rod is rectangular, square or cylindrical.

[0011] This configuration allows the upper and lower connecting rods to be compatible with different types of mounting interfaces on the universal testing machine, avoiding the problem of limited device compatibility due to the single shape of the testing machine's interface, and broadening the compatibility range of the device with universal testing machines of different specifications.

[0012] Optionally, the shape of the upper and lower pin holes can be square or round.

[0013] This design allows for the adaptation of pins of different shapes, meeting the diverse needs of universal testing machines and devices for pin shapes, avoiding insufficient connection compatibility due to a single pin shape, and broadening the connection compatibility range between the device and the testing machine.

[0014] Optionally, the first sample hole of the first sample sleeve and the second sample sleeve and the second sample hole of the shear ring are both square, circular or trapezoidal in shape.

[0015] This configuration allows the first and second sample holes to be adapted to test samples with different cross-sectional shapes, such as square, circular, and trapezoidal, avoiding the problem of limited applicability of the device due to the single cross-sectional shape of the sample. It meets the shear test requirements of multiple specifications and types of samples, and significantly improves the versatility of the device.

[0016] Optionally, the size of the upper connecting plate is larger than the size of the upper connecting rod and the support rod, and the size of the lower connecting plate is larger than the size of the support plate and the lower connecting rod.

[0017] This design, on the one hand, increases the contact area of ​​the various parts of the pressure head, disperses the shear force transmitted during the test, avoids damage to the connection parts due to local stress concentration, and improves the overall structural stability of the pressure head; on the other hand, the connections of the various parts of the base can ensure the overall structural rigidity of the base, thereby ensuring that the entire shear test device remains stable during the test, reducing the impact of device deformation on test accuracy, and balancing structural strength and test accuracy.

[0018] Optionally: A sample slide is provided between the first support plate and the second support plate, the sample slide is close to the lower connecting plate, and the sample slide is higher in the middle and lower on both sides.

[0019] This design allows the sample slide to accurately catch the sample and shear ring that fall after the test, and the inclined structure with a high center and low sides guides them to automatically detach from the device, simplifying the cleaning process, improving the convenience and efficiency of operation, and preventing damage to components from collisions.

[0020] Optionally, the connection method of the above-mentioned upper connecting rod, the above-mentioned upper connecting plate, the above-mentioned support rod and the above-mentioned pressure block is welding or bolt connection.

[0021] This setup ensures that the welded connections are secure enough to withstand the test stress, while the bolted connections facilitate component disassembly and maintenance. Both methods balance structural stability and operational flexibility, adapting to different usage requirements.

[0022] Optionally, the connection method of the first support plate, the second support plate, the lower connecting plate and the lower connecting rod is welding or bolt connection.

[0023] This configuration ensures that the welding of the first support plate, the second support plate, the lower connecting plate, and the lower connecting rod is stable enough to withstand the test load, while the bolt connection facilitates the disassembly and maintenance of the components. Both methods balance the stability of the base structure and the flexibility of operation, adapting to different usage needs.

[0024] Optionally, the outer surface of the shear ring is provided with a wear-resistant coating.

[0025] This configuration, by providing a wear-resistant coating of nitrided or chromium-plated layer on the outer surface of the shear ring, can enhance the wear resistance of the outer surface of the shear ring, extend its service life, and ensure the stability of the test process.

[0026] Optionally, the surface of the sample slide is coated with polytetrafluoroethylene, and the tilt angle of the two sides of the sample slide is 15° to 30°.

[0027] This design reduces friction between the sample and the sample slide, allowing it to slide smoothly while ensuring the durability of the sample slide and improving post-test cleaning efficiency.

[0028] Optionally, the inner arc surface of the pressure block that contacts the shear ring is provided with a buffer pad, which is a rubber pad or a silicone pad.

[0029] This configuration helps to mitigate the impact when the two parts come into contact, preventing damage from collisions and ensuring the stability of the test.

[0030] In summary, the shear testing device disclosed in this utility model has the beneficial effect of being able to test samples of multiple specifications or multiple sizes. Attached Figure Description

[0031] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 This is a schematic diagram of the structure of a shear testing device according to an embodiment of the present invention; Figure 2 This is a side view of the base in an embodiment of the present utility model; Figure 3 This is a schematic diagram of the structure of the first sample sleeve and the second sample sleeve in the embodiments of this utility model; Figure 4 This is a front view of the shear ring in an embodiment of the present invention; Figure 5 This is a top view of the shear ring in an embodiment of the present invention.

[0033] Icons: 1-Indenter, 2-Base, 3-Upper connecting rod, 4-Upper pin hole, 5-Upper connecting plate, 6-Support rod, 7-Pressure block, 8-First support plate, 9-Second support plate, 10-First sample sleeve, 11-Second sample sleeve, 12-First sample hole, 13-Lower connecting plate, 14-Lower connecting rod, 15-Lower pin hole, 16-Shear ring, 17-Second sample hole, 18-Threaded hole, 19-Sample slide. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0035] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0036] Example See Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 This embodiment proposes a shear test device, including an indenter 1 and a base 2; The pressure head 1 has an upper connecting rod 3, which is located at the top of the pressure head 1. The upper connecting rod 3 has an upper pin hole 4 in its middle. The bottom of the upper connecting rod 3 has an upper connecting plate 5. A support rod 6 is connected below the upper connecting plate 5. A pressure block 7 is provided at the bottom of the support rod 6. The pressure block 7 is semi-circular and has a space in the middle that matches the size of the shearing ring 16. The base 2 has a first support plate 8 and a second support plate 9 that are parallel to each other and spaced apart. The first support plate 8 and the second support plate 9 are respectively provided with a detachable first sample sleeve 10 and a second sample sleeve 11 at the upper part of their centers. The first sample sleeve 10 and the second sample sleeve 11 are both provided with a coaxial first sample hole 12 at their axial centers. The inner ends of the first sample sleeve 10 and the second sample sleeve 11 are parallel to the inner sides of the first support plate 8 and the second support plate 9, respectively. The bottom of the first support plate 8 and the second support plate 9 are vertically connected to the lower connecting plate 13. The bottom center of the lower connecting plate 13 is connected to the lower connecting rod 14. The lower connecting rod 14 has a lower pin hole 15 in the middle. A shearing ring 16 with clearance fit is provided between the first sample sleeve 10 and the second sample sleeve 11. The axis of the shearing ring 16 has a second sample hole 17 that is adapted to the first sample hole 12 and allows the sample to pass through. The outer wall of the shear ring 16 is adapted to the inner arc surface of the pressure block 7.

[0037] In use, the device is first installed on the universal testing machine through the upper pin hole 4 of the upper connecting rod 3 and the lower pin hole 15 of the lower connecting rod 14. The first sample sleeve 10 and the second sample sleeve 11, which are compatible with the sample to be tested, are installed on the first support plate 8 and the second support plate 9, respectively. Then, the shear ring 16 with the compatible second sample hole 17 is placed between the two sample sleeves. The sample is then passed through the first sample hole 12 of the first sample sleeve 10, the second sample hole 17 of the shear ring 16, and the first sample hole 12 of the second sample sleeve 11 in sequence. The universal testing machine is started so that the pressure head 1 moves downward. The inner arc surface of the pressure block 7 is pressed against the outer wall of the shear ring 16 and pressure is applied to achieve the shear test of the sample.

[0038] The shear testing device disclosed in this embodiment adopts a combination design of a detachable first sample sleeve 10, a second sample sleeve 11, and a shear ring 16 with an adaptable second sample hole 17. This allows for flexible replacement of corresponding components to adapt to test samples of different sizes and shapes, meeting the shear testing needs of samples of various specifications. At the same time, stable installation with a universal testing machine is achieved through the upper connecting rod 3, the lower connecting rod 14, the upper pin hole 4, and the lower pin hole 15. With the precise fit between the inner arc surface of the pressure block 7 and the outer wall of the shear ring 16, the stability of the test force can be ensured by relying on the precise control of the testing machine. In addition, the robust connection structure and reasonable layout design between the components not only improve the ease of operation of the device but also effectively ensure the accuracy of the shear test results, which is conducive to its widespread application. Thus, a shear testing device has the beneficial effect of being able to test samples of various specifications or sizes.

[0039] See Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 Both the first sample sleeve 10 and the second sample sleeve 11 are T-shaped structures with several evenly distributed threaded holes 18 on their outer circumferential surfaces. The first sample sleeve 10 and the second sample sleeve 11 are detachably connected to the first support plate 8 or the second support plate 9 by bolts passing through the threaded holes 18. The T-shaped structure can provide stable support for the first sample sleeve 10 and the second sample sleeve 11, avoiding displacement during the test and ensuring the accuracy of sample installation. The detachable design of the first sample sleeve 10 and the second sample sleeve 11 allows for easy replacement of the first sample sleeve 10 and the second sample sleeve 11 with different sample hole sizes, meeting the shear test requirements of multiple sample specifications and improving the versatility and ease of operation of the device.

[0040] The upper connecting rod 3 and the lower connecting rod 14 are rectangular, square or cylindrical in shape, which allows the upper connecting rod 3 and the lower connecting rod 14 to be compatible with different types of mounting interfaces on the universal testing machine. This avoids the problem of limited device compatibility caused by the single shape of the testing machine interface and broadens the compatibility range of the device with universal testing machines of different specifications.

[0041] See Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 The upper pin hole 4 and the lower pin hole 15 are square or round in shape, which can accommodate pins of different shapes, meet the diverse needs of universal testing machine and device for pin shape when connecting, avoid the problem of insufficient connection adaptability due to single pin shape, and broaden the connection compatibility range between device and testing machine.

[0042] The first sample hole 12 of the first sample sleeve 10 and the second sample sleeve 11 and the second sample hole 17 of the shear ring 16 are all square, round or trapezoidal in shape. This allows the first sample hole 12 and the second sample hole 17 to be adapted to test samples with different cross-sectional shapes such as square, round and trapezoidal, avoiding the problem of limited applicability of the device due to the single cross-sectional shape of the sample. It meets the shear test requirements of multiple specifications and types of samples and significantly improves the versatility of the device.

[0043] See Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 The upper connecting plate 5 is larger than the upper connecting rod 3 and the support rod 6, and the lower connecting plate 13 is larger than the support plate and the lower connecting rod 14. On the one hand, this increases the contact area of ​​each part of the pressure head 1, disperses the shear force transmitted during the test, avoids local stress concentration that could lead to damage to the connection parts, and improves the overall structural stability of the pressure head 1. On the other hand, the connections of each part of the base 2 can ensure the overall structural rigidity of the base 2, thereby ensuring that the entire shear test device remains stable during the test, reducing the impact of device deformation on test accuracy, and balancing structural strength and test accuracy.

[0044] A sample slide 19 is provided between the first support plate 8 and the second support plate 9. The sample slide 19 is close to the lower connecting plate 13. The sample slide 19 is higher in the middle and lower on both sides. This allows the sample slide 19 to accurately receive the sample and shear ring 16 that fall after the test. The inclined structure with the middle being higher and the sides being lower guides the two to automatically detach from the device, simplifying the cleaning process, improving the convenience and efficiency of operation, and also preventing damage to the parts from collisions.

[0045] See Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 The upper connecting rod 3, upper connecting plate 5, support rod 6 and pressure block 7 are connected by welding or bolting. Welding connection can ensure that the connection of each component of pressure head 1 is stable to withstand the test force, while bolt connection facilitates component disassembly and maintenance. Both methods take into account structural stability and operational flexibility, and are suitable for different use needs.

[0046] The first support plate 8, the second support plate 9, the lower connecting plate 13, and the lower connecting rod 14 are connected by welding or bolting. Welding ensures that the first support plate 8, the second support plate 9, the lower connecting plate 13, and the lower connecting rod 14 are firmly connected to withstand the test load. Bolting facilitates the disassembly and maintenance of components. Both methods take into account the structural stability and operational flexibility of the base 2 and adapt to different usage needs.

[0047] See Figure 1, Figure 2 , Figure 3 , Figure 4 and Figure 5 The outer surface of the shear ring 16 is provided with a wear-resistant coating (not shown in the figure). The wear-resistant coating is a nitrided layer or a chromium-plated layer. By providing a wear-resistant coating of nitrided layer or chromium-plated layer on the outer surface of the shear ring 16, the wear resistance of the outer surface of the shear ring 16 can be enhanced, its service life can be extended, and the stability of the test process can be guaranteed.

[0048] The surface of the sample slide 19 is coated with polytetrafluoroethylene (not shown in the figure), and the tilt angle of the two sides of the sample slide 19 is 15° to 30°. This can reduce the friction between the sample and the sample slide 19 to help it slide smoothly, while ensuring the durability of the sample slide 19 and improving the cleaning efficiency after the test.

[0049] The inner arc surface of the pressure block 7 that contacts the shear ring 16 is provided with a buffer pad (not shown in the figure). The buffer pad is a rubber pad or a silicone pad, which can alleviate the impact force when the two come into contact, avoid damage to the parts, and ensure the stability of the test.

[0050] See Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 In this embodiment, the shear test device is installed on the universal testing machine in the form of a pin, which realizes the diversity of forms. First, the upper connecting rod 3 and the lower connecting rod 14 are designed to be rectangular, square, or cylindrical, preferably cylindrical. Second, the pin hole is designed to be circular. This design makes operation and installation more convenient.

[0051] See Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 In this embodiment, the shear testing device is installed on a universal testing machine and used in conjunction with the universal testing machine to perform shear tests. After the shear testing device is installed on the universal testing machine, a sample sleeve of the required size and shape is selected and installed on the first support plate 8 and the second support plate 9 respectively, and a shear ring 16 of the same size and shape as the sample sleeve is selected for later use. The sample is first passed through the first sample hole 12 on the first sample sleeve 10 installed on the first support plate 8, then the sample is passed through the second sample hole 17 on the shear ring 16, and finally through the first sample hole 12 on the second sample sleeve 11 installed on the second support plate 9. Pressure is then applied to the shear ring 16 by the pressure block 7 to perform a shear test on the sample.

[0052] See Figure 1 , Figure 2 , Figure 3 , Figure 4and Figure 5 In this embodiment, the device can meet the shear test requirements of samples of different sizes and specifications. At the same time, relying on the precise control of the universal testing machine, the device achieves convenient operation and accurate detection of the performance shear test. The method is simple, easy to operate, and conducive to widespread application.

[0053] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A shear testing apparatus, characterized in that: Includes a pressure head (1) and a base (2); The pressure head (1) has an upper connecting rod (3), which is located at the top of the pressure head (1). The upper connecting rod (3) has an upper pin hole (4) in its middle. The bottom of the upper connecting rod (3) has an upper connecting plate (5). A support rod (6) is connected below the upper connecting plate (5). The bottom end of the support rod (6) has a pressure block (7), which is semi-circular. The base (2) has a first support plate (8) and a second support plate (9) that are parallel to each other and spaced apart. The first support plate (8) and the second support plate (9) are respectively provided with a detachable first sample sleeve (10) and a second sample sleeve (11) at the upper part of their center. The first sample sleeve (10) and the second sample sleeve (11) are both provided with a coaxial first sample hole (12) at their axis. The inner ends of the first sample sleeve (10) and the second sample sleeve (11) are parallel to the inner sides of the first support plate (8) and the second support plate (9), respectively. The bottom of the first support plate (8) and the second support plate (9) are vertically connected to a lower connecting plate (13), and a lower connecting rod (14) is connected to the center of the bottom of the lower connecting plate (13). The lower connecting rod (14) has a lower pin hole (15) in the middle. A shear ring (16) with clearance fit is provided between the first sample sleeve (10) and the second sample sleeve (11). The axis of the shear ring (16) has a second sample hole (17) that is adapted to the first sample hole (12) and allows the sample to pass through. The outer wall of the shear ring (16) is adapted to the inner arc surface of the pressure block (7).

2. The shear testing apparatus according to claim 1, characterized in that: Both the first sample sleeve (10) and the second sample sleeve (11) are T-shaped structures, with several evenly distributed threaded holes (18) on their outer circumferential surfaces. The first sample sleeve (10) and the second sample sleeve (11) are detachably connected to the first support plate (8) or the second support plate (9) by bolts passing through the threaded holes (18).

3. The shear testing apparatus according to claim 1, characterized in that: The upper connecting rod (3) and the lower connecting rod (14) are rectangular, square or cylindrical in shape.

4. The shear testing apparatus according to claim 1, characterized in that: The upper pin hole (4) and the lower pin hole (15) are square or circular in shape.

5. The shear testing apparatus according to claim 1, characterized in that: The first sample hole (12) of the first sample sleeve (10) and the second sample sleeve (11) and the second sample hole (17) of the shear ring (16) are all square, circular or trapezoidal in shape.

6. The shear testing apparatus according to claim 1, characterized in that: The upper connecting plate (5) is larger than the upper connecting rod (3) and the support rod (6), and the lower connecting plate (13) is larger than the support plate and the lower connecting rod (14).

7. The shear testing apparatus according to claim 1, characterized in that: A sample slide (19) is provided between the first support plate (8) and the second support plate (9). The sample slide (19) is close to the lower connecting plate (13). The sample slide (19) is high in the middle and low on both sides.

8. The shear testing apparatus according to claim 1, characterized in that: The upper connecting rod (3), the upper connecting plate (5), the support rod (6) and the pressure block (7) are connected by welding or bolting.

9. A shear testing apparatus according to claim 1, characterized in that: The first support plate (8), the second support plate (9), the lower connecting plate (13) and the lower connecting rod (14) are connected by welding or bolting.

10. A shear testing apparatus according to claim 1, characterized in that: The outer surface of the shear ring (16) is provided with a wear-resistant coating.

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