Anti-buckling tool for low-cycle fatigue test sheet metal structure

Abstract

The utility model relates to the technical field of low-cycle fatigue tests, and discloses an anti-buckling tool for a low-cycle fatigue test sheet metal structure, which comprises a fixing assembly and a guide assembly, the fixing assembly comprises an upper fixing piece I, an upper fixing piece II, a lower fixing piece I and a lower fixing piece II, two screws are connected between the first upper fixing piece and the second upper fixing piece, two screws are connected between the first lower fixing piece and the second lower fixing piece, and cushion blocks are arranged on the inner side faces of the first upper fixing piece, the second upper fixing piece, the first lower fixing piece and the second lower fixing piece. Through the fixing assembly, the sample can be conveniently and quickly assembled, the low-cycle fatigue test requirement of the sheet metal structure can be met, and the lateral buckling instability phenomenon between a clamping part of equipment and the buckling-restrained tool can be reduced; through the guide assembly, when the sample bears a tension and compression cyclic load, the lateral buckling instability phenomenon in the thickness direction is prevented, and the stability of the sample is further enhanced.

Description

Technical Field

[0001] This utility model relates to the field of low-cycle fatigue testing technology, specifically to a buckling-resistant fixture for low-cycle fatigue testing of thin plate metallic structures. Background Technology

[0002] In recent years, sheet metal has become one of the most widely used materials in modern industry. Due to its lightweight, high strength, and corrosion resistance, it has been widely applied in aerospace, automotive, and electronics fields. Under actual working conditions, sheet metal is subjected to continuous cyclic loads, so it is of great significance to study the fatigue performance of sheet metal, especially its low-cycle fatigue performance.

[0003] However, due to their small thickness dimension, large slenderness ratio, and low stiffness, thin sheet metal is prone to lateral buckling instability in the thickness direction when subjected to tensile and compressive cyclic loads. In strain-controlled low-cycle fatigue tests of thin sheet metal, studying anti-buckling devices for thin sheet metal is of great significance for improving the stability and working efficiency of mechanical structures. Utility Model Content

[0004] The purpose of this invention is to provide a buckling-resistant fixture for thin-plate metallic structures used in low-cycle fatigue testing, in order to solve the technical problems in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A buckling-resistant fixture for thin-plate metallic structures used in low-cycle fatigue testing includes a fixing assembly and a guiding assembly. The fixing assembly includes an upper fixing component 1, an upper fixing component 2, a lower fixing component 1, and a lower fixing component 2. Two screws are connected between the upper fixing component 1 and the upper fixing component 2, and between the lower fixing component 1 and the lower fixing component 2. A pad is provided on the inner surface of the upper fixing component 1, the upper fixing component 2, the lower fixing component 1, and the lower fixing component 2. A limit groove is provided at the joint of the upper fixing component 1 and the lower fixing component 1, and between the upper fixing component 2 and the lower fixing component 2.

[0007] Preferably, the upper fixing member one, upper fixing member two, lower fixing member one and lower fixing member two are used to install the sample, and the upper and lower ends of the sample are symmetrically arranged.

[0008] Preferably, the upper fixing member one and the upper fixing member two are mutually matched, and the lower fixing member one and the lower fixing member two are mutually matched.

[0009] Preferably, the joints between the upper fixing member 1 and the upper fixing member 2 and the lower fixing member 1 and the lower fixing member 2 are all engaged by limiting grooves.

[0010] Preferably, the guide assembly includes four guide rods and four guide tubes, which are respectively fixedly installed on both sides of the joint of the upper fixing member 1, the upper fixing member 2, the lower fixing member 1, and the lower fixing member 2, and the guide tubes are provided with rod grooves inside.

[0011] Preferably, the guide rod and the conduit are opposite to each other, with the guide rod in the upper fixing member and the conduit in the lower fixing member corresponding to each other.

[0012] Preferably, the guide rod is slidably positioned within the rod groove.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] 1) This buckling-resistance fixture, by setting a fixing component, the fixing parts between the upper and lower ends are connected by screws to press and fix the sample. The support and limiting of the pad block facilitates the rapid assembly of the sample. It can meet the requirements of low cycle fatigue test of thin plate metal structure. The sample is completely fixed inside the buckling-resistance fixture, which can reduce the lateral buckling instability between the clamping part of the equipment and the buckling-resistance fixture compared with the previous method.

[0015] 2) This buckling protection fixture, by setting a guide component, connects the guide rod with the guide tube, allowing the guide rod to slide within the rod groove, which facilitates the adjustment of the distance between the upper and lower fixing parts, thus preventing lateral buckling instability in the thickness direction when the specimen is subjected to tensile and compressive cyclic loads, and further enhancing the stability of the specimen. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of an anti-buckling fixture for a thin plate metallic structure used in low-cycle fatigue testing, according to an embodiment of this utility model.

[0017] Figure 2 This is a schematic diagram of the disassembled structure of the fixing component in an embodiment of the present utility model;

[0018] Figure 3 This is a schematic diagram of the structure of the upper fixing member one and the upper fixing member two in the embodiment of this utility model;

[0019] Figure 4 This is a schematic diagram of the structure of the lower fixing member one and the lower fixing member two in an embodiment of this utility model;

[0020] Figure 5 This is a schematic diagram of the structure of the guide component in an embodiment of this utility model.

[0021] In the figure: 1. Sample; 2. Fixing assembly; 3. Guide assembly; 4. Upper fixing part one; 5. Upper fixing part two; 6. Lower fixing part one; 7. Lower fixing part two; 8. Screw; 9. Pad; 10. Limiting groove; 11. Guide rod; 12. Guide tube; 13. Rod groove. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] Example 1

[0024] Combination Figures 1-5 A buckling-resistant fixture for thin sheet metal structures used in low-cycle fatigue testing includes a fixing component 2 and a guiding component 3.

[0025] See Figures 2-4 Furthermore, the fixing component 2 includes an upper fixing part 4, an upper fixing part 5, a lower fixing part 6, and a lower fixing part 7. Two screws 8 are connected between the upper fixing part 4 and the upper fixing part 5, and between the lower fixing part 6 and the lower fixing part 7. A pad 9 is provided on the inner surface of the upper fixing part 4, the upper fixing part 5, the lower fixing part 6, and the lower fixing part 7. A limiting groove 10 is provided at the joint between the upper fixing part 4 and the lower fixing part 6, and between the upper fixing part 5 and the lower fixing part 7.

[0026] The upper fixing part 4, the upper fixing part 5, the lower fixing part 6 and the lower fixing part 7 are used to install the sample 1. The upper and lower ends of the sample 1 are symmetrically arranged. The upper end of the sample 1 is pressed by the upper fixing part 4 and the upper fixing part 5, and the lower end of the sample 1 is pressed by the lower fixing part 6 and the lower fixing part 7.

[0027] The upper fixing part 4 and the upper fixing part 5 are matched with each other, the lower fixing part 6 and the lower fixing part 7 are matched with each other, and the pad 9 is used for the support and limit of the sample to prevent the upper and lower ends of the sample 1 from shifting to the sides.

[0028] The joints between the upper fixing part 1 4, the upper fixing part 2 5 and the lower fixing part 1 6, the lower fixing part 2 7 are all engaged by the limiting groove 10, and the upper and lower fixing parts are connected by the limiting groove 10.

[0029] Specifically, the upper and lower ends of the sample 1 are pressed together by the upper fixing part 4 and the upper fixing part 5, the lower fixing part 6 and the lower fixing part 7, and then connected and fixed by the screw 8, so that the fixing parts between the upper and lower ends are aligned, and the sample 1 is completely wrapped.

[0030] Example 2

[0031] See Figure 5Furthermore, based on Embodiment 1, the guide assembly 3 includes four guide rods 11 and four guide tubes 12. The four guide rods 11 and four guide tubes 12 are respectively fixedly installed on both sides of the docking points of the upper fixing member 1 4, the upper fixing member 2 5, the lower fixing member 1 6 and the lower fixing member 2 7. The guide tube 12 has a rod groove 13 inside.

[0032] The guide rod 11 and the conduit 12 are opposite to each other. The guide rod 11 in the upper fixing member 4 corresponds to the conduit 12 in the lower fixing member 6. The guide rod 11 and the conduit 12 are used to guide the sliding of the upper and lower fixing members.

[0033] The guide rod 11 is slidably positioned within the rod groove 13, and its fixed length is adjusted by the extension and retraction of the guide rod 11.

[0034] Specifically, when the upper fixing part 4 and the lower fixing part 6 are engaged, and the upper fixing part 5 and the lower fixing part 7 are engaged, the guide rod 11 is inserted into the corresponding guide tube 12 and slides in the rod groove 13, which can adjust the distance between the upper and lower fixing parts and ensure that the sample 1 can be stretched better.

[0035] In actual operation, the upper fixing part 1 4, upper fixing part 2 5, lower fixing part 1 6, and lower fixing part 2 7 that fix the sample 1 are all connected by two screws 8. Lubricant needs to be applied between the sample 1 and the upper and lower fixing parts to reduce the impact of friction on the experiment. The structure of the sample 1 and the buckling protection fixture are centrally symmetrical.

[0036] When assembling and fixing, apply lubricant to the contact parts of the upper and lower fixing parts with the sample 1, place the upper fixing part 4 flat on the plane, then place the upper part of the sample 1 on the surface of the upper fixing part 4, and then press the upper fixing part 5 on the surface. The straight section area in the middle of the sample 1 needs to extend beyond the two sides of the anti-buckling fixture to ensure the extensometer device is clamped during the experiment. Then connect the screws 8 on both sides to fix and press the upper fixing part 4 and the upper fixing part 5 with the sample 1. Similarly, press the lower fixing part 6 and the lower fixing part 7 to the lower part of the sample 1 and fix it with the screws 8. This anti-buckling fixture can completely wrap the sample 1.

[0037] During the guiding connection, the lower fixing part 6 slides upward from the lower end of the sample 1 during the assembly process and docks with it through the limiting groove 10. At the same time, the guide rod 11 in the lower fixing part 6 enters the guide tube 12 in the upper fixing part 4, and the guide rod 11 in the upper fixing part 4 enters the guide tube 12 in the lower fixing part 6. The same applies to the guide rod 11 and guide tube 12 in the upper fixing part 5 and the lower fixing part 7. By sliding and extending the guide rod 11 in the rod groove 13, the distance between the upper and lower fixing parts is adjusted, so that the sample 1 can be guided, stretched and slid to prevent lateral buckling instability.

[0038] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A buckling-restrained tooling for low-cycle fatigue testing of thin-plate metallic structures, characterized by: Including fixed assembly (2) and guide assembly (3); The fixed assembly (2) includes upper fixed part one (4), upper fixed part two (5), lower fixed part one (6) and lower fixed part two (7), two screws (8) are connected between the upper fixed part one (4) and the upper fixed part two (5), the lower fixed part one (6) and the lower fixed part two (7), the inner side of the upper fixed part one (4), the upper fixed part two (5), the lower fixed part one (6) and the lower fixed part two (7) is provided with a pad (9), and the abutting portion of the upper fixed part one (4) and the lower fixed part one (6), the upper fixed part two (5) and the lower fixed part two (7) is provided with a limiting groove (10).

2. The buckling-restrained fixture for low-cycle fatigue testing of thin-walled metallic structures according to claim 1, characterized in that: The upper fixed part one (4), the upper fixed part two (5), the lower fixed part one (6) and the lower fixed part two (7) are used for installing the sample (1), and the upper and lower ends of the sample (1) are symmetrically arranged.

3. The buckling-restrained fixture for low-cycle fatigue testing of thin-walled metallic structures according to claim 1, characterized in that: The upper fixed part one (4) and the upper fixed part two (5) are matched with each other, and the lower fixed part one (6) and the lower fixed part two (7) are matched with each other.

4. The buckling-restrained fixture for low-cycle fatigue testing of thin-walled metallic structures of claim 1, wherein: The abutting portion between the upper fixed part one (4), the upper fixed part two (5) and the lower fixed part one (6), the lower fixed part two (7) is clamped through the limiting groove (10).

5. The buckling-restrained fixture for low-cycle fatigue testing of thin-walled metallic structures according to claim 1, characterized in that: The guide assembly (3) includes four guide rods (11) and four guide pipes (12), four guide rods (11) and four guide pipes (12) are respectively fixedly installed at the abutting portion of the upper fixed part one (4), the upper fixed part two (5), the lower fixed part one (6) and the lower fixed part two (7) on both sides, and the inner side of the guide pipe (12) is provided with a rod groove (13).

6. The buckling-restrained fixture for low-cycle fatigue testing of thin-walled metallic structures according to claim 5, characterized in that: The guide rod (11) and the guide pipe (12) are opposite to each other, the guide rod (11) in the upper fixed part one (4) corresponds to the guide pipe (12) in the lower fixed part one (6).

7. The buckling-restrained fixture for low-cycle fatigue testing of thin-plate metallic structures according to claim 5, characterized in that: The guide rod (11) is slidably arranged in the rod groove (13).

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