A fixture for sheet metal fatigue testing and method of use

Abstract

The embodiment of the application discloses a kind of metal sheet fatigue test fixing device and its using method, it is related to metal material mechanical property detection technical field, including: metal sheet sample, including 2 clamping parts and test part, 2 clamping parts are set in the both ends of the test part;Lubricating film is set in the front and back of the metal sheet sample;Anti-buckling component, metal sheet sample with the lubricating film is fixed in the anti-buckling component, clamping component, the clamping component passes through the anti-buckling component and clamps the clamping part, testing machine is connected with the clamping component by clamping block;By setting anti-buckling component, the buckling of test site is inhibited, and the sample buckling between clamping part and anti-buckling component is also inhibited by clamping component, so as to meet the anti-buckling requirement of the test that metal sheet below 1.5mm thickness specification exists deformation when sample is pressed in fatigue test, and extensometer needs to be installed on sample thickness side.

Description

Technical Field

[0001] This application relates to the field of mechanical property testing technology for metallic materials, and in particular to a fixing device for fatigue testing of thin metal plates and its usage method. Background Technology

[0002] For fatigue specimens of thin metal sheets with a thickness of 2.5 mm or less, clamps are required to suppress lateral bending deformation during compressive deformation. Besides fatigue testing, other thin metal sheet specimens exhibit a tendency for lateral buckling during compressive deformation. Lateral buckling typically refers to the test area of ​​the specimen; however, for specimens with a thickness of 1.5 mm or less, lateral buckling also occurs in the area between the clamp and the buckling-resisting fixture. This is because the gap between the clamp and the buckling-resisting fixture leaves this part of the specimen unprotected. Currently, there is no method to simultaneously address lateral buckling in both areas for tests requiring extensometer strain monitoring on the thickness side of the specimen and involving compressive deformation. Summary of the Invention

[0003] The purpose of this application is to provide a fixing device and its usage method for fatigue testing of thin metal sheets, so as to solve to some extent the technical problem that thin metal sheets with a thickness of less than 1.5 mm are prone to buckling during fatigue testing.

[0004] To solve the above-mentioned technical problems, this application adopts the following technical solution:

[0005] A first aspect of this application provides a fixing device for fatigue testing of a thin metal sheet, comprising: a thin metal sheet specimen, including two clamping portions and a testing portion, the two clamping portions being disposed at both ends of the testing portion; a lubricating film disposed on both sides of the thin metal sheet specimen; a buckling-resistance assembly, the thin metal sheet specimen with the lubricating film being fixed within the buckling-resistance assembly; a clamping assembly, the clamping assembly passing through the buckling-resistance assembly to clamp the clamping portions; and a testing machine being connected to the clamping assembly via clamping blocks.

[0006] In some embodiments, the anti-buckling component includes: an upper fixing plate having a first mounting groove and first interfaces on both sides of the first mounting groove; a lower fixing plate having a second mounting groove and second interfaces on both sides of the second mounting groove, the upper fixing plate being fixed to the lower fixing plate; and a fixing unit, the upper fixing plate being connected to the lower fixing plate via the fixing unit, the first mounting groove and the second mounting groove being joined to form a clamping space, and the metal sheet sample being placed within the clamping space.

[0007] In some embodiments, the fixing unit includes a pin, and the upper fixing plate and the lower fixing plate are provided with fixing holes, through which the pin passes to fix the upper fixing plate and the lower fixing plate.

[0008] In some embodiments, the clamping assembly includes two clamping plates, which respectively clamp two clamping portions of the metal sheet sample.

[0009] In some embodiments, the clamping plate includes a first connecting portion and a second connecting portion, the first connecting portion passing through a first interface or a second interface to connect to the metal sheet sample, and the second connecting portion being used to connect the testing machine via a clamping block.

[0010] In some embodiments, the second connecting portion includes a connecting groove disposed on the outside of the clamping plate, and the outer surface of the connecting groove is provided with a toothed surface.

[0011] In some embodiments, the transverse cross-section of the lubricating film is the same as the cross-section of the first mounting groove or the second mounting groove;

[0012] In some embodiments, the lubricating film is made of polytetrafluoroethylene.

[0013] In some embodiments, the upper fixing plate and the lower fixing plate are made of titanium alloy or high-strength steel.

[0014] A second aspect of this application provides a method for using a fixing device for fatigue testing of thin metal sheets, characterized by comprising the following steps:

[0015] 1) Apply the lubricating film to both sides of the metal sheet sample, and then fix the metal sample in the anti-buckling component;

[0016] 2) Use the clamping assembly to clamp the clamping part through the anti-buckling assembly;

[0017] 3) Connect the clamping blocks and clamping components of the testing machine, install the extensometer, set the test parameters, and start the test.

[0018] As can be seen from the above technical solution, this application has at least the following advantages and positive effects:

[0019] The fixing device for fatigue testing of thin metal plates disclosed in this application suppresses buckling at the test site by setting up an anti-buckling component, and also suppresses sample buckling between the clamping part and the anti-buckling component by using a clamping component. This satisfies the anti-buckling requirement for tests where thin metal plates with a thickness of 1.5 mm or less exhibit compressive deformation during fatigue testing and where an extensometer needs to be installed on the thickness side of the sample.

[0020] The present application discloses a method for using a fixing device for fatigue testing of thin metal plates. By setting up an anti-buckling component, buckling of the test area is suppressed. Furthermore, the clamping component suppresses the buckling of the specimen between the clamping part and the anti-buckling component. This satisfies the anti-buckling requirement for tests where thin metal plates with a thickness of 1.5 mm or less exhibit compressive deformation during fatigue testing and where an extensometer needs to be installed on the thickness side of the specimen. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the structure of a fixing device for fatigue testing of a thin metal sheet according to an embodiment;

[0023] Figure 2 This is a partial structural schematic diagram of a fixing device for fatigue testing of a thin metal sheet according to an embodiment;

[0024] Figure 3 This is a second partial structural schematic diagram of a fixing device for fatigue testing of a thin metal sheet according to an embodiment;

[0025] Figure 4 This is a schematic diagram of the clamping plate of a fixing device for fatigue testing of a thin metal sheet according to an embodiment;

[0026] Figure 5 This is a schematic diagram of the structure of a metal sheet specimen for a fixing device in a metal sheet fatigue test according to an embodiment.

[0027] Figure 6 This is a schematic diagram of the structure of the lubricating film of a fixing device for fatigue testing of a thin metal sheet according to an embodiment.

[0028] The reference numerals in the attached drawings are explained as follows: 100, metal sheet sample; 101, clamping part; 102, testing part; 200, anti-buckling component; 210, upper fixing plate; 211, first mounting groove; 212, first interface; 213, fixing hole; 220, lower fixing plate; 230, pin; 300, clamping component; 310, clamping plate; 311, first connecting part; 312, second connecting part; 313, connecting groove; 400, clamping block; 500, extensometer; 600, lubricating film. Detailed Implementation

[0029] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0030] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0031] The terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first," "second," or "third" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0032] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "connection," "installation," "connection," and "linkage" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0033] Please see Figures 1-3 .

[0034] Figures 1-3This is a schematic diagram of a fixing device for fatigue testing of a thin metal sheet according to an embodiment of this application. As shown in the figure, the device includes: a thin metal sheet sample 100, including two clamping parts 101 and a testing part 102, with the two clamping parts 101 disposed at both ends of the testing part 102; a lubricating film 600 disposed on both sides of the thin metal sheet sample 100; a buckling-resistant assembly 200, in which the thin metal sheet sample 100 with the lubricating film 600 is fixed; and a clamping assembly 300. The clamping part 101 is clamped by the buckling-resistance component 200, and the testing machine is connected to the clamping component 300 through the clamping block 400. By setting the buckling-resistance component 200, the buckling of the test part 102 is suppressed, and the buckling of the specimen between the clamping part 101 and the buckling-resistance component 200 is also suppressed by the clamping component 300. This satisfies the buckling-resistance requirement for the test of metal sheet with a thickness of less than 1.5 mm, where the specimen has compressive deformation during fatigue testing and an extensometer 500 needs to be installed on the thickness side of the specimen.

[0035] Please see Figure 4 :

[0036] In this embodiment, the metal sheet sample 100 includes two clamping parts 101 and a testing part 102. The two clamping parts 101 are disposed at both ends of the testing part 102. The clamping parts 101 gradually extend towards one end of the testing part 102. The thickness of the metal sheet is 0.5 to 1.5 mm.

[0037] Please see Figure 2 ;

[0038] In some embodiments, the anti-buckling component 200 includes: an upper fixing plate 210, on which a first mounting groove 211 is provided, and first interfaces 212 are provided on both sides of the first mounting groove 211; a lower fixing plate 220, on which a second mounting groove is provided, and second interfaces are provided on both sides of the second mounting groove, and the upper fixing plate 210 is fixed to the lower fixing plate 220; and a fixing unit, in which the upper fixing plate 210 is connected to the lower fixing plate 220, and the first mounting groove 211 and the second mounting groove are spliced ​​together to form a clamping space, and the metal sheet sample 100 is placed in the clamping space.

[0039] In this embodiment, the fixing unit includes a pin 230, and the upper fixing plate 210 and the lower fixing plate 220 are provided with fixing holes 213. The pin 230 passes through the fixing holes 213 to fix the upper fixing plate 210 and the lower fixing plate 220.

[0040] Please see Figure 5 ;

[0041] In this embodiment, the clamping assembly 300 includes two clamping plates 310, which respectively clamp two clamping parts 101 of the metal sheet sample 100.

[0042] In this embodiment, the clamping plate 310 includes a first connecting part 311 and a second connecting part 312. The first connecting part 311 passes through the first interface 212 or the second interface and is connected to the metal sheet sample 100. The second connecting part 312 is used to connect to the testing machine through the clamping block 400.

[0043] In this embodiment, the second connecting portion 312 includes a connecting groove 313 disposed on the outer side of the clamping plate 310, and the outer surface of the connecting groove 313 is provided with a toothed surface. By providing the connecting groove 313 and the toothed surface, the buckling of the specimen between the clamping block 400 and the buckling-resistant component 200 can be suppressed.

[0044] Please see Figure 6 ;

[0045] In this embodiment, the transverse cross-section of the lubricating film 600 is the same as the cross-section of the first mounting groove 211 or the second mounting groove; the lubricating film 600 is made of polytetrafluoroethylene.

[0046] In this embodiment, the upper fixing plate 210 and the lower fixing plate 220 are made of titanium alloy or high-strength steel.

[0047] A second aspect of this application provides a method for using a fixing device for fatigue testing of thin metal sheets, characterized by comprising the following steps:

[0048] 1) Place the lubricating film 600 on both sides of the metal sheet sample 100, and then fix the metal sheet sample 100 in the anti-buckling component 200.

[0049] 2) Use the clamping assembly 300 to clamp the clamping part 101 through the anti-bending assembly 200;

[0050] 3) Connect the clamping block 400 of the testing machine to the clamping assembly 300, install the extensometer 500, set the test parameters, and start the test.

[0051] As can be seen from the above technical solution, this application has at least the following advantages and positive effects:

[0052] The fixing device for fatigue testing of thin metal plates disclosed in this application suppresses buckling at the test site by setting up an anti-buckling component, and also suppresses sample buckling between the clamping part and the anti-buckling component by using a clamping component. This satisfies the anti-buckling requirement for tests where thin metal plates with a thickness of 1.5 mm or less exhibit compressive deformation during fatigue testing and where an extensometer needs to be installed on the thickness side of the sample.

[0053] This application discloses a method for using a fixing device for fatigue testing of thin metal plates. By incorporating an anti-buckling component, buckling at the test site is suppressed. Furthermore, a clamping component further suppresses buckling of the specimen between the clamping part and the anti-buckling component. This satisfies the anti-buckling requirement for tests involving thin metal plates with a thickness of 1.5 mm or less, where compressive deformation occurs during fatigue testing and an extensometer needs to be installed on the thickness side of the specimen.

[0054] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A fixing device for fatigue testing of thin metal plates, characterized in that, include: A thin metal sheet sample includes two clamping parts and a testing part, with the two clamping parts disposed at both ends of the testing part; A lubricating film is disposed on both sides of the metal sheet sample; A buckling-resistance assembly, wherein a thin metal sheet sample with the lubricating film is fixed within the buckling-resistance assembly. A clamping assembly passes through the anti-buckling assembly to clamp the clamping part, and the testing machine is connected to the clamping assembly via a clamping block; The buckling protection component includes: An upper fixing plate is provided with a first mounting groove, and first interfaces are provided on both sides of the first mounting groove; The lower fixing plate is provided with a second mounting groove, and the two sides of the second mounting groove are provided with second interfaces. The upper fixing plate is fixed to the lower fixing plate. The upper fixing plate is connected to the lower fixing plate through the fixing unit, and the first mounting groove and the second mounting groove are spliced ​​together to form a clamping space, and the metal sheet sample is placed in the clamping space. The clamping assembly includes two clamping plates, which respectively clamp two clamping parts of the metal sheet sample; The clamping plate includes a first connecting part and a second connecting part. The first connecting part passes through a first interface or a second interface and is connected to the metal sheet sample. The second connecting part is connected to the testing machine through a clamping block.

2. The fixing device for fatigue testing of thin metal plates according to claim 1, characterized in that, The fixing unit includes a pin, and the upper fixing plate and the lower fixing plate are provided with fixing holes. The pin passes through the fixing holes to fix the upper fixing plate and the lower fixing plate.

3. The fixing device for fatigue testing of thin metal plates according to claim 1, characterized in that, The second connecting part includes a connecting groove disposed on the outside of the clamping plate, and the outer surface of the connecting groove is provided with a toothed surface.

4. The fixing device for fatigue testing of thin metal plates according to claim 1, characterized in that, The transverse cross-section of the lubricating film is the same as the cross-section of the first mounting groove or the second mounting groove.

5. The fixing device for fatigue testing of thin metal plates according to claim 1, characterized in that, The lubricating film is made of polytetrafluoroethylene.

6. The fixing device for fatigue testing of thin metal plates according to claim 1, characterized in that, The upper and lower fixing plates are made of titanium alloy or high-strength steel.

7. A method of using the fixing device for fatigue testing of thin metal plates according to any one of claims 1 to 6, characterized in that, Includes the following steps: 1) Apply the lubricating film to both sides of the metal sheet sample, and then fix the metal sample in the anti-buckling component; 2) Use the clamping assembly to clamp the clamping part through the anti-buckling assembly; 3) Connect the clamping blocks and clamping components of the testing machine, install the extensometer, set the test parameters, and start the test.

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