Auxiliary tool for testing bonding strength of metal layered composite material

Abstract

The utility model discloses an auxiliary tool for testing the bonding strength of a metal layered composite material, which comprises a cylindrical sample locking mechanism, and an upper pull rod is connected to the central position of the upper part of the cylindrical sample locking mechanism; a T-shaped sample groove penetrating through the cylindrical side face of the sample locking mechanism is formed in the center of the lower portion of the sample locking mechanism and used for being connected with the upper portion of a sample. The auxiliary tool further comprises a lower pull rod, the upper portion of the lower pull rod is provided with a T-shaped through hole penetrating through the radial direction of the lower pull rod, and the T-shaped through hole is used for being connected with the lower portion of the sample. The auxiliary tool disclosed by the utility model is used for clamping a sample in the bonding strength testing process of a metal material and can prevent a metal composite layer of the material from being deformed or torn in the testing process.

Description

Technical Field

[0001] This utility model belongs to the technical field of metal material performance testing devices, and relates to an auxiliary tooling for testing the bonding strength of metal layered composite materials. Background Technology

[0002] With the development of industrial technology, layered metal composites have been widely used in petroleum, chemical, aerospace, automotive, shipbuilding, and power industries due to their excellent properties such as high strength, corrosion resistance, and wear resistance. These materials are composites formed by using unique and advanced processes to create a metallurgical bond between two or more metals at the metal interface. While the components of the material are independent, the final performance is not simply a superposition of the properties of each component, but rather represents a significant improvement. The bonding interface between metal layers with different properties, formed through specific processes, often becomes a weak point in the material's performance. Therefore, accurate testing of the bonding strength is crucial to ensuring the reliability and safety of these materials in practical use.

[0003] Currently, the main testing methods for the bonding strength of layered metal composite materials are GB / T6396-2008 "Test Methods for Mechanical and Technological Properties of Composite Steel Plates" and GB12948-91 "Destructive Test Method for Bimetallic Bond Strength of Sliding Bearings". GB / T6396-2008 uses static pressure and a corresponding bonding test device to subject the matrix and composite material to a normal tensile force perpendicular to the direction of the force on the annular bonding surface until fracture, thus determining the bonding strength. This method is only suitable for samples with relatively thick composite layers. If the composite layer is thin, deformation and tearing are likely to occur at stress concentration points, reducing the accuracy of the test results. GB12948-91 provides two methods for testing the bimetallic bond strength of sliding bearings: tensile testing and compression testing. The testing principle is the same as GB / T 6396-2008, both subjecting the annular bonding surface of the sample to tensile force until fracture. However, its tensile testing method uses a hinge device, requiring careful adjustment of the test device's position on the testing machine, resulting in complex tooling structure and a cumbersome testing process. Therefore, it is necessary to provide an auxiliary tooling for testing the bonding strength of metal layered composite materials with a simple structure, so as to reduce the deformation and tearing of the composite layer of the sample during the test and improve the accuracy of the test results. Utility Model Content

[0004] The purpose of this invention is to provide an auxiliary tooling for testing the bonding strength of metal layered composite materials, which is used to clamp the sample during the bonding strength test and can prevent the metal composite layer of the material from deforming or tearing during the test.

[0005] The technical solution adopted in this utility model is:

[0006] An auxiliary fixture for testing the bonding strength of layered metal composite materials includes a cylindrical specimen locking mechanism with an upper pull rod connected to the center of its upper part; a T-shaped specimen groove penetrating the cylindrical side of the lower part of the specimen locking mechanism is provided at the center of its lower part, and the T-shaped specimen groove is used to connect with the upper part of the specimen; the auxiliary fixture also includes a lower pull rod with a T-shaped through hole penetrating its radial direction at the upper part of the lower pull rod, and the T-shaped through hole is used to connect with the lower part of the specimen.

[0007] The features of this utility model also include:

[0008] Two handles at 180° angles are fixed to the circumferential surface on the side of the sample locking mechanism.

[0009] The upper part of the sample locking mechanism has a threaded hole along the axial direction at its center, and the upper pull rod is connected to the sample locking mechanism through the threaded hole.

[0010] The overall longitudinal section of the sample is an inverted "I" shape with a longer top and shorter bottom.

[0011] The sample consists of a metal composite layer and a base metal, with the contact area between the two being the bonding surface.

[0012] The upper transverse portion of the sample is a metal composite layer with a circular or racetrack-shaped cross-section; the middle portion of the sample is a slender cylindrical structure, and the lower portion is a flat cylindrical structure. The head and the lower portion constitute the base metal.

[0013] The shape and size of the T-shaped sample groove are adapted to the upper part of the sample.

[0014] The shape and size of the T-shaped through hole are adapted to the lower half of the sample.

[0015] The beneficial effects of this utility model are:

[0016] (1) The tooling of this utility model fixes the metal composite layer of the sample in the T-shaped sample groove of the locking mechanism through the upper pull rod, the sample locking mechanism and the handle, which strengthens the strength of the metal composite layer, avoids the slippage, deformation or tearing of the metal composite layer during the test, and improves the test efficiency and accuracy.

[0017] (2) The tooling of this utility model fixes the sample by means of the upper pull rod and the lower pull rod, which can make the force axis of the sample coincide with the force axis of the testing machine, thereby improving the accuracy of the test results;

[0018] (3) The tooling structure of this utility model is simple and compact, and can test the bonding strength of different types of metal layered composite materials. The required samples can be directly selected from the body without the need for special process preparation, and the tooling has high applicability. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the sample in this utility model;

[0020] Figure 2 This is a top view of the sample in this utility model;

[0021] Figure 3 This is a schematic diagram of the structure of the testing auxiliary tooling of this utility model.

[0022] In the figure, 1. upper pull rod, 2. sample locking mechanism, 3. handle, 4. sample, 41. metal composite layer, 42. bonding surface, 43. base metal, 5. lower pull rod. Detailed Implementation

[0023] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0024] Example 1:

[0025] This utility model relates to an auxiliary tooling for testing the bonding strength of layered metal composite materials. It is used to clamp and fix the sample during the bonding strength testing of metal materials. The sample structure is as follows: Figure 1 and Figure 2 As shown, the overall longitudinal section of the sample is an inverted "I" shape, longer at the top and shorter at the bottom. The upper, longer, transverse portion is the metal composite layer 41, with a circular or racetrack-shaped transverse section. The middle section is a slender cylindrical structure, which is a parallel segment of the base metal 43. The lower section is a flattened cylindrical structure, also part of the base metal 43, used for connection with auxiliary tooling. The contact area between the metal composite layer 41 and the base metal 43 is the bonding surface 42. During testing, the sample breaks at the bonding surface 42, thus allowing the measurement of the bonding strength of the metal layered composite material.

[0026] The sample can be processed according to the following dimensions:

[0027] The diameter at the root of the specimen bonding surface (i.e., the diameter of the parallel section of the base metal) d is (3±0.03) mm; the length of the parallel section h is (8±0.1) mm; the thickness of the metal composite layer a ≥ 1.5 mm; the length of the base metal... l ≥20mm.

[0028] Samples were obtained by wire cutting and machined along the mating surface using a lathe. When the mating surface of the metal layered composite material could not be clearly identified, a metallographic etchant could be used to wipe the side of the sample. The surface roughness of the sample testing area was better than 1.6.

[0029] This utility model relates to an auxiliary tooling for testing the bonding strength of metal layered composite materials, the structure of which is as follows: Figure 3As shown, the device includes a cylindrical sample locking mechanism 2 with two handles 3 fixed at 180° angles to its circumferential surface. A threaded hole is axially arranged at the center of the upper part of the handle, and a T-shaped sample groove penetrating the cylindrical side is arranged at the center of the lower part. The shape and size of the T-shaped sample groove are adapted to the upper half of the sample 4. In use, the upper half of the sample 4 is placed inside the T-shaped sample groove. An upper pull rod 1 is connected to the upper part of the sample locking mechanism 2 via a threaded hole. The auxiliary fixture also includes a lower pull rod 5, which is located below the sample locking mechanism 2. A T-shaped through hole is radially arranged on the upper part of the lower pull rod 5. The shape and size of this T-shaped through hole are adapted to the lower half of the sample 4. In use, the lower half of the sample 4 is placed inside the T-shaped through hole.

[0030] Both the upper and lower tie rods are made of alloy structural steel, which has sufficiently high strength.

[0031] Example 2:

[0032] Based on Example 1, in use, the tooling of this utility model first connects the upper pull rod 1 to the testing machine, then places the sample 4 in the T-shaped sample groove of the sample locking mechanism 2, aligns the threaded hole of the sample locking mechanism 2 with the upper pull rod 1, and rotates the handle 3 in the horizontal plane. The sample locking mechanism 2 moves upward under the action of the thread until the metal composite layer 41 of the sample 4 contacts the bottom of the upper pull rod 1, thus achieving a tight connection between the upper pull rod 1, the sample locking mechanism 2, and the sample 4. Afterwards, the lower pull rod 5 is moved, placing the lower half of the sample 4 into the T-shaped through hole of the lower pull rod 5, and then the lower pull rod 5 is connected to the testing machine to perform the bonding strength test. During the test, the metal composite layer 41 is pressed tightly within the T-shaped sample groove, so the composite layer will not deform or tear when the material is stretched.

[0033] Example 3:

[0034] Based on Example 2, the specific method for testing the bonding strength of metal layered composite materials using the tooling of this utility model is as follows:

[0035] (1) The testing machine used is an electronic universal testing machine with a load accuracy class of 0.5. The load range of the testing machine covers the breaking load of the test specimen for the bonding strength test of the metal layered composite material, and is within the accuracy class range of 0.5.

[0036] (2) Clamp the upper pull rod 1 in the jaws of the universal testing machine, use V-type jaws to clamp it, apply an appropriate load to prevent the pull rod from slipping during the test.

[0037] Place the test sample 4 into the T-shaped sample slot of the test sample locking mechanism 2, and rotate the handle 3 to make the upper pull rod 1 firmly connected to the test sample locking mechanism 2 and the test sample 4.

[0038] (3) Zero the initial load of the testing machine.

[0039] (4) Suspend the pull rod 5 below the specimen 4, move the crossbeam, adjust the position of the specimen, and make the force axis of the specimen coincide with the force axis of the testing machine as much as possible. Use the lower jaw of the testing machine to clamp the pull rod 5.

[0040] (5) Set test parameters:

[0041] The test method was tensile mode; the beam displacement rate was (1~3) mm / min; the acquisition frequency was set to 30Hz; and a preload of no more than 2% of the failure load of the specimen was applied to the shear surface of the specimen.

[0042] (6) Start the test. The load changes with the displacement of the crossbeam until the specimen breaks. Obtain the maximum load at which the specimen breaks and calculate the bonding strength of the material.

[0043] Example 4:

[0044] Based on Example 2, the bonding strength of the interface between the copper-steel layered composite metal material (ZCuPb10Sn10+42CrMoA) was tested. The layering process was casting. The sample dimensions were: interface diameter... d The length of the parallel section of the sample is (3±0.03) mm, the length of the parallel section is (8±0.1) mm, and the thickness of the metal composite layer is (3±0.03) mm. h The length of the sample is (2.5±0.1) mm; the length of the base metal is 30±1 mm. The upper pull rod is clamped in the testing machine jaws. The sample is placed in the T-slot, the load is set to zero, the lower pull rod is suspended, the testing machine beam is moved, and the sample position is adjusted so that the force axis of the sample coincides as closely as possible with the force axis of the testing machine. The lower pull rod is clamped, the testing machine beam is finely adjusted, and an initial load of 40 N is applied before testing. The testing rate is 3 mm / min, the data acquisition frequency is 30 Hz, and the load change is observed until the sample breaks, obtaining the maximum breaking load. F m The test results are shown in Table 1:

[0045] Table 1. Test results of bonding strength of ZCuPb10Sn10+42CrMoA composite material

[0046]

[0047] Example 5:

[0048] Based on Example 2, the shear strength of the bonding surface of a copper-steel bimetallic composite material (ZQSb3.5-20+42CrMoA) was tested using a layered casting process. The sample dimensions were: bonding surface diameter... d The length of the parallel section of the sample is (3±0.03) mm, and the thickness of the metal composite layer is (8.00±0.1) mm. hThe length of the base metal is (2.5±0.1) mm. l The value is 30±1 mm. The testing machine clamps the upper pull rod, places the specimen in the T-slot, sets the load to zero, suspends the lower pull rod, moves the testing machine beam, adjusts the specimen position so that the specimen's force axis coincides as closely as possible with the testing machine's force axis, clamps the lower pull rod, fine-tunes the testing machine beam, applies an initial load of 25 N, and runs the test at a rate of 1 mm / min and a data acquisition frequency of 30 Hz. Observe the load changes until the specimen breaks, obtaining the maximum breaking load. F m The test results are shown in Table 2:

[0049] Table 2 Test results of the bonding surface of ZQSb3.5-20+42CrMoA composite material

[0050]

[0051] Example 6:

[0052] Based on Example 2, the shear strength of the bonding surface of a copper-steel bimetallic composite material (ZCuSn12Ni2+42CrMoA) was tested using a layered casting process. The sample dimensions were: bonding surface diameter... d The length of the parallel section of the sample is (3.00±0.03) mm, the length of the parallel section is (8.00±0.1) mm, and the thickness of the metal composite layer is (3.00±0.03) mm. h The length of the base metal is (2.5±0.1) mm. l The value is 30±1 mm. The testing machine clamps the upper pull rod, places the specimen in the T-slot, sets the load to zero, suspends the lower pull rod, moves the testing machine beam, adjusts the specimen position so that the specimen's force axis coincides as closely as possible with the testing machine's force axis, clamps the lower pull rod, fine-tunes the testing machine beam, applies an initial load of 50N, and runs the test at a rate of 2mm / min and a data acquisition frequency of 30Hz. Observe the load changes until the specimen breaks, obtaining the maximum breaking load. F m The test results are shown in Table 3:

[0053] Table 3. Test results of bonding strength of ZCuSn12Ni2+42CrMoA composite material

[0054]

[0055] As can be seen from the test results of Examples 4-6, when the sample is fixed using the tooling of this utility model and the bonding strength test is performed, the standard deviation and relative standard deviation of the test results are both small, which improves the accuracy of the test results.

[0056] Example 7:

[0057] The auxiliary fixture for testing the bonding strength of metal layered composite materials in this embodiment includes a cylindrical sample locking mechanism 2, with an upper pull rod 1 connected to the center of its upper part; a T-shaped sample groove penetrating the cylindrical side of the lower part of the sample locking mechanism 2 is provided, and the T-shaped sample groove is used to connect with the upper part of the sample 4; the auxiliary fixture also includes a lower pull rod 5, with a T-shaped through hole penetrating its radial direction at the upper part of the lower pull rod 5, and the T-shaped through hole is used to connect with the lower part of the sample 4.

[0058] Two handles 3, which are 180° apart, are fixed on the circumferential surface of the side of the sample locking mechanism 2.

[0059] The upper center of the sample locking mechanism 2 is provided with a threaded hole along the axial direction, and the upper pull rod 1 is connected to the sample locking mechanism 2 through the threaded hole.

[0060] The overall longitudinal section of sample 4 is an inverted "I" shape with a longer top and shorter bottom.

[0061] Sample 4 includes a metal composite layer 41 and a base metal 43, and the contact area between the two is the bonding surface 42.

[0062] The upper transverse portion of sample 4 is a metal composite layer 41, and its transverse cross-section is circular or racetrack-shaped; the middle part of sample 4 is a slender cylindrical structure, and the lower part is a flat cylindrical structure. The head and the lower part constitute the base metal 43.

Claims

1. An auxiliary tooling for testing the bonding strength of layered metal composite materials, characterized in that, The fixture includes a cylindrical sample locking mechanism (2), with an upper pull rod (1) connected to the center of its upper part; a T-shaped sample groove penetrating its cylindrical side is provided at the center of the lower part of the sample locking mechanism (2), and the T-shaped sample groove is used to connect with the upper part of the sample (4); the auxiliary fixture also includes a lower pull rod (5), and a T-shaped through hole penetrating its radial direction is provided at the upper part of the lower pull rod (5), and the T-shaped through hole is used to connect with the lower part of the sample (4).

2. The auxiliary tooling for testing the bonding strength of metal layered composite materials according to claim 1, characterized in that, The sample locking mechanism (2) has two handles (3) fixed on its side circumferential surface at a 180° angle.

3. The auxiliary tooling for testing the bonding strength of metal layered composite materials according to claim 1, characterized in that, The upper center of the sample locking mechanism (2) is provided with a threaded hole along the axial direction, and the upper pull rod (1) is connected to the sample locking mechanism (2) through the threaded hole.

4. The auxiliary tooling for testing the bonding strength of metal layered composite materials according to claim 1, characterized in that, The overall longitudinal section of the sample (4) is an inverted "I" shaped structure with a longer top and shorter bottom.

5. The auxiliary tooling for testing the bonding strength of metal layered composite materials according to claim 4, characterized in that, The sample (4) includes a metal composite layer (41) and a base metal (43), and the part where the two come into contact is the bonding surface (42).

6. The auxiliary tooling for testing the bonding strength of metal layered composite materials according to claim 5, characterized in that, The upper transverse part of the sample (4) is a metal composite layer (41), and its transverse cross section is circular or racetrack-shaped; the middle part of the sample (4) is a slender cylindrical structure, and the lower part is a flat cylindrical structure, with the head and the lower part constituting the base metal (43).

7. The auxiliary tooling for testing the bonding strength of layered metal composite materials according to claim 6, characterized in that, The shape and size of the T-shaped sample groove are adapted to the upper part of the sample (4).

8. The auxiliary tooling for testing the bonding strength of metal layered composite materials according to claim 6, characterized in that, The shape and size of the T-shaped through hole are adapted to the lower half of the sample (4).

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