A hetero-material interface longitudinal shear test tool

Abstract

The present application belongs to the technical field of mechanical property testing of heterogeneous materials, and particularly relates to a heterogeneous material interface longitudinal shear testing tool, which comprises two clamping bodies and two conversion seats detachably connected with the clamping bodies, the clamping bodies are fixed on a universal testing machine through the conversion seats, and can be adapted to most universal testing machines at present; one end of the clamping body is connected with the conversion seat, and the other end has an L-shaped sample clamping part and is provided with a sample groove; when the two clamping bodies are arranged in an upper-lower relative manner and coaxially, the vertical face gap of the sample clamping parts of the two clamping bodies is matched, the combination interface of the heterogeneous materials is conveniently adjusted to the gap between the sample clamping parts of the two clamping bodies, the fracture position of the heterogeneous material testing is ensured to be the combination interface, and the accuracy of the testing result is ensured; in addition, a sample sleeve matched with the sample groove is additionally arranged, and the adaptability of the testing tool to samples with different shapes and lengths is improved.

Description

Technical Field

[0001] This application belongs to the field of shear fixtures for universal testing machines, and is used to test the interfacial bonding strength of different materials such as metals, plastics or other composite materials after bonding. Specifically, it relates to a longitudinal shear test fixture for heterogeneous material interfaces. Background Technology

[0002] Current methods for testing the interfacial shear strength of bonded samples are as shown in GB / T 7124-2008 "Determination of Tensile Shear Strength of Adhesives (Rigid Material to Rigid Material)" and GB / T 33334-2016 "Test Method for Tensile Shear Strength of Single Overlap Adhesive (Composite Material to Composite Material)". These methods involve bonding rigid or composite materials together by lapping them, and then applying force along the long axis of the specimen using a universal testing machine. This method is more suitable for testing the bond strength of sheet or strip materials. For relatively thick cylindrical or cuboid specimens, butt joints are usually used instead of lap joints. Generally, force is applied perpendicular to the long axis of the specimen using a universal testing machine at the interface between the dissimilar materials to determine the interfacial shear strength.

[0003] Both of the above methods require that the clamps and the specimens do not move or rotate relative to each other when the universal testing machine applies force. It is essential to ensure that the long axis of the specimen is aligned with or perpendicular to the direction of the applied force, and that the bonding interface is aligned with the center line of the clamps. Otherwise, the specimens may deform due to misalignment or relative movement during clamping, or even crack in the bonding area of ​​the specimens, resulting in specimen damage. Alternatively, the test results may be inaccurate because the bonding interface of the specimens is not aligned with the center of the clamps.

[0004] To address the aforementioned problems, existing technologies such as CN209014384U disclose a fixture for testing the shear force of adhesive bonding, including a first fixture and a second fixture positioned opposite each other. The first fixture includes a first base, a first mounting plate, and a first clamping part movably disposed on the first mounting plate, the first clamping part being movable in a direction perpendicular to the first mounting plate; the second fixture includes a second base, a second mounting plate, and a second clamping part movably disposed on the second mounting plate, the second clamping part being movable in a direction perpendicular to the second mounting plate. The two bases are fixedly connected by a connector, and there is a clearance groove between the first base and the second base. The first clamping part and the second clamping part move coaxially so that one of the adhesive plates of the sample is located in the clearance groove, and the other adhesive plate of the sample is located above the first base or the second base. Since the first clamping part and the second clamping part are kept coaxial, the fixture can ensure that there is no relative movement between the fixture and the sample during the test. Before the first adhesive plate falls into the clearance groove, there is no relative movement between the fixture and the sample, thereby improving the reliability of the test results.

[0005] Because the force applied by a universal testing machine is typically vertical, the transverse relief groove structure in this fixture makes it difficult to apply to commonly used universal testing machines. Furthermore, the fixture's side clamping and tightening via two clamps creates a clamping force on the bonded interface, leading to inaccurate test results when performing longitudinal shear tests, as the measured values ​​are greater than the actual values. Additionally, this fixture is only suitable for testing bonded samples of different sizes. By placing the larger bonded plate within the relief groove and the smaller bonded plate above the base, the bonded interface is positioned; however, positioning remains difficult for bonded samples of the same size. Summary of the Invention

[0006] To address the problems of incompatibility between existing fixtures for longitudinal shear testing of samples and universal testing machines, inaccurate test results due to compressive stress at the adhesive interface, and difficulty in locating the longitudinal shear interface, this application aims to provide a fixture for testing the longitudinal shear strength of adhesive interfaces of heterogeneous samples that is compatible with existing universal testing machines. The fixture's structure is adjusted to allow it to be used for shear testing of adhesive samples in both horizontal and vertical positions. By adding a conversion seat adapted to the fixture, which is then fixed to the universal testing machine, this application's testing fixture can be adapted to most universal testing machines. Furthermore, the fixture has a certain clearance when coaxially fitted, facilitating the adjustment of the bonding interface of the sample under test within this clearance to ensure that the broken surface of the sample is the adhesive interface.

[0007] Based on the above objectives, the technical solution adopted by the present invention is as follows: A longitudinal shear test fixture for heterogeneous material interfaces includes two cylindrical clamps arranged opposite each other, and two conversion seats detachably connected to the two clamps. The two conversion seats are respectively connected to the upper base and the lower base of a universal testing machine. One end of the clamp is detachably connected to the conversion seat, and the other end of the clamp is vertically cut along its end face to form an L-shaped sample holding part, which has a sample groove. When the two clamps are arranged opposite each other and coaxially, the vertical surfaces of the sample holding parts of the two clamps are clearance-fitted.

[0008] For example, the vertical distance between the center point of the horizontal plane of the L-shaped sample clamping part and its vertical plane is 0.5 to 2 mm. When the two clamping parts are set up opposite each other and are coaxial, the distance between the vertical planes of the sample clamping ends of the two clamping parts is 1 to 4 mm.

[0009] The preferred size is 0.5 to 2 mm, such as 0.5 mm, 1 mm, 1.5 mm, 2 mm, etc., and the corresponding gap between the two clamps after they are fastened together is 1 mm, 2 mm, 3 mm, 4 mm.

[0010] The test fixture of this application uses two conversion seats to be fixed to the upper and lower bases of the universal testing machine in advance and adjusted to a suitable position. The upper clamp is fixed to the upper base through the conversion seat. The sample is placed in the sample slot. Then, the lower clamp is fastened to the upper clamp and fixed to the lower conversion seat. The longitudinal shear strength of the sample interface is tested by tension or compression.

[0011] This application's testing fixture, by adding a matching conversion seat, allows the clamping body to be adapted to most current universal testing machines for specimen shear testing. When the two clamping bodies are coaxial and positioned opposite each other to hold the sample, a gap of 1-4 mm is formed between them. When the two materials of the test specimen have the same diameter and their lengths match the sample groove, the interface of the sample after the two clamping bodies are engaged is located within the 1-4 mm gap between the clamping bodies. This ensures that during interfacial shear testing under tension or compression between the two clamping bodies, the shear fracture surface is the adhesive interface of the dissimilar materials.

[0012] The testing fixture in this application does not apply force to the end of the sample to be tested, so it will not cause the bonding interface of the sample to be subjected to compressive force, making the test results more reflective of the true bonding interface shear strength.

[0013] Furthermore, the end of the clamp body connected to the conversion seat consists of a frustum and a square platform fixed on the frustum; a locking nut is provided on the frustum; a slot is provided on the conversion seat to mate with the square platform; the end of the conversion seat also has an outer edge with the same diameter as the frustum; both the frustum and the outer edge have external threads of the same specification that mate with the locking nut, and when the clamp body is fixed on the conversion seat, it is locked and fixed by the locking nut.

[0014] To improve the connection stability between the clamp body and the conversion seat, a lock nut is used to lock and fix them when the clamp body and the conversion seat are connected.

[0015] Furthermore, both the square platform and the conversion seat are provided with pin holes. When the clamp body is fixed on the conversion seat, the pin holes on the square platform and the pin holes on the conversion seat are coaxial and are fixed by pins.

[0016] To facilitate the fixing of the clamp body and the conversion seat, the clamp body and the conversion seat are pre-fixed with pins and then fixed with lock nuts.

[0017] Furthermore, the testing fixture also includes a sample sleeve that mates with the sample well; the length of the sample sleeve is the same as the depth of the sample well.

[0018] The sample sleeve can be adapted to test samples of various lengths and shapes without the need to develop multiple sets of fixtures, thus reducing costs. However, to ensure that the shear interface of the sample is not affected by the sample sleeve, the length of the sample sleeve is consistent with the depth of the sample groove. When the sample sleeve is placed in the sample groove, the outer surface of the sample sleeve is on the same plane as the outer surface of the sample groove.

[0019] Furthermore, a magnetic boss is provided in the sample slot, a sample hole is opened at one end of the sample sleeve, and a positioning hole that cooperates with the magnetic boss is opened at the other end; a magnetic coating that cooperates with the magnetic boss is provided in the positioning hole.

[0020] To improve the stability of the sample within the sample slot, a combination of snap-fit ​​and magnetic attraction is used for fixation.

[0021] Furthermore, a positioning groove is provided at the bottom of the sample sleeve along the length of the sample sleeve; a threaded hole is provided on the positioning groove.

[0022] For samples of different lengths, screws that mate with the threaded holes in the positioning grooves can be used to fix the samples. Regardless of whether the lengths of the two parts of the dissimilar materials are the same, simply place the interface at the end of the sample sleeve and then use screws to fix the sample in one of the clamping bodies to ensure that the interface of the dissimilar materials is located in the gap between the two clamping bodies.

[0023] Furthermore, the adapter is also equipped with screws that mate with the upper or lower base. The adapter can be fixed to the base of the universal testing machine using screws.

[0024] Compared with the prior art, the beneficial effects of the present invention are as follows: The test fixture of this application can perform shear tests on the interface of heterogeneous materials by opposite tension or compression, whether it is in a horizontal or vertical position. By adding a conversion seat that matches the fixture body and fixing it on the base of the universal testing machine, the test fixture of this application can be adapted to most existing universal tensile testing machines.

[0025] The test fixture in this application is improved by modifying the clamping body. One end is easy to connect to a universal testing machine, and the other end provides a 1-4mm longitudinal shearing space for heterogeneous materials. This facilitates the adjustment of the sample bonding interface at the gap after the clamping body is engaged, ensuring that the fracture location of the specimen is at the bonding interface during tensile or compressive shear tests.

[0026] This application, by setting up a sample sleeve, can be adapted to perform shear tests on heterogeneous material samples of various lengths, reducing the processing requirements for the samples; in addition, the addition of a sample sleeve can be used to test various different shapes of specimens such as cuboids or cylinders, eliminating the need to develop a set of adaptable fixtures for different shaped samples, thus improving the sample adaptability of the fixtures. Attached Figure Description

[0027] Figure 1 Image of the sample to be tested in Example 1; Figure 2 This is an overall structural diagram of the test fixture in Example 1; Figure 3 Here are the main view, cross-sectional view, and enlarged view of the test fixture in Example 1; Figure 4 This is an exploded view of the test fixture in Example 1; Figure 5 This is a structural diagram of the test tooling conversion seat for Example 1; Figure 6 This is a structural diagram of Example 1. Figure 7 This is a structural diagram of the sample sleeve from Example 1; Figure 8 This is a three-dimensional cross-sectional view of the sample sleeve of Example 1; Figure 9 This is a structural diagram of the sample sleeve from Example 2; Figure 10 This is a three-dimensional cross-sectional view of the sample sleeve in Example 2.

[0028] The numbers and markings in the diagram are as follows: 1. First clamping body; 2. Second clamping body; 3. First conversion seat; 4. Second conversion seat; 5. Connecting part; 501. Frustum; 502. Frustum; 6. Sample clamping part; 601. Horizontal section; 602. Vertical section; 603. Sample groove; 604. Magnetic boss; 7. Locking nut; 8. Groove; 9. Outer edge; 10. Pin hole; 11. Sample sleeve; 1101. Sample hole; 1102. Positioning hole; 1103. Positioning groove; 1104. Threaded hole; 12. Sample. Detailed Implementation

[0029] To better illustrate the purpose, technical solution, and advantages of this invention, the invention will be further described below with reference to specific embodiments. Those skilled in the art should understand that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. Unless otherwise specified, the experimental methods used in the embodiments are conventional methods; the materials and reagents used, unless otherwise specified, are commercially available. Example 1

[0030] This embodiment uses a sample bonded with a stainless steel rod and a copper rod as an example. The dimensions of the sample to be tested and the schematic diagram of the applied shear force are shown below. Figure 1 The sample 12 to be tested is a cylinder of equal diameter (Φ6×25mm) made of stainless steel rod and copper rod bonded together. The longitudinal shear strength of the bonded interface of sample 12 is measured by applying opposing forces at the interface between the stainless steel rod and the copper rod until they separate.

[0031] This embodiment uses the above-mentioned sample to be tested as an example to provide a longitudinal shear test fixture for heterogeneous material interfaces, the structure of which is as follows: Figures 2-5 As shown, the universal testing machine includes two identical clamping bodies, a first clamping body 1 and a second clamping body 2, arranged vertically opposite each other. One end of each clamping body 1 and clamping body 2 is detachably connected to a first conversion seat 3 and a second conversion seat 4, respectively. The two conversion seats are connected to the upper and lower bases of the universal testing machine, respectively. Each conversion seat is equipped with screws that mate with either the upper or lower base, allowing it to be fixed to the base of the universal testing machine. The other end of each clamping body 1 and clamping body 2 serves as a sample clamping end. When the sample 12 to be tested is placed in the clamping body 1 and clamping body 2, the universal testing machine can move the clamping body 1 and clamping body 2 towards or away from each other, thus enabling the longitudinal shear strength test of the adhesive interface of the sample 12.

[0032] The structures of the first clamping body 1 and the second clamping body 2 are as follows: Figure 6 As shown, both the first clamping body 1 and the second clamping body 2 are integrally connected by a sample clamping part 6 and a connecting part 5 connected to the conversion seat. The connecting part 5 consists of a frustum 501 and a square platform 502 fixed on the frustum 501. The frustum 501 has a locking nut 7 that mates with it, and the square platform 502 has a pin hole 10. Both the first conversion seat 3 and the second conversion seat 4 have slots 8 that mate with the square platform 502. The end of the conversion seat also has an outer edge 9 with the same diameter as the frustum 501. Both the frustum 501 and the outer edge 9 have external threads of the same specification that mate with the locking nut 7, and the conversion seat also has a pin hole 10. When the two clamping bodies are docked and fixed to the conversion seat, the connecting part 5 of the clamping body is pre-fixed to the conversion seat by a pin, and then locked by the locking nut 7, improving the connection stability between the clamping body and the conversion seat.

[0033] Since the upper and lower bases of the universal testing machine are coaxial, and since the conversion seat and clamping body are made of metal and have strong rigidity, the first conversion seat 3, the first clamping body 1, the second clamping body 2, and the second conversion seat 4 are also coaxial when they are fixed on the universal testing machine in sequence.

[0034] The sample clamping ends of the first clamping body 1 and the second clamping body 2 are cylindrical in shape. An L-shaped sample clamping part 6 is formed by vertically cutting off the cylindrical end perpendicular to the end face. The sample clamping part 6 consists of a horizontal section 601 and a vertical section 602. The vertical section 602 has a sample groove 603. The vertical distance (d) between the center point of the plane of the horizontal section 601 of the sample clamping part 6 and the cutting plane of the vertical section 602 is 0.5 to 2 mm. When the two clamping bodies are arranged opposite each other and coaxially, the distance between the vertical surfaces of the sample clamping ends of the two clamping bodies is 1 to 4 mm. That is, when the two clamping bodies are fastened together coaxially, there is a gap of 1 to 4 mm. In order to ensure that the force of the two clamping bodies is on the adjacent sides of the interface of the sample 12 to be tested, it is best to have a certain gap after the two clamping bodies are fastened together so that the interface of the sample 12 to be tested is located in the gap. Therefore, the vertical distance between the center point of the horizontal section 601 plane of the sample clamping part 6 and the cutting plane of the vertical section 602 should be >0, preferably 0.5 to 2 mm, such as 0.5 mm, 1 mm, 1.5 mm, 2 mm, etc. The corresponding gaps after the two clamping bodies are engaged are 1 mm, 2 mm, 3 mm, 4 mm, which facilitates adjusting the joint interface of the sample 12 to be tested to be located at the gap between the first clamping body 1 and the second clamping body 2 after being engaged coaxially.

[0035] Since the size of the sample cell 603 is fixed, the length of the sample 12 to be tested is required to be high. The stainless steel rod and the copper rod in the sample 12 to be tested must be the same size and the same size as the sample cell 603.

[0036] To reduce the processing requirements for the stainless steel and copper bars in the test sample 12 to have the same length, the testing fixture of this application also includes a sample sleeve 11 that mates with the sample groove 603, the structure of which is as follows: Figure 7 , Figure 8 As shown, the sample sleeve 11 can be tightly fitted or loosely fitted with the sample groove 603, but the length of the sample sleeve 11 is the same as the depth of the sample groove 603. When the sample sleeve 11 is placed in the sample groove 603, the outer surface of the sample sleeve 11 is on the same plane as the outer surface of the sample groove 603 to ensure that the shear interface of the sample 12 is not affected by the sample sleeve 11.

[0037] To improve the stability of the sample sleeve 11 within the sample groove 603, a magnetic protrusion 604 is provided within the sample groove 603. One end of the sample sleeve 11 has a sample hole 1101, and the other end has a positioning hole 1102 that mates with the magnetic protrusion 604. The positioning hole 1102 is provided with a magnetic coating that mates with the magnetic protrusion 604, so that the sample sleeve 11 is fixed to the sample groove 603 by snap-fit ​​and magnetic attraction, thereby comprehensively improving the stability of the sample sleeve 11 within the sample groove 603.

[0038] The bottom of the sample sleeve 11 has a positioning groove 1103 along the length of the sample sleeve 11; the positioning groove 1103 has a threaded hole 1104, and the sample 12 placed in the sample sleeve 11 can be fixed by screws. When fixing with screws, the length of the screws does not exceed the depth of the positioning groove 1103, so as to ensure that after the sample 12 is fixed in the sample sleeve 11, the sample sleeve 11 can be embedded in the sample groove 603 of the clamping body.

[0039] For stainless steel and copper bars of different lengths, the sample 12 can be fixed using screws that mate with the threaded holes 1104 on the positioning groove 1103. Regardless of whether the two parts of the dissimilar materials are the same length, as long as the interface is located at the end of the sample sleeve 11, and the sample 12 is fixed in one of the clamping bodies using screws, the interface of the dissimilar materials can be ensured to be located in the gap between the two clamping bodies. The sample sleeve 11 can be adapted to the testing of various sample 12s of different lengths, reducing the processing requirements for the length of the sample 12 to be tested, and eliminating the need to develop multiple sets of clamps, thus reducing costs.

[0040] The specific method for performing interface shearing tests on the test sample 12 using the testing fixture in this application is as follows: (1) Insert the sample 12 to be tested into the sample hole 1101 of the sample sleeve 11, adjust the insertion depth of the sample 12 to make the bonding interface of the sample 12 close to the outer end face of the sample hole 1101 of the sample sleeve 11, fix the sample 12 by passing the screw through the threaded hole 1104 on the positioning groove 1103, insert the sample sleeve 11 on the other end of the sample 12 to be tested, and fix it with the screw to obtain the sample 12 to be tested with the sample sleeve 11. The bonding interface of the sample 12 to be tested is at the joint of the two sample sleeves 11.

[0041] (2) The first conversion seat 3 and the second conversion seat 4 are fixedly connected to the upper base and the lower base of the universal tensile testing machine, respectively, and the second clamping body 2 is fixedly connected to the second conversion seat 4 through the pin and the locking nut 7.

[0042] (3) Insert the sample sleeve 11 of the fixed sample 12 into the sample groove 603 of the first clamping body 1, and then insert the sample sleeve 11 of the other end of the sample 12 into the sample groove 603 of the second clamping body 2. Hold the first clamping body 1 and the second clamping body 2 to fix them coaxially for a temporary time. Adjust the base of the tensile testing machine to move down until the square platform 502 of the first clamping body 1 is fully engaged with the groove 8 of the first conversion seat 3. Insert the pin into the pin hole 10 and use the locking nut 7 to fix the first clamping body 1 and the first conversion seat 3.

[0043] (4) Start the universal tensile testing machine to apply force in opposite directions until the two parts of the sample 12 to be tested are separated from each other at the interface. Record the maximum force when the two parts are separated as the shear strength of the sample 12 to be tested.

[0044] In summary, the testing fixture of this application can perform shear strength tests on the interface of the sample 12 under test by applying forces in opposite directions, whether in a horizontal or vertical position. By adding a matching conversion seat, the fixture of this application can be adapted to most universal testing machines for sample shear testing. Furthermore, when the two fixtures of this application are coaxial and positioned opposite each other to hold the sample 12, there is a gap of no more than 4mm between the fixtures. This facilitates the adjustment of the sample 12 under test so that its interface is within this gap, ensuring that the shear fracture surface is the adhesive interface of the heterogeneous materials during the interface shear test under tension or compression of the two fixtures. In addition, by providing the sample sleeve 11, this application can be adapted to perform shear tests on heterogeneous material samples of various lengths, reducing the processing requirements for the samples. Example 2

[0045] The difference between this embodiment and Embodiment 1 is that the external dimensions of the sample sleeve 11 are the same as those of the sample sleeve 11 in Embodiment 1, but its internal structure is different from that of Embodiment 1. The structure of the sample sleeve 11 in this embodiment is as follows: Figure 9 and Figure 10 As shown, this method is mainly applicable to shear testing of cuboid samples. In this embodiment, the sample hole 1101 is a square hole instead of the circular hole in Embodiment 1, but the size of the positioning hole 1102 is the same as in Embodiment 1. Similarly, the positioning hole 1102 in this embodiment is provided with a magnetic coating that cooperates with the magnetic boss 604, which improves the stability of the sample sleeve 11 in the sample groove 603 by snap-fit ​​and magnetic attraction. Unlike the sample sleeve 11 in Embodiment 1, the sample sleeve 11 in this embodiment has three positioning grooves 1103 at the bottom. One is provided along the width direction of the sample sleeve 11 near the entrance of the sample hole 1101, and two are provided along the length direction of the sample sleeve 11, all located below the sample hole 1101, in order to enhance the stability of the square sample.

[0046] This application adds a sample sleeve 11 to accommodate the testing of various shapes such as cuboids or cylinders, eliminating the need to develop a set of matching fixtures for different shapes of samples and improving the sample adaptability of the fixtures.

Claims

1. A longitudinal shear test fixture for heterogeneous material interfaces, characterized in that, The device includes two cylindrical clamping bodies arranged vertically opposite each other, and two conversion seats detachably connected to the two clamping bodies. The two conversion seats are respectively connected to the upper base and the lower base of the universal testing machine. One end of each clamping body is detachably connected to the conversion seat, and the other end of each clamping body is vertically cut along its end face to form an L-shaped sample holding part. The sample holding part has a sample groove. When the two clamping bodies are arranged vertically opposite each other and coaxially, the vertical surfaces of the sample holding parts of the two clamping bodies are clearance-fitted.

2. The longitudinal shear test fixture for heterogeneous material interfaces as described in claim 1, characterized in that, The end of the clamp body connected to the conversion seat consists of a frustum and a square platform fixed on the frustum; the frustum is provided with a locking nut that mates with it; the conversion seat has a slot that mates with the square platform; the end of the conversion seat is also provided with an outer edge of the same diameter as the frustum; both the frustum and the outer edge are provided with external threads of the same specification that mate with the locking nut, and when the clamp body is fixed on the conversion seat, it is locked and fixed by the locking nut.

3. The longitudinal shear test fixture for heterogeneous material interfaces as described in claim 2, characterized in that, Both the square platform and the conversion seat are provided with pin holes. When the clamp is fixed on the conversion seat, the pin holes on the square platform and the pin holes on the conversion seat are coaxial and are fixed by pins.

4. The longitudinal shear test fixture for heterogeneous material interfaces as described in claim 1, characterized in that, The testing fixture also includes a sample sleeve that mates with the sample groove; the length of the sample sleeve is the same as the depth of the sample groove.

5. The longitudinal shear test fixture for heterogeneous material interfaces as described in claim 4, characterized in that, The sample slot is provided with a magnetic protrusion, one end of the sample sleeve is provided with a sample hole, and the other end is provided with a positioning hole that cooperates with the magnetic protrusion; the positioning hole is provided with a magnetic coating that cooperates with the magnetic protrusion.

6. The longitudinal shear test fixture for heterogeneous material interfaces as described in claim 5, characterized in that, The bottom of the sample sleeve has a positioning groove along the length of the sample sleeve; the positioning groove has a threaded hole.

7. The longitudinal shear test fixture for heterogeneous material interfaces as described in claim 1, characterized in that, The conversion base is also provided with screws that cooperate with the upper base or the lower base.

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