A metal rod-shaped sample tensile test jig

Abstract

The application provides a metal rod-shaped sample tensile test clamp, and belongs to the technical field of metal material mechanical property testing equipment. The clamp aims to solve the problems of insufficient connection reliability, easy slippage, difficult accurate alignment and poor universality of the clamp in clamping non-standard samples in the prior art. The technical scheme of the application comprises: a clamp body, the clamp body comprises a clamping section and a mounting section arranged coaxially; wherein the outer peripheral surface of the clamping section is provided with anti-skid threads, and the end of the mounting section is provided with a hanging groove; an adaptive gasket, the shape of the adaptive gasket is matched with the inner wall of the hanging groove, and the adaptive gasket is detachably mounted in the hanging groove; and a length adjusting mechanism, the length adjusting mechanism is connected with the clamping section and the mounting section, and is used for adjusting the axial length of the clamp body. The application improves the connection reliability by setting the anti-skid threads, realizes high universality through the replaceable adaptive gasket, and facilitates the coaxiality calibration through the length adjusting mechanism, so as to ensure the test precision and reduce the cost.

Description

Technical Field

[0001] This application relates to the technical field of mechanical property testing equipment for metallic materials, and in particular to a highly versatile anti-slip tensile testing fixture. Background Technology

[0002] In the mechanical property testing of metallic materials, tensile testing is an important means of evaluating key indicators such as strength and plasticity. Standard tensile tests usually require specimens to have uniformly sized ends so that they can be directly and stably clamped by the grips of the tensile testing machine. However, in many engineering practices, such as when specimens need to be cut from structurally complex finished parts or irregularly shaped workpieces (such as wheel spokes), it is often difficult to process the ends of the specimen into standard shapes due to limitations in sampling location and space. Such non-standard or irregularly shaped specimens cannot be directly tested using traditional tensile testing equipment.

[0003] To address this issue, existing technologies have developed several adapter fixtures for holding non-standard specimens. For example, some solutions employ a fixture body with a specifically shaped receiving groove, used in conjunction with a pad that matches the shape of the receiving groove and the specimen end, achieving specimen clamping through filling. While these fixtures address the clamping problem of non-standard specimens to some extent, they still have several shortcomings. First, the connection between the fixture body and the testing machine's grips is typically a smooth cylindrical surface. Under high tensile forces, relative slippage can easily occur between these surfaces, potentially leading to inaccurate test data or even test interruption, thus requiring improved connection reliability. Second, the fixture itself usually lacks length adjustment functionality. After the specimen is installed, it is difficult to accurately calibrate the coaxiality between the specimen's central axis and the tensile testing machine's force axis. Misalignment can introduce additional bending moments, affecting the accuracy of test results. Third, the receiving groove structure is relatively simple, with limited adaptability. When the specimen's size or shape changes significantly, the entire fixture set must be replaced, resulting in poor versatility, high testing costs, and cumbersome operation. Summary of the Invention

[0004] The purpose of this application is to provide a highly versatile anti-slip tensile test fixture to solve the problems of insufficient connection reliability, easy slippage, difficulty in accurate alignment, poor versatility, and high replacement cost of existing tensile test fixtures when clamping non-standard specimens.

[0005] To achieve the above objectives, this application provides the following technical solution: a metal rod-shaped specimen tensile test fixture, characterized in that it comprises: a fixture body, the fixture body including a clamping section and an mounting section coaxially arranged; wherein, the outer peripheral surface of the clamping section is provided with anti-slip threads, and the end of the mounting section is provided with a hanging groove; an adapter gasket, the shape of the adapter gasket matching the inner wall of the hanging groove, and detachably installed in the hanging groove; and a length adjustment mechanism, the length adjustment mechanism connecting the clamping section and the mounting section, and used to adjust the axial length of the fixture body.

[0006] Optionally, the anti-slip thread is a trapezoidal thread or a sawtooth thread.

[0007] Optionally, the length adjustment mechanism is a spiral structure disposed between the clamping section and the mounting section.

[0008] Optionally, the hanging groove is a U-shaped hanging groove or a rectangular hanging groove.

[0009] Optionally, the adapter pad is provided with an inner hole or groove for accommodating and positioning the end of the sample hanger.

[0010] Optionally, the inner hole is a center positioning hole.

[0011] Optionally, the inner groove is a wedge-shaped fitting surface or a rectangular groove that matches the sample hanging head.

[0012] Optionally, the effective engagement length of the spiral structure is not less than half the length of the mounting section. Attached Figure Description [Attached Image Description]

[0014] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 A schematic diagram of the overall structure of a highly versatile anti-slip tensile testing fixture provided in this application embodiment;

[0016] Figure 2 This is a schematic diagram of the assembly of the clamp body and the adapter pad provided in the embodiments of this application;

[0017] Figure 3 This is a schematic diagram of the structure of an adapter gasket provided in an embodiment of this application;

[0018] Figure 4This is a cross-sectional schematic diagram of the fixture body provided in an embodiment of this application.

[0019] [Explanation of Labels in the Attached Image]

[0020] Wherein: 1-clamping section; 2-installation section; 3-adaptive gasket; 31-center positioning hole; 32-outer peripheral adapter; 4-hanging groove; 5-sample; 6-spiral structure.

[0021] Compared with the prior art, this application has the following beneficial effects:

[0022] 1. Excellent anti-slip performance and high testing accuracy. By setting anti-slip threads on the outer circumferential surface of the clamping section, the friction between the clamp and the testing machine chuck is increased, effectively preventing slippage under huge tensile forces, ensuring accurate transmission of tensile force and the accuracy and reliability of test data.

[0023] 2. High versatility and wide range of applications. By adopting the combination structure of "hanging groove + replaceable adapter shims", the same set of fixtures can flexibly adapt to a variety of non-standard samples with different diameters and different hanging head shapes. Only the low-cost adapter shims need to be replaced. There is no need to customize or replace the entire set of fixtures for different samples, which reduces the testing cost and improves the utilization rate of the equipment.

[0024] 3. Convenient coaxiality adjustment and good operability. The length adjustment mechanism located between the clamping section and the mounting section provides a simple and effective coaxiality fine-tuning mechanism. After the sample is installed, the operator can easily adjust the overall length of the clamp, thereby accurately calibrating the sample's central axis with the testing machine's force axis. This simplifies the alignment operation before the test, improves work efficiency, ensures uniform force on the sample, and further enhances testing accuracy.

[0025] 4. Stable and reliable clamping. The three-stage positioning and clamping structure, consisting of the specimen hanging head, adapter pad, and hanging groove, ensures the stable fixation of the specimen during the tensile process, avoiding test failure due to insecure clamping. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and specific embodiments. It is understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of protection of this application.

[0027] Example 1

[0028] This embodiment provides a highly versatile anti-slip tensile testing fixture. Please refer to [link / reference]. Figures 1 to 4 ,in, Figure 1 This is a schematic diagram of the overall structure of a highly versatile anti-slip tensile testing fixture provided in an embodiment of this application. Figure 2 This is an assembly diagram of the fixture body and the adapter pad. Figure 3 This is a structural diagram of an adapter gasket. Figure 4 This is a cross-sectional schematic diagram of the fixture body.

[0029] In the field of materials mechanical property testing, especially when performing tensile tests on non-standard rod-shaped specimens cut from irregularly shaped or complex workpieces, the embodiments of this application provide a reliable clamping solution, aiming to solve problems such as unreliable connection between the clamp and the testing machine, poor versatility for non-standard specimens, and difficulty in precise alignment in the prior art. In tensile testing, it is usually necessary to use two identical clamps in pairs, clamping the two ends of the specimen 5 respectively, and installing them between the upper and lower clamps of the tensile testing machine.

[0030] like Figure 1 As shown, the tensile test fixture of this embodiment mainly includes a fixture body and a detachable and replaceable adapter pad 3. The fixture body is composed of a clamping section 1 and an mounting section 2 arranged along a common central axis, forming an integral, adjustable-length rigid component.

[0031] Specifically, and referring to Figure 2 and Figure 4 Clamping section 1 is the part of the clamp body used to connect with the jaws of the tensile testing machine. To solve the slippage problem that easily occurs when using traditional smooth cylindrical surfaces with huge tensile forces, this embodiment has anti-slip threads machined on the outer circumferential surface of clamping section 1. These anti-slip threads increase surface roughness and form mechanical engagement, thereby improving the static friction coefficient and meshing force between clamping section 1 and the jaws of the testing machine. As a preferred solution, the anti-slip thread is a trapezoidal thread. Trapezoidal threads have a wider root and a larger thread angle, providing stable support and strong friction during clamping, effectively preventing axial slippage under a certain tensile load, ensuring accurate and lossless transmission of tensile force, and providing a fundamental guarantee for obtaining accurate and reliable test data. In a specific implementation, clamping section 1 can be designed as a cylinder with an outer diameter of 50 mm, and the thread height of the trapezoidal thread machined on it can be set to 0.8 mm, with a pitch of 3 mm. The material of the clamping section 1 is preferably a high-strength alloy steel that has undergone quenching and tempering treatment, such as 42CrMo or 35CrMoA, to ensure that it has sufficient strength, hardness and wear resistance under repeated clamping and high stress.

[0032] Mounting section 2 is coaxially arranged with clamping section 1, and it is the part of the clamp body used to mount and position sample 5. For example... Figure 1 and Figure 2As shown, at the end of the mounting section 2 furthest from the clamping section 1, a hanging groove 4 is provided for accommodating the adapter gasket 3. In this embodiment, the hanging groove 4 is designed as a U-shaped groove, with its upward-opening structure facilitating the sliding or removal of the adapter gasket 3 from above, making operation convenient. The inner wall dimensions of the hanging groove 4 are precision machined to ensure a tight fit with the outer periphery of the subsequently installed adapter gasket 3 without significant wobbling. For example, in a specific design, the overall length of the mounting section 2 can be 40 mm, and the width of the U-shaped hanging groove 4 at its end can be designed to be 20 mm, with a groove depth of 15 mm. This dimensional design can provide a stable mounting base for the adapter gasket 3 while ensuring sufficient load-bearing capacity.

[0033] A feature of this embodiment is the introduction of a removable and replaceable adapter pad 3. See also... Figure 3 The adapter pad 3 is an independent component that can be replaced according to the shape and size of the sample 5. The shape and size of its outer peripheral adapter portion 32 match the inner wall of the hanging groove 4 on the mounting section 2. In this embodiment, the outer peripheral adapter portion 32 of the adapter pad 3 is designed as a block structure that can be tightly embedded in the U-shaped hanging groove 4. When the adapter pad 3 is placed in the hanging groove 4, its bottom and side surfaces are tightly fitted with the inner wall of the hanging groove 4, forming a stable support structure. The adapter pad 3 is also made of high-strength alloy steel to withstand the enormous load transmitted by the sample 5 during the tensile process.

[0034] To accommodate specific specimens, the adapter shim 3 has an inner hole or groove for receiving and positioning the end head of the specimen 5. In this embodiment, for non-standard specimens 5 with rounded end heads, a central positioning hole 31 is provided on the adapter shim 3. The diameter of the central positioning hole 31 is precisely matched with the diameter of the end head of the specimen 5. For example, for specimens 5 with an end head diameter of 10 mm, the diameter of the central positioning hole 31 is also machined to 10 mm with a small tolerance to achieve a tight fit or transition fit. When the end head of the specimen 5 is inserted into the central positioning hole 31, the end of the specimen 5 is firmly positioned on the central axis of the fixture by the circumferential constraint of the hole wall, thus preventing radial movement.

[0035] By combining the aforementioned fixture body with replaceable adapter shims, this application achieves a high degree of versatility. When testing specimens with hanging heads of different diameters, the operator does not need to replace the entire fixture set, but only needs to replace a low-cost, correspondingly sized adapter shim 3. For example, a set of adapter shims 3 containing center positioning holes 31 with different apertures (e.g., diameters from 5 mm to 20 mm, one specification every 1 mm) can be pre-prepared, thus allowing a single fixture body to cover a wide range of circular cross-section specimen testing needs.

[0036] As an optional implementation, the clamping section 1 and the mounting section 2 are detachably connected by a length adjustment mechanism. This mechanism is used to fine-tune the overall axial length of the clamp after the specimen 5 is installed, in order to accurately calibrate the coaxiality of the central axis of the specimen 5 with the force axis of the tensile testing machine. Figure 4 As shown, in this embodiment, the length adjustment mechanism is specifically implemented as a spiral structure 6. Specifically, an external thread can be machined at the connecting end of the clamping section 1, and a matching internal thread can be machined at the corresponding connecting end of the mounting section 2. By rotating the clamping section 1 or the mounting section 2, the relative engagement depth between the two can be changed, thereby achieving continuous and precise adjustment of the total length of the clamp within a certain range. To ensure the rigidity and strength of the connection, the effective engagement length of the spiral structure 6 should be sufficiently long. As a preferred embodiment, its effective engagement length should not be less than half the length of the mounting section 2. For example, if the length of the mounting section 2 is 40 mm, then the effective engagement length of the spiral structure 6 should not be less than 20 mm to ensure that when adjusted to any length, the connecting part still has sufficient thread engagement to reliably transmit tensile loads without loosening or deformation.

[0037] When using the highly versatile anti-slip tensile testing fixture provided in this embodiment, the working process is as follows: First, the operator selects an adapter pad 3 with a corresponding center positioning hole 31 from a set of adapter pads according to the hanging head size of the test sample 5, and embeds it into the U-shaped hanging groove 4 at the end of the fixture body mounting section 2. Then, one end of the test sample 5 is aligned and inserted into the center positioning hole 31 of the installed adapter pad 3, forming a stable three-level positioning clamping structure consisting of the sample hanging head, the adapter pad 3, and the hanging groove 4. Next, another identical fixture is installed on the other end of the sample 5 using the same method. Then, the clamping sections 1 of the two fixtures assembled with the sample 5 are respectively installed into the upper and lower jaws of the tensile testing machine and clamped. Since the outer circumferential surface of the clamping section 1 is provided with trapezoidal anti-slip threads, under the action of the huge clamping force of the jaw jaws, the threads will form a firm mechanical engagement with the jaw surface, thereby preventing slippage that may occur during subsequent tensile testing. Before applying the load, the operator can slightly rotate one or both clamping sections 1 (or mounting sections 2) of the fixtures, using the adjustment function of the screw structure 6 to slightly change the overall length of the fixtures until the central axis of the specimen 5 is completely aligned with the force axis of the testing machine. Finally, after confirming that the clamping is secure and the coaxiality is correctly calibrated, the tensile testing machine can be started to apply tension to the specimen 5. Throughout the test, due to the reliable anti-slip effect of the anti-slip threads and the precise guarantee of coaxiality, the load applied by the testing machine can be accurately applied to the axial direction of the specimen 5, avoiding interference from additional bending moments, thereby obtaining accurate material mechanical property parameters.

[0038] In summary, this embodiment provides a tensile test fixture that is reliable in clamping, highly versatile, and easy to center by setting trapezoidal anti-slip threads in the clamping section 1, setting a U-shaped hanging groove 4 for installing replaceable adapter gaskets 3 in the mounting section 2, and using a spiral structure 6 to connect the clamping section 1 and the mounting section 2. This effectively improves the accuracy and efficiency of tensile testing of non-standard specimens.

[0039] Example 2

[0040] This embodiment discloses a variation of Embodiment 1, aiming to demonstrate the flexibility of the technical solution of this application in specific implementation. The overall structure and working principle of this embodiment are basically the same as those of Embodiment 1, with the main difference being the specific form of the anti-slip structure and the hanging groove.

[0041] In this embodiment, the fixture body is also composed of a clamping section 1 and a mounting section 2, which are connected by a spiral structure 6 to achieve length adjustment, and replaceable adapter pads 3 are used to adapt to different samples 5.

[0042] Unlike Embodiment 1, the anti-slip structure on the outer periphery of clamping section 1 in this embodiment employs a sawtooth thread. The sawtooth thread has an asymmetrical sawtooth profile, with its working surface (the surface primarily subjected to force in the tensile test) nearly perpendicular to the thread axis, while the non-working surface has a larger angle. This special thread profile gives the sawtooth thread excellent load-bearing capacity and anti-slip performance under unidirectional force. In the tensile test, since the tensile force is unidirectional, the working surface of the sawtooth thread can form a near-rigid vertical support and engagement with the jaws of the testing machine, resulting in a superior anti-slip effect compared to symmetrical trapezoidal threads. In a specific implementation, the sawtooth thread can be designed with a thread height of 0.6 mm, a pitch of 4 mm, an angle of 3 degrees between its working surface and the axis normal, and an angle of 30 degrees between its non-working surfaces.

[0043] Accordingly, another variation in this embodiment lies in the structure of the hanging groove 4 at the end of the mounting section 2. In this embodiment, a rectangular hanging groove is used instead of the U-shaped hanging groove in Embodiment 1. Specifically, the end of the mounting section 2 is machined into a groove with a rectangular cross-section, and the outer peripheral fitting portion 32 of the mating adapter 3 is also correspondingly rectangular. Compared to the U-shaped hanging groove, the rectangular hanging groove has a larger contact area with the rectangular adapter 3, especially providing constraint on all four sides. This makes the positioning of the adapter 3 in the hanging groove 4 more stable and provides stronger resistance to torsion and lateral forces. For clamping irregularly shaped specimens that may exhibit torsion during tensile testing, or in tests requiring extremely high tensile forces, this structure provides higher clamping stability. In a specific implementation, the groove width of the rectangular hanging groove can be designed to be 25 mm and the groove depth to accommodate adapter 3 of larger size or load-bearing requirements.

[0044] The working process of this embodiment is basically the same as that of Embodiment 1. In the assembly step, the operator inserts the rectangular adapter shim 3 into the rectangular hanging groove 4. In the fixture installation step, thanks to the excellent performance of the serrated thread, the connection between the fixture and the testing machine clamp is more secure. Throughout the testing process, the combination of the rectangular hanging groove and the rectangular shim also provides more stable support for the sample.

[0045] It is understood that the "anti-slip thread" disclosed in this application is not limited to trapezoidal threads. Any thread form that can increase friction and / or form mechanical engagement, such as the sawtooth thread in this embodiment, falls within the scope of protection of this application. Similarly, the "hanging groove" is not limited to U-shape. Any groove structure that can stably accommodate and position replaceable adapter gaskets, such as the rectangular hanging groove in this embodiment, is also an equivalent implementation of this application.

[0046] Example 3

[0047] This embodiment aims to further illustrate the diversity of the adaptable gasket design in this application, demonstrating its versatility, particularly its adaptability to non-standard specimens with non-circular cross-section hanging heads. The fixture body structure in this embodiment can be the same as in Embodiment 1 or Embodiment 2; for example, the fixture body with U-shaped hanging groove 4 described in Embodiment 1 can be used. The core difference in this embodiment lies in the internal structure of the adaptable gasket 3 and the shape of the specimen 5 it adapts to.

[0048] In engineering practice, the ends of samples cut from workpieces may be inconvenient or impossible to process into standard circular heads; for example, they may be processed into wedges, rectangles, or other irregular shapes. This embodiment provides a solution for this situation.

[0049] Assume that both ends of the test sample 5 are machined into wedge-shaped hanging heads. To clamp the sample 5, this embodiment provides a special matching adapter 3. The shape of the outer peripheral adapter portion 32 of the adapter 3 still matches the U-shaped hanging groove 4 on the mounting section 2 of the clamp body to ensure that it can be stably installed.

[0050] However, unlike the adapter pad in Example 1, the adapter pad 3 in this embodiment no longer has a circular central positioning hole 31 inside, but instead has a wedge-shaped adapter surface that perfectly matches the shape and size of the wedge-shaped head of the sample 5. This wedge-shaped adapter surface can be a through groove with a wedge-shaped cross-section. When the wedge-shaped head of the sample 5 is inserted into this groove, the two wedge-shaped inclined surfaces of the head will completely fit with the two wedge-shaped adapter surfaces of the inner groove of the adapter pad 3.

[0051] When using this wedge-shaped adapter pad 3 for tensile testing, a self-locking or self-amplifying clamping effect is generated after applying axial tensile force. Specifically, under the action of axial tensile force, the wedge-shaped hanger of the specimen 5 attempts to "pull out" from the wedge-shaped groove of the adapter pad 3, but due to the presence of the wedge-shaped surface, the axial tensile force is decomposed to generate a huge normal force perpendicular to the wedge-shaped contact surface. According to the law of friction, this normal force will correspondingly generate a huge frictional force, thereby preventing the hanger from sliding relative to the pad. The greater the tensile force, the greater the generated normal force and frictional force, ensuring that even under extremely high tensile loads, the specimen hanger can be locked very firmly in the adapter pad 3 without slippage.

[0052] Therefore, the versatility of this application is not only reflected in its ability to adapt to specimens of the same shape but also in its ability to adapt to specimens with completely different geometries by changing the adapter shims 3. In addition to the wedge-shaped adapter surface described in this embodiment, reliable clamping can be achieved for specimens with rectangular, T-shaped, dovetail-shaped, or any other irregularly shaped cross-section heads by designing and manufacturing adapter shims 3 with corresponding matching inner grooves. Thus, operators only need one set of clamp body and one set of adapter shims 3 containing various inner groove shapes to meet the tensile testing needs of various types of non-standard rod-shaped specimens. This expands the application range of the testing equipment and avoids the high cost and long development cycle of customizing special clamps for each special specimen.

[0053] Example 4

[0054] This embodiment will be combined with a specific industrial application scenario, namely, the mechanical property test of automobile wheel spoke material, to further illustrate the application process and beneficial effects of the fixture provided in this application in solving practical problems.

[0055] The spokes of automobile wheels are typically complex curved parts formed by stamping or casting from high-strength steel or aluminum alloy. It is very difficult to cut and prepare standard tensile specimens from such finished parts, but this process can be greatly simplified using the fixture provided in this application.

[0056] First, sampling and preparation are carried out. A long strip of sample is cut from the spokes of a scrapped automobile wheel along the critical path determined by stress analysis, using methods such as wire cutting or waterjet cutting. This strip is retained as the main body of the sample, requiring only simple local processing at both ends. In this embodiment, the two ends of the sample are machined into flat hangers with a thickness of 8 mm, a width of 15 mm, and a length of 20 mm by milling or grinding. This yields a non-standard sample 5 with the middle section retaining its original curved surface and thickness, while the two ends have regular rectangular cross-section hangers.

[0057] Next, the selection of clamps and adapter pads is performed. The operator takes out a clamp structure provided in this embodiment of the application. This structure includes a pair of clamp bodies (e.g., the clamp body with U-shaped hanging groove 4 and spiral structure 6 as described in Embodiment 1) and an accessory box containing adapter pads 3 of various specifications. For example, the accessory box may include adapter pads 3 of various specifications, which may have center positioning holes 31 of different diameters (e.g., diameter range covering 3 mm to 25 mm), or rectangular slots of different sizes (e.g., slot width range covering 5 mm to 30 mm, slot depth range covering 3 mm to 20 mm), or even pads with wedge-shaped adapter surfaces as described in Embodiment 3. For the sample 5 with an 8 mm × 15 mm flat hanging head, the operator selects an adapter pad 3 from the accessory box. The inner groove on the pad is a rectangular slot, the size of which is precisely matched with the sample hanging head, that is, the slot width is 15 mm and the slot depth is 8 mm.

[0058] Then, assembly and testing are performed. The operator inserts the selected adapter pad 3 with a rectangular slot into the U-shaped hanging groove 4 of the fixture body, and then precisely embeds the flat hanging head of the specimen 5 into the rectangular slot of the adapter pad 3, so that the hanging head fits tightly against the inner wall of the slot, forming a stable positioning. The other fixture is installed on the other end of the specimen 5 in the same way. The subsequent steps are basically the same as those described in Example 1: the assembled fixture and the specimen are installed into the upper and lower clamps of the tensile testing machine, and the anti-slip threads on the clamping section 1 are used to ensure a firm connection; by rotating the clamping section 1 or the mounting section 2, the total length of the fixture is finely adjusted using the spiral structure 6 to accurately calibrate the coaxiality of the specimen 5; finally, the testing machine is started to perform a tensile test until the specimen breaks, and the complete load-displacement curve is recorded.

[0059] The application scenario of this embodiment clearly demonstrates that for workpieces like wheel spokes, which are difficult to sample and prepare, testers do not need to perform complex global machining. They only need to perform the simplest forming treatment on the ends of the sample to complete accurate and reliable tensile tests using the fixture and corresponding adapter pads of this application. This solution not only simplifies the pre-test preparation process and shortens the test cycle, but also reduces the dependence on multiple special fixtures through a "one machine, multiple functions" approach, thereby saving enterprises considerable equipment and manufacturing costs.

[0060] The above description is merely a preferred embodiment of this application and is not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A tensile testing fixture for a metal rod-shaped specimen, characterized in that, include: A clamp body includes a clamping section and an mounting section coaxially arranged; wherein, the outer peripheral surface of the clamping section is provided with anti-slip threads, and the end of the mounting section is provided with a hanging groove; An adapter pad, the shape of which matches the inner wall of the hanging groove, and is detachably installed in the hanging groove; A length adjustment mechanism is provided, which connects the clamping section and the mounting section and is used to adjust the axial length of the clamp body.

2. The metal rod-shaped specimen tensile test fixture according to claim 1, characterized in that, The anti-slip thread is a trapezoidal thread or a sawtooth thread.

3. The metal rod-shaped specimen tensile test fixture according to claim 1, characterized in that, The length adjustment mechanism is a spiral structure disposed between the clamping section and the mounting section.

4. The metal rod-shaped specimen tensile test fixture according to claim 1, characterized in that, The hanging groove is a U-shaped hanging groove or a rectangular hanging groove.

5. A metal rod-shaped specimen tensile test fixture according to claim 1, characterized in that, The adapter pad is provided with an inner hole or groove for accommodating and positioning the end cap of the sample.

6. A metal rod-shaped specimen tensile test fixture according to claim 5, characterized in that, The inner hole is a central positioning hole.

7. A metal rod-shaped specimen tensile test fixture according to claim 5, characterized in that, The inner groove is a wedge-shaped fitting surface or a rectangular groove that matches the sample hanging head.

8. A metal rod-shaped specimen tensile test fixture according to claim 3, characterized in that, The effective engagement length of the spiral structure is not less than half the length of the installation section.

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