Metal stretching, overlapping and shearing sample and manufacturing method and device thereof

Abstract

The invention relates to the technical field of tensile samples, in particular to a metal tensile lap joint shear sample and a manufacturing method and device.The manufacturing device comprises a base and two cold insert molds fixed to the same plane of the base, cavities of the two cold insert molds are symmetrically arranged, each cavity comprises an opening and a filling opening, the two openings are oppositely arranged, and the filling opening is communicated with the base. The intermediate product of the metal stretching, overlapping and shearing test sample is positioned between the two chambers, and the material sheet end of the intermediate product of the metal stretching, overlapping and shearing test sample penetrates through the opening and extends into the chambers; a plastic sealing medium is arranged between the inner wall of the opening and the end of the material sheet; filling a cold insert into the cavity through the filling port, and forming a cold insert fixedly connected with the end of the material sheet after the cold insert is cured; and the thickness of the cavity is greater than that of an intermediate product of the metal tensile lap joint shear sample. The prepared metal stretching, overlapping and shearing sample can eliminate the damage effect of component force in the normal direction of a welding interface of the metal stretching, overlapping and shearing sample during axial stretching, and the sample is prevented from being twisted during axial stretching.

Description

Technical Field

[0001] The present invention relates to the technical field of tensile specimens, and in particular to a metal tensile lap shear specimen and a manufacturing method and device thereof. Background Art

[0002] Tensile testing is often used to evaluate the bond performance of sheet metal after lap welding (e.g., electromagnetic pulse welding). During the tensile process, the weld interface is required to withstand forces roughly parallel to the interface. The stresses during the tensile process are primarily shear, hence the name "tensile lap shear" specimen.

[0003] Currently, the fixtures used in tensile testing machines are all symmetrically constructed to ensure that the tensile force applied during the stretching process coincides with the axes of the upper and lower fixtures. However, the two ends of a tensile lap shear specimen are not in the same plane. When the tensile testing machine fixture clamps the specimen, it will inevitably generate a force component in the normal direction of the weld interface, causing immeasurable damage to the interfacial bonding state. This damage will increase with increasing specimen thickness, affecting the tensile lap shear load test results of the specimen. Summary of the invention

[0004] The object of the present invention is to provide a metal tensile lap shear specimen and a method and device for making the same, which can eliminate the damaging effect of the component force in the normal direction of the welding interface of the metal tensile lap shear specimen during axial tension and avoid the specimen from twisting during axial tension.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is as follows: In the first aspect, the present invention discloses a device for making metal tensile lap shear specimens, comprising a base and two cold-mounting molds fixed on the base; the cavities of the two cold-mounting molds are symmetrically arranged, and the cavity of a single cold-mounting mold comprises an opening and a filling port, the cavity openings of the two cold-mounting molds are arranged relative to each other, the intermediate product of the metal tensile lap shear specimen is located between the two cavities, and the sheet end of the intermediate product of the metal tensile lap shear specimen extends into the cavity through the opening; a plastic sealing medium is arranged between the inner wall of the opening and the sheet end; a cold-mounting agent is filled into the cavity through the filling port, and after the cold-mounting agent is solidified, a cold-mounting block fixedly connected to the sheet end is formed; the thickness of the cavity is greater than the thickness of the intermediate product of the metal tensile lap shear specimen.

[0006] Furthermore, the cold-insertion mold includes a bottom plate and at least one side plate fixed to the bottom plate, and the bottom plate and the side plate together form a cavity.

[0007] Further, the chamber is in the shape of a cuboid. The top surface of the chamber penetrates through the cold mounting mold to form a filling port, and an opening through which the end of the sheet for accommodating the intermediate product of the metal tensile lap shear specimen passes is formed on one side of the chamber in the length direction by penetrating through the cold mounting mold.

[0008] Further, the length of the opening is less than or equal to the thickness of the chamber; the width of the opening is less than or equal to the height of the chamber.

[0009] Further, the plastic sealant medium is plasticine, silicone clay or paraffin.

[0010] Further, the inner wall of the plastic sealant medium close to the chamber side is flush with the inner wall of the chamber.

[0011] Further, the material of the cold mounting mold is soft silicone, and the materials of the sheet include iron, steel, aluminum, aluminum alloy, copper, copper alloy, magnesium, magnesium alloy, titanium, titanium alloy, lithium, lithium alloy, zirconium or zirconium alloy.

[0012] In a second aspect, the present invention discloses a method for manufacturing a metal tensile lap shear specimen, which is manufactured by using the above-mentioned manufacturing device for a metal tensile lap shear specimen, and includes: Providing an intermediate product of a metal tensile lap shear specimen, which intermediate product of the metal tensile lap shear specimen includes two sheets lap-fixed; Inserting the ends of the sheets at both ends of the intermediate product of the metal tensile lap shear specimen through the openings of the two cold mounting molds and into the chamber respectively; Sealing the gap between the inner wall of the opening and the end of the sheet by using a plastic sealant medium; Filling the chamber with a cold mounting agent through the filling port, and after the cold mounting agent is cured, a cold mounting block fixedly connected to the end of the sheet is formed; Taking out to obtain a finished metal tensile lap shear specimen.

[0013] Further, when the thickness of the sheet is 1 - 2 mm, the length of the end of the sheet extending into the chamber is 10 - 20 mm; When the thickness of the sheet is 2 - 3 mm, the length of the end of the sheet extending into the chamber is 20 - 30 mm; When the thickness of the sheet is 3 - 4 mm, the length of the end of the sheet extending into the chamber is 30 - 50 mm.

[0014] In a third aspect, the present invention discloses a metal tensile lap shear specimen, which is prepared by using the above-mentioned method for manufacturing a metal tensile lap shear specimen, and includes two sheets lap-fixed. The cold mounting blocks fixed to the ends of the sheets away from the lap zone have the same thickness to eliminate the torque generated due to the lap misalignment of the specimen during the clamping process of the tensile test.

[0015] The present invention has the following unexpected beneficial effects: The present invention fills a cold inlaying agent into the chamber of the cold inlaying mold through a filling port. After the cold inlaying agent is cured, a cold inlaying block fixedly connected to the end of the sheet is formed. Using the cold inlaying block as the installation part fixedly connected to the fixture supporting the tensile testing machine, it avoids generating a component of force in the normal direction of the welding interface when clamping the specimen, thereby eliminating the damaging effect of the component force in the normal direction of the welding interface of the metal tensile lap shear specimen during axial tension, and avoiding the specimen from kinking during axial tension. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The structural schematic diagram of the manufacturing device of the metal tensile lap shear specimen described in the embodiment of the present invention is shown.

[0017] Figure 2 The schematic diagram of an optional implementation manner of the cold inlaying mold described in the embodiment of the present invention is shown.

[0018] Figure 3 The schematic diagram of another optional implementation manner of the cold inlaying mold described in the embodiment of the present invention is shown.

[0019] Figure 4 The structural schematic diagram of the intermediate product of the metal tensile lap shear specimen described in the embodiment of the present invention is shown.

[0020] Figure 5 The structural schematic diagram of the finished product of the metal tensile lap shear specimen described in the embodiment of the present invention is shown.

[0021] In the figure, 1 - base, 2 - cold inlaying mold, 21 - chamber, 22 - opening, 23 - filling port, 3 - plastic sealing medium, 4 - intermediate product of metal tensile lap shear specimen, 41 - sheet, 42 - lap zone, 5 - cold inlaying block. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] Hereinafter, the embodiments of the present invention will be described with reference to the accompanying drawings and preferred embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be understood that the preferred embodiments are only for explaining the present invention, rather than for limiting the protection scope of the present invention.

[0023] In one embodiment, see Figure 1As shown, a manufacturing device for a metal tensile lap shear specimen is disclosed, which includes a base 1 and two cold mounting molds 2 fixed on the base 1; the chambers 21 of the two cold mounting molds 2 are symmetrically arranged, and the chamber 21 of a single cold mounting mold 2 includes an opening 22 and a filling port 23. The openings 22 of the chambers of the two cold mounting molds 2 are arranged opposite to each other. The intermediate product 4 of the metal tensile lap shear specimen is located between the two chambers 21, and the end of the sheet 41 of the intermediate product 4 of the metal tensile lap shear specimen extends into the chamber 21 through the opening 22; a plastic sealing medium 3 is arranged between the inner wall of the opening 22 and the end of the sheet 41. Cold mounting agent is filled into the chamber 21 through the filling port 23, and after the cold mounting agent is cured, a cold mounting block 5 fixedly connected to the end of the sheet 41 is formed; the thickness a of the chamber 21 is greater than the thickness b of the intermediate product 4 of the metal tensile lap shear specimen.

[0024] During the traditional specimen manufacturing and tensile test processes, it is very easy to generate a component of force in the normal direction of the welding interface when clamping the specimen. This component of force will damage the welding interface of the metal tensile lap shear specimen during axial tension, which may cause the specimen to kink during the tensile process, thus affecting the accuracy of the test results. In the present invention, the cold mounting block 5 formed after the cold mounting agent is cured serves as an installation part fixedly connected to the fixture supporting the tensile testing machine. The cold mounting block 5 can evenly transfer the force applied by the fixture to the specimen, avoiding the generation of a component of force in the normal direction of the welding interface, thereby fundamentally eliminating the damaging effect of the component of force in the normal direction of the welding interface of the metal tensile lap shear specimen during axial tension, and effectively avoiding the kinking of the specimen during axial tension.

[0025] Due to eliminating the damaging effect of the component of force in the normal direction of the welding interface, the metal tensile lap shear specimen manufactured by the present invention can more truly reflect the mechanical properties of the specimen during the axial tensile test. In traditional tests, kinking or other abnormal deformations of the specimen caused by the component of force will cause deviations in the test data and cannot accurately reflect the actual strength and performance of the specimen. The present invention can obtain more accurate and reliable test data by optimizing the manufacturing device, providing strong support for the performance research and engineering application of metal materials.

[0026] The manufacturing device described in the present invention has a relatively simple structure, high reliability, relatively less maintenance work, and low maintenance cost.

[0027] As a preferred embodiment of the present invention, see Figure 2 and Figure 3As shown, the cold inlay mold 2 includes a bottom plate and at least one side plate fixed to the bottom plate. The bottom plate and the side plate enclose a chamber 21. This modular construction method ensures the consistency of the structures of the two side chambers 21 under a symmetrical layout, further ensuring that the thickness of the cold inlay block 5 is the same, and avoiding the generation of force components in the normal direction of the welding interface of the specimen when clamping the specimen.

[0028] As a preferred embodiment of the present invention, referring to Figure 2 and Figure 3 As shown, the chamber 21 is in the shape of a cuboid. The top surface of the chamber 21 penetrates through the cold inlay mold 2 to form a filling port 23, and an opening 22 through which the end of the sheet 41 accommodating the intermediate product 4 of the metal tensile lap shear specimen passes is formed on one side surface in the length direction of the chamber 21. Exemplarily, the length c of the cuboid-shaped chamber is 10 - 50 mm, the thickness a (i.e., the width) is 1 - 10 mm, and the height d is 10 - 20 mm. The cuboid-shaped chamber 21 has a simple and regular structure. During the processing and manufacturing of the mold, it is easier to ensure dimensional accuracy and surface quality. Compared with other complex shapes, the processing difficulty of the cuboid chamber is lower, which can reduce production costs and improve production efficiency. At the same time, the regular structure is also convenient for subsequent maintenance and repair.

[0029] The cuboid chamber 21 is also conducive to the uniform filling of the cold inlay agent. When filling the cold inlay agent, the cold inlay agent can flow and distribute smoothly in the cuboid chamber 21, reducing the accumulation or insufficient filling of the cold inlay agent caused by the irregular shape of the chamber, helping to ensure the uniform quality of the cold inlay block 5, improving the connection strength between the cold inlay block 5 and the end of the sheet 41, and thus providing a more reliable specimen for the tensile test.

[0030] The top surface of the chamber 21 penetrates to form the filling port 23, providing a direct and convenient channel for injecting the cold inlay agent. The operator can directly inject the cold inlay agent into the chamber 21 from above without complex operation steps, improving the injection efficiency of the cold inlay agent. At the same time, this design is also convenient for controlling the injection amount of the cold inlay agent to ensure that the chamber 21 can be fully filled.

[0031] Injecting the cold inlay agent from the top surface is also conducive to the discharge of air. During the injection process, air can be discharged from the chamber 21 from above along with the flow of the cold inlay agent, reducing the possibility of air remaining in the chamber 21. The remaining air may cause bubbles inside the cold inlay block 5, affecting the quality and performance of the cold inlay block 5. And this design of the top filling port 23 can effectively avoid this problem, improving the density and reliability of the cold inlay block 5.

[0032] Since the filling port 23 is on the top surface, the operator can visually observe the filling condition of the cold embedding agent. During the injection process, it can be timely discovered whether the cold embedding agent has filled the chamber 21 or whether there is uneven filling, so as to make timely adjustment and treatment to ensure the production quality of the cold embedding block 5.

[0033] An opening 22 is formed through one side surface in the length direction of the chamber 21, which facilitates the end of the sheet 41 of the intermediate product 4 of the metal tensile lap shear specimen to pass through and extend into the chamber 21. With such a setting, the installation of the end of the sheet 41 is simpler and faster, reducing the difficulty and time cost during the installation process. At the same time, the position and size of the opening 22 can be adjusted according to the specific specifications of the sheet 41, improving the adaptability of the device to different sheets. The setting of the opening 22 helps to accurately determine the position of the sheet 41 in the chamber 21. After the end of the sheet 41 extends into the chamber 21 through the opening 22, it can better align with the inner wall of the chamber 21, ensuring the accurate position of the sheet during the tensile test. This is very important for improving the accuracy and reliability of the test results and can avoid test errors caused by the position deviation of the sheet 41.

[0034] The existence of the opening 22 provides a reasonable space for the installation of the plastic sealant medium 3. The plastic sealant medium 3 is installed between the inner wall of the opening 22 and the end of the sheet 41 to form an effective seal to prevent the cold embedding agent from leaking. At the same time, since the opening 22 is on the side, the installation and adjustment of the plastic sealant medium 3 are more convenient, enabling it to better play its sealing role and ensuring the production quality of the cold embedding block 5.

[0035] As a preferred embodiment of the present invention, refer to Figure 3 As shown, the length e of the opening 22 is less than or equal to the thickness a of the chamber 21; the height f of the opening 22 is less than or equal to the height d of the chamber 21.

[0036] Such a setting of the opening size is more convenient in actual operation. When the operator installs the end of the sheet 41 and the plastic sealant medium 3, the smaller opening 22 is easier to operate, which can improve work efficiency. Moreover, after the test, it is relatively easier to clean the residual cold embedding agent and plastic sealant medium 3 at the chamber 21 and the opening 22, reducing the difficulty and workload of maintenance, and being beneficial to improving the use efficiency and service life of the device.

[0037] As a preferred embodiment of the present invention, the plastic sealant medium 3 is plasticine, silicone clay or paraffin.

[0038] These several materials (plasticine, silicone clay, and paraffin wax) all have excellent plasticity and can be easily adjusted according to the shape of the specimen and the cold mounting mold 2. When installing the specimen, the operator can press it between the inner wall of the opening 22 and the end of the sheet 41 to make it fit tightly, fill the gap, and effectively prevent the leakage of the cold mounting agent. For example, plasticine can be kneaded into various shapes at will to perfectly fill irregular gaps and ensure the sealing effect.

[0039] The plastic sealing medium 3 can form an effective seal between the inner wall of the opening 22 and the end of the sheet 41, preventing the cold mounting agent from leaking out of the chamber 21. Whether it is silicone clay or paraffin wax, after filling, a continuous and gapless sealing layer can be formed to ensure that the cold mounting agent will not be lost during the curing process, thereby ensuring the forming quality of the cold mounting block 5 and the connection strength with the end of the sheet 41.

[0040] Plasticine, silicone clay, and paraffin wax usually have good chemical stability and will not chemically react with the cold mounting agent or the metal sheet. This helps to maintain the performance of the cold mounting agent and the surface characteristics of the metal sheet, avoiding material property changes or corrosion problems caused by chemical reactions, and ensuring the accuracy and reliability of specimen production.

[0041] After the cold mounting agent cures, these plastic sealing media 3 are easy to remove from the specimen and the mold. For example, paraffin wax is solid at room temperature and can be softened and easily peeled off with a little heating; silicone clay and plasticine can also be removed by simple methods such as tearing or wiping by hand, without leaving residues on the specimen or the mold, which is convenient for subsequent processing and cleaning of the specimen and the mold.

[0042] These several materials are relatively common in the market and have relatively low prices, which can reduce the use cost of the metal tensile lap shear specimen manufacturing device. At the same time, they are relatively easy to obtain and do not require special procurement channels or complex preparation processes, which is conducive to wide application and promotion.

[0043] As a preferred embodiment of the present invention, the inner wall of the plastic sealing medium 3 close to the chamber 21 is flush with the inner wall of the chamber 21.

[0044] This flush design ensures the regularity of the filling space of the cold mounting agent in the chamber 21, enabling the cold mounting agent to be more evenly distributed when injected into the chamber. It avoids the situation where the flow of the cold mounting agent is uneven due to misalignment or steps between the plastic sealing medium 3 and the inner wall of the chamber 21, which is beneficial to improving the forming quality of the cold mounting block 5 and ensuring the performance consistency of the cold mounting block 5 in all directions.

[0045] The flat inner wall enables the plastic sealing medium 3 to better fit the inner wall of the chamber 21, reducing the gap between the two. This helps to more effectively prevent the cold inlay agent from leaking from the opening, ensuring that the cold inlay agent fully cures within the chamber 21 to form a complete and firm cold inlay block 5, providing a reliable basis for fixing the specimen in the subsequent tensile test.

[0046] Moreover, with such a setting, it is more convenient to install the plastic sealing medium 3 and perform subsequent operations such as cleaning the mold. Due to the flat inner wall, the installation position of the plastic sealing medium 3 is more clearly defined, reducing the operation difficulty; at the same time, after the test, it is also easier to clean the residual plastic sealing medium 3 and cold inlay agent, reducing the cleaning time and workload and improving the work efficiency.

[0047] As a preferred embodiment of the present invention, the cold inlay mold 2 is made of soft silicone, and the material of the sheet 41 includes iron, steel, aluminum, aluminum alloy, copper, copper alloy, magnesium, magnesium alloy, titanium, titanium alloy, lithium, lithium alloy, zirconium or zirconium alloy.

[0048] The soft silicone material has excellent flexibility and can, to a certain extent, adapt to the shape and size changes of the end of the sheet 41. When the end of the sheet 41 extends into the chamber 21 of the cold inlay mold 2, the soft silicone can closely fit the sheet 41. Even if there are certain irregularities on the surface of the sheet 41, it can ensure a good sealing effect and prevent the cold inlay agent from leaking. This is applicable to sheets 41 with different shapes and surface conditions, improving the versatility of the device.

[0049] After the cold inlay agent cures, the soft silicone mold has a certain elasticity, making it easier to separate the cold inlay block 5 from the mold. During the demolding process, no large external force is required, reducing the risk of damage to the cold inlay block 5 and at the same time improving the efficiency of specimen production. The operator can more easily remove the cold inlay block 5 from the mold for subsequent test operations.

[0050] Soft silicone has good chemical stability and is not easily chemically reactive with the cold inlay agent and various metal sheets 41. This ensures that during the process of making the specimen, the mold will not have an adverse effect on the curing process of the cold inlay agent and the performance of the sheet 41. Whether it is for common metals such as iron and steel, or light metals such as aluminum, magnesium, titanium and their alloys, the soft silicone mold can maintain stable performance, ensuring the reliability of the test.

[0051] The material piece 41 covers material pieces of various materials such as iron, steel, aluminum, aluminum alloy, copper, copper alloy, magnesium, magnesium alloy, titanium, titanium alloy, lithium, lithium alloy, zircon or zircon alloy, etc., enabling the metal tensile lap shear specimen manufacturing device to be applicable to the material property tests in different fields and industries. For example, in the aerospace field, it can be used to test the properties of materials such as titanium alloy and aluminum alloy; in the electronics industry, it can test metals such as copper and aluminum and their alloys; in the automotive manufacturing field, it can conduct tensile lap shear tests on materials such as steel and magnesium alloy, meeting the diverse material research and engineering application requirements.

[0052] The diverse material of the material piece 41 provides convenient conditions for researchers and engineers to conduct comparative studies. By conducting tensile lap shear tests on material pieces 41 of different materials under the same conditions, the mechanical property differences of various metals and their alloys can be deeply understood, providing a basis for material selection and optimization. For example, comparing the properties of aluminum and aluminum alloy helps to determine the more suitable material in different application scenarios and improve the quality and performance of products.

[0053] In one embodiment, the present invention also discloses a method for manufacturing a metal tensile lap shear specimen, which is manufactured by using the metal tensile lap shear specimen manufacturing device described in any of the above embodiments, including: Providing an intermediate product 4 of a metal tensile lap shear specimen, as shown in Figure 4 The intermediate product 4 of the metal tensile lap shear specimen includes two lap-fixed material pieces 41, and the connection position of the two material pieces 41 is the lap zone 42.

[0054] Insert the ends of the material pieces 41 at both ends of the intermediate product 4 of the metal tensile lap shear specimen respectively through the openings 22 of the two cold mounting molds 2 and extend them into the chamber 21.

[0055] Use a plastic sealing medium 3 to seal the gap between the inner wall of the opening 22 and the ends of the material pieces 41.

[0056] Fill the chamber 21 with a cold mounting agent through the filling port 23, and after the cold mounting agent solidifies, a cold mounting block 5 fixedly connected to the ends of the material pieces 41 is formed.

[0057] Take out to obtain a finished product of the metal tensile lap shear specimen, as shown in Figure 5 shown.

[0058] The present invention uses the cold mounting block 5 as the installation part fixedly connected to the fixture supporting the tensile testing machine, avoiding the generation of force components in the normal direction of the welding interface when clamping the specimen. This effectively eliminates the damaging effect of the component force in the normal direction of the welding interface of the metal tensile lap shear specimen during axial tension, avoids the specimen from kinking during axial tension, ensures the integrity and accuracy of the specimen during the test, and enables the test results to truly reflect the mechanical properties of the material.

[0059] The cold inlay block 5 formed after the cold inlay agent cures is fixedly and tightly connected to the end of the material piece 41. When the cold inlay agent cures in the chamber 21, it can fully fill the space around the end of the material piece 41 and form a firm mechanical bite with the material piece 41. This connection method can withstand a large tensile force and is not prone to the separation of the cold inlay block 5 and the material piece 41 during the tensile test, ensuring the reliability and stability of the specimen.

[0060] As a preferred embodiment of the present invention, when the thickness of the material piece 41 is 1 - 2 mm, the length of the end of the material piece 41 extending into the interior of the chamber 21 is 10 - 20 mm; When the thickness of the material piece 41 is 2 - 3 mm, the length of the end of the material piece 41 extending into the interior of the chamber 21 is 20 - 30 mm; When the thickness of the material piece 41 is 3 - 4 mm, the length of the end of the material piece 41 extending into the interior of the chamber 21 is 30 - 50 mm.

[0061] With such a setting, it ensures that the cold inlay agent has sufficient contact area and anchoring length with the ends of the material pieces 41 of different thicknesses, thereby forming a more firm connection. The thicker material piece 41 requires a longer length of the end extending in, so that the cold inlay block 5 can better transfer the tensile force and prevent the material piece 41 from detaching from the cold inlay block 5 during the test, ensuring the reliability and stability of the specimen.

[0062] In one embodiment, the present invention discloses a metal tensile lap shear specimen, which is prepared by using the manufacturing method of the metal tensile lap shear specimen described in any of the above embodiments. It includes two material pieces 41 that are lap-fixed, and cold inlay blocks 5 are fixed at the ends of the material pieces 41 away from the lap zone 42. The thicknesses of the cold inlay blocks 5 on the two material pieces 41 are the same to eliminate the torque generated due to the lap misalignment of the specimen during the clamping process of the tensile test.

[0063] The following is an analysis and explanation with specific examples.

[0064] Example 1: A metal tensile lap shear specimen is manufactured by using the manufacturing device of the present invention. The material of the cold inlay mold is soft silicone, and the materials of the two material pieces are aluminum alloy and magnesium alloy respectively. The length of the intermediate product of the metal tensile lap shear specimen is 160 mm, the width is 10 mm, and the thickness is 1 mm.

[0065] The cold mounting mold is a cuboid structure without a cover on the top surface, and the thicknesses of the bottom surface and the side surfaces are equal, both being 3 mm. The length c of the internal chamber space of the cold mounting mold is 10 mm, the thickness a is 1 mm, and the height d is 10 mm. The opening of the cold mounting mold is a cuboid through-hole groove located on the side surface with a smaller area of the mold. The length e of the opening is 1 mm, and the height f of the opening is 10 mm. Since the thickness of the specimen is 1 mm, the length of the end of the strip inserted into the cold mounting mold is 10 mm.

[0066] Use plasticine to seal the gap between the inner wall of the opening and the end of the strip.

[0067] Fill the chamber with cold mounting agent through the filling port. After the cold mounting agent solidifies, a cold mounting block fixedly connected to the end of the strip is formed. When pouring the cold mounting agent into the cold mounting mold, it should be kept slow and uniform to avoid generating bubbles; take it out to obtain the finished product of the metal tensile lap shear specimen.

[0068] Conduct an axial tensile test on the finished product of the metal tensile lap shear specimen, and the measured tensile lap shear load is 2263 N.

[0069] For Comparative Example 1, provide an intermediate product of the metal tensile lap shear specimen. The materials of the two strips of the intermediate product of the metal tensile lap shear specimen are aluminum alloy and magnesium alloy respectively. The length of the intermediate product of the metal tensile lap shear specimen is 160 mm, the width is 10 mm, and the thickness is 1 mm. Directly conduct an axial tensile test on the intermediate product of the metal tensile lap shear specimen, and the measured tensile lap shear load is 2216 N.

[0070] In Example 2, use the manufacturing device described in the present invention to manufacture a metal tensile lap shear specimen. The material of the cold mounting mold is soft silicone, and the materials of the two strips are aluminum alloy and magnesium alloy respectively. The length of the intermediate product of the metal tensile lap shear specimen is 160 mm, the width is 10 mm, and the thickness is 2 mm.

[0071] The cold mounting mold is a cuboid structure without a cover on the top surface, and the thicknesses of the bottom surface and the side surfaces are equal, both being 3 mm. The length c of the internal chamber space of the cold mounting mold is 20 mm, the thickness a is 5 mm, and the height d is 15 mm. The opening of the cold mounting mold is a cuboid through-hole groove located on the side surface with a smaller area of the mold. The length e of the opening is 5 mm, and the height f of the opening is 15 mm. Since the thickness of the specimen is 2 mm, the length of the end of the strip inserted into the cold mounting mold is 20 mm.

[0072] Use plasticine to seal the gap between the inner wall of the opening and the end of the strip.

[0073] Fill the chamber with cold embedding agent through the filling port. After the cold embedding agent solidifies, a cold embedding block fixedly connected to the end of the specimen piece is formed. When pouring the cold embedding agent into the cold embedding mold, it should be poured slowly and evenly to avoid generating bubbles; take it out to obtain the finished product of the metal tensile lap shear specimen.

[0074] Conduct an axial tensile test on the finished product of the metal tensile lap shear specimen, and the measured tensile lap shear load is 2452 N.

[0075] For Comparative Example 2, provide an intermediate product of the metal tensile lap shear specimen. The materials of the two specimen pieces of the intermediate product of the metal tensile lap shear specimen are aluminum alloy and magnesium alloy respectively. The length of the intermediate product of the metal tensile lap shear specimen is 160 mm, the width is 10 mm, and the thickness is 2 mm. Directly conduct an axial tensile test on the intermediate product of the metal tensile lap shear specimen, and the measured tensile lap shear load is 2355 N.

[0076] Example 3, use the manufacturing device of the present invention to manufacture a metal tensile lap shear specimen. The material of the cold embedding mold is soft silicone, and the materials of the two specimen pieces are aluminum alloy and magnesium alloy respectively. The length of the intermediate product of the metal tensile lap shear specimen is 160 mm, the width is 10 mm, and the thickness is 4 mm.

[0077] The cold embedding mold is a cuboid structure with no cover on the top surface, and the thicknesses of the bottom surface and the side surfaces are equal, both being 3 mm. The length c of the internal chamber space of the cold embedding mold is 50 mm, the thickness a is 10 mm, and the height d is 20 mm. The opening of the cold embedding mold is a cuboid through-hole groove, located on the side surface with a smaller area of the mold. The length e of the opening is 10 mm, and the height f of the opening is 20 mm. Since the thickness of the specimen is 4 mm, the length of the end of the specimen piece extending into the cold embedding mold is 50 mm.

[0078] Use plasticine to seal the gap between the inner wall of the opening and the end of the specimen piece.

[0079] Fill the chamber with cold embedding agent through the filling port. After the cold embedding agent solidifies, a cold embedding block fixedly connected to the end of the specimen piece is formed. When pouring the cold embedding agent into the cold embedding mold, it should be poured slowly and evenly to avoid generating bubbles; take it out to obtain the finished product of the metal tensile lap shear specimen.

[0080] Conduct an axial tensile test on the finished product of the metal tensile lap shear specimen, and the measured tensile lap shear load is 2276 N.

[0081] Comparative Example 3: A metal tensile lap shear specimen intermediate product was provided. The two sheets of the metal tensile lap shear specimen intermediate product were made of an aluminum alloy and a magnesium alloy, respectively. The metal tensile lap shear specimen intermediate product had a length of 160 mm, a width of 10 mm, and a thickness of 4 mm. The metal tensile lap shear specimen intermediate product was directly subjected to an axial tensile test, and the measured tensile lap shear load was 2087 N.

[0082] In Example 4, a metal tensile lap shear specimen was produced using the apparatus described herein. The cold-mounting mold was made of soft silicone, and the two blanks were made of aluminum alloy and copper alloy, respectively. The resulting intermediate metal tensile lap shear specimen had a length of 160 mm, a width of 10 mm, and a thickness of 2 mm.

[0083] The cold-mounting mold is a rectangular parallelepiped structure with an uncovered top surface. The bottom and sides have equal thicknesses of 3 mm. The length c of the internal cavity of the cold-mounting mold is 20 mm, the thickness a is 5 mm, and the height d is 15 mm. The opening of the cold-mounting mold is a rectangular through-hole slot located on the smaller side of the mold. The length e of the opening is 5 mm, and the height f is 15 mm. Because the sample is 2 mm thick, the end of the sheet extending into the cold-mounting mold is 20 mm long.

[0084] The gap between the inner wall of the opening and the end of the sheet is sealed with plasticine.

[0085] The cavity is filled with cold mounting agent through the filling port. Once the cold mounting agent solidifies, it forms a cold mounting block that is securely connected to the end of the blank. The cold mounting agent should be poured into the cold mounting mold slowly and evenly to avoid creating bubbles. The finished metal tensile lap shear specimen is then removed.

[0086] The finished metal tensile lap shear specimen was subjected to an axial tensile test, and the measured tensile lap shear load was 2510N.

[0087] Comparative Example 4 provides a metal tensile lap shear specimen intermediate product. The two sheets of the metal tensile lap shear specimen intermediate product are made of an aluminum alloy and a copper alloy, respectively. The metal tensile lap shear specimen intermediate product has a length of 160 mm, a width of 10 mm, and a thickness of 2 mm. The metal tensile lap shear specimen intermediate product was directly subjected to an axial tensile test, and the measured tensile lap shear load was 2406 N.

[0088] In Example 5, a metal tensile lap shear specimen was produced using the apparatus described herein. The cold-mounting mold was made of soft silicone, and the two blanks were made of aluminum alloy and steel, respectively. The resulting intermediate metal tensile lap shear specimen had a length of 160 mm, a width of 10 mm, and a thickness of 2 mm.

[0089] The cold embedding mold is a cuboid structure without a cover on the top surface. The thicknesses of the bottom surface and the side surfaces are equal, both being 3 mm. The length c of the internal chamber space of the cold embedding mold is 20 mm, the thickness a is 5 mm, and the height d is 15 mm. The opening of the cold embedding mold is a cuboid through-hole groove located on the side surface with a smaller area of the mold. The length e of the opening is 5 mm, and the height f of the opening is 15 mm. Since the thickness of the specimen is 2 mm, the length of the end of the sheet material extending into the cold embedding mold is 20 mm.

[0090] Use plasticine to seal the gap between the inner wall of the opening and the end of the sheet material.

[0091] Fill the chamber with cold embedding agent through the filling port. After the cold embedding agent cures, a cold embedding block is formed that is fixedly connected to the end of the sheet material. When pouring the cold embedding agent into the cold embedding mold, it should be kept slow and uniform to avoid generating bubbles; take it out to obtain the finished product of the metal tensile lap shear specimen.

[0092] Conduct an axial tensile test on the finished product of the metal tensile lap shear specimen, and the measured tensile lap shear load is 2433 N.

[0093] Comparative Example 5 provides an intermediate product of a metal tensile lap shear specimen. The materials of the two sheet materials of the intermediate product of the metal tensile lap shear specimen are aluminum alloy and steel respectively. The length of the intermediate product of the metal tensile lap shear specimen is 160 mm, the width is 10 mm, and the thickness is 2 mm. Directly conduct an axial tensile test on the intermediate product of the metal tensile lap shear specimen, and the measured tensile lap shear load is 2325 N.

[0094] Based on the test results of the above examples and comparative examples, it is not difficult to find that the tensile lap shear load measured during the axial tensile test of the finished product of the metal tensile lap shear specimen produced by using the manufacturing method and device of the present invention is higher than that measured during the axial tensile test of the corresponding intermediate product of the metal tensile lap shear specimen directly. This is because there is a lap misalignment between the two sheet materials of the metal tensile lap shear specimen, that is, the two sheet materials are not in the same plane. At present, the clamps supporting the tensile testing machine are all symmetric structures. When the clamp of the tensile testing machine clamps the specimen, a component of force will inevitably be generated in the normal direction of the welding interface, causing immeasurable damage to the interface bonding state, such as the initiation and propagation of interface microcracks, and this damage effect will increase with the increase in the thickness of the specimen. The manufacturing method and device of the present invention avoid generating a component of force in the normal direction of the welding interface when clamping the specimen by adding symmetric cold embedding blocks at the ends of the sheet materials of the specimen, so as to eliminate the damage effect of the component force in the normal direction of the welding interface of the metal tensile lap shear specimen during axial tension and avoid the specimen from kinking during axial tension.

[0095] The above embodiments are only preferred embodiments given to fully illustrate the present invention, and the protection scope of the present invention is not limited thereto. Equivalent substitutions or transformations made by those skilled in the art in the technical field on the basis of the present invention are all within the protection scope of the present invention.

Claims

1. A manufacturing device for a metal tensile lap shear specimen, characterized in that: It includes a base and two cold inlay molds fixed on the same plane of the base; The chambers of the two cold inlay molds are symmetrically arranged. The chamber of a single cold inlay mold includes an opening and a filling port. The openings of the chambers of the two cold inlay molds are arranged opposite to each other. The intermediate product of the metal tensile lap shear specimen is located between the two chambers, and the end of the sheet of the intermediate product of the metal tensile lap shear specimen passes through the opening and extends into the chamber; a plastic sealant medium is arranged between the inner wall of the opening and the end of the sheet; Cold inlay agent is filled into the chamber through the filling port, and after the cold inlay agent solidifies, a cold inlay block fixedly connected to the end of the sheet is formed; The thickness of the chamber is greater than the thickness of the intermediate product of the metal tensile lap shear specimen.

2. The manufacturing device of the metal tensile lap shear specimen according to claim 1, characterized in that: The cold inlay mold includes a bottom plate and at least one side plate fixed to the bottom plate, and the bottom plate and the side plate enclose to form a chamber.

3. The manufacturing device of the metal tensile lap shear specimen according to claim 1, characterized in that: The chamber is in a cuboid shape. The top surface of the chamber penetrates through the cold inlay mold to form a filling port, and one side surface in the length direction of the chamber penetrates through the cold inlay mold to form an opening for the end of the sheet of the intermediate product of the metal tensile lap shear specimen to pass through.

4. The manufacturing device of the metal tensile lap shear specimen according to claim 1, wherein: The length of the opening is less than or equal to the thickness of the chamber; the width of the opening is less than or equal to the height of the chamber.

5. The manufacturing device of the metal tensile lap shear specimen according to claim 1, characterized in that: The plastic sealant medium is plasticine, silicone clay or paraffin.

6. The manufacturing device of the metal tensile lap shear specimen according to claim 1, characterized in that: The inner wall of the plastic sealant medium close to the chamber side is flush with the inner wall of the chamber.

7. The manufacturing device of the metal tensile lap shear specimen according to claim 1, characterized in that: The material of the cold inlay mold is soft silicone, and the materials of the sheet include iron, steel, aluminum, aluminum alloy, copper, copper alloy, magnesium, magnesium alloy, titanium, titanium alloy, lithium, lithium alloy, zircon or zircon alloy.

8. A method for fabricating a metal tensile lap shear specimen, characterized in that: Manufacturing is carried out by using the manufacturing device for the metal tensile lap shear specimen as described in any one of claims 1 to 7, including: Providing an intermediate product of the metal tensile lap shear specimen, and the intermediate product of the metal tensile lap shear specimen includes two sheets lap-fixed; Respectively passing the ends of the sheets at both ends of the intermediate product of the metal tensile lap shear specimen through the openings of the two cold inlay molds and extending into the chamber; Sealing the gap between the inner wall of the opening and the end of the sheet by using a plastic sealant medium; Filling cold inlay agent into the chamber through the filling port, and after the cold inlay agent solidifies, a cold inlay block fixedly connected to the end of the sheet is formed; Taking out to obtain a finished metal tensile lap shear specimen.

9. The manufacturing method of the metal tensile lap shear specimen according to claim 8, characterized in that: When the thickness of the sheet is 1 - 2 mm, the length of the end of the sheet extending into the chamber is 10 - 20 mm; When the thickness of the sheet is 2 - 3 mm, the length of the end of the sheet extending into the chamber is 20 - 30 mm; When the thickness of the sheet is 3 - 4 mm, the length of the end of the sheet extending into the chamber is 30 - 50 mm.

10. A metal tensile lap shear specimen, characterized in that, Manufactured by using the manufacturing method for the metal tensile lap shear specimen as described in claim 8 or 9, including two sheets lap-fixed, and cold inlay blocks are fixed at the ends of the sheets away from the lap zone, and the thicknesses of the cold inlay blocks on the two sheets are the same to eliminate the torque generated by the specimen lap misalignment during the tensile test clamping process.

Images