Titanium alloy sheet strain fatigue buckling-restrained device structure

Abstract

The utility model provides a titanium alloy sheet strain fatigue buckling prevention device structure which comprises a first supporting frame and a second supporting frame which are of an I-shaped structure and arranged oppositely, screw holes formed in the two ends of the first supporting frame and the two ends of the second supporting frame respectively, and fastening bolts matched with the screw holes in size and identical to the screw holes in number. The first supporting frame and the second supporting frame are the same in structure, and the fastening bolts are screwed into the screw holes to fixedly connect the first supporting frame and the second supporting frame. The buckling-restrained device for the strain control fatigue test of the titanium alloy thin plate has the advantages that the distance between the supporting frame and the sample groove is adjusted by arranging the gaskets with different thickness specifications, so that the test requirements of thin plate samples with different thickness specifications can be met, and the applicability of the buckling-restrained device is improved.

Description

Technical Field

[0001] This utility model belongs to the field of mechanical testing technology, and in particular relates to an anti-buckling device for strain control fatigue testing of titanium alloy thin plates. Background Technology

[0002] Titanium alloys are widely used in aerospace and other fields due to their low density, high specific strength, and strong corrosion resistance. With the increasing demands for integrity, reliability, and durability of aerospace structural components, the design philosophy has gradually shifted from simple static strength to safety-life, failure-safety, and ultimately, damage-tolerant design principles. Titanium alloy materials are also gradually developing towards damage-tolerant alloys with high fracture toughness and low crack propagation rates. Titanium alloys often operate under alternating loads in engineering, and their primary failure mode is fatigue fracture. Due to its sudden nature, significant plastic deformation does not occur before fracture, making it highly hazardous. To meet the requirements of safe-life design and damage-tolerant design, the fatigue performance of titanium alloys has become an important evaluation basis and reference indicator, making the reliability requirements for titanium alloy fatigue performance testing more urgent. Titanium alloy thin plates, as an important raw material, are widely used in various fields. Examining their fatigue performance indicators, especially low-cycle fatigue performance indicators, has significant research value and guiding significance. However, thin plates have relatively low stiffness in the thickness direction, making them prone to lateral buckling in the thickness direction under tensile and compressive cyclic loads, leading to test failure. Although the relevant test standards provide a schematic diagram of the anti-buckling device, they do not provide specific technical parameters.

[0003] Existing Chinese patents disclose several anti-buckling devices for sheet metal, which are fixed by fastening bolts. However, the torque of the fastening bolts has a significant impact on the test, and the selection and application of the lubricant also need to be demonstrated.

[0004] Therefore, it is necessary to provide a strain fatigue anti-buckling device structure for titanium alloy thin plates to solve the above-mentioned technical problems. Utility Model Content

[0005] The purpose of this invention is to provide an anti-buckling device for strain-controlled fatigue testing of titanium alloy thin plates, so as to solve the problem of buckling of existing titanium alloy thin plate specimens during strain fatigue testing.

[0006] To achieve the above objectives, the specific technical solution of the buckling prevention device for strain-controlled fatigue testing of titanium alloy thin plates according to this utility model is as follows:

[0007] A buckling-resistant device for strain-controlled fatigue testing of titanium alloy thin plates includes:

[0008] The first and second support frames are arranged in an I-shape and are opposite to each other. The first and second support frames are respectively provided with screw holes at both ends of the first and second support frames, and the same number of fastening bolts are provided with screw holes of the same size. The first and second support frames have the same structure and are fixedly connected by the fastening bolts being screwed into the screw holes.

[0009] Preferably, the number of screw holes and the number of fastening bolts are both four.

[0010] Preferably, the device also includes four washers installed on the outside of the fastening bolt, the washers having different thicknesses for clamping samples of different thicknesses.

[0011] Preferably, it also includes two oil injection holes, which are respectively located at the middle of the upper end of the first support frame and the second support frame, at a certain angle to the end face.

[0012] Preferably, it also includes two fixing columns, which are respectively disposed at the middle of the outer side of the first support frame and the second support frame, for fixing the extensometer.

[0013] Preferably, it also includes two sample slots, which are respectively located at the middle of the inner sides of the first support frame and the second support frame, and have a certain height difference from the positions of the fastening bolts on both sides, for clamping the sample.

[0014] Preferably, it also includes two lubrication grooves, which are respectively disposed inside the first support frame and the second support frame, and are located in the middle of the sample groove.

[0015] Preferably, it also includes a plurality of lubrication holes, which are arranged at a certain distance along the entire length of the lubrication groove.

[0016] Preferably, the thickness of the lubrication groove is less than the thickness of the fastening screws of the support frame, and it is used to clamp the sample. The oil injection hole, lubrication groove and lubrication hole of the first support frame and the second support frame are located in the same position.

[0017] Preferably, the oil injection hole is at a certain angle to the end face of the support frame, and lubricant is added through the oil injection hole. The lubrication holes in the middle of the lubrication groove are arranged at equal intervals, and there are 11 lubrication holes distributed throughout the entire length of the lubrication groove.

[0018] Compared with related technologies, the strain fatigue anti-buckling device structure for titanium alloy thin plates provided by this utility model has the following beneficial effects:

[0019] This invention provides a strain fatigue buckling-resistance device structure for titanium alloy thin plates. By using shims of different thicknesses, the distance between the support frame and the sample groove can be adjusted to meet the testing requirements of thin plate samples of different thicknesses, thus improving the applicability of the buckling-resistance device. During the test, lubricant can be added through the oil injection hole in the middle of the upper end of the support frame to ensure that the frictional force meets the requirements of the relevant test methods. A fixing post is set at the middle position of the outer side of the support frame for locking when the extensometer spring is clamped, achieving a stable connection between the extensometer and the buckling-resistance device. In addition, the lubrication holes in the lubrication groove are distributed at equal intervals, which can play a role in storing and flowing lubricant, preventing the lubricant from being squeezed out of the contact surface under alternating loads, thus avoiding excessive frictional force that would affect the test results and improving the stability of the test. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the anti-buckling device for strain control fatigue testing of titanium alloy thin plates according to this utility model.

[0021] Figure 2 This is a schematic diagram of the movable fixed structure in the anti-buckling device for strain control fatigue testing of titanium alloy thin plates according to this utility model;

[0022] Figure 3 This is a schematic diagram of the oil injection hole, lubrication groove, and lubrication hole structure in an anti-buckling device for strain control fatigue testing of titanium alloy thin plates according to this utility model.

[0023] Figure 4 This is a schematic diagram of the anti-buckling device, sample groove, and fixing column structure for strain-controlled fatigue testing of titanium alloy thin plates according to this utility model.

[0024] In the figure, 1 is the first support frame; 2 is the second support frame; 3 is the through hole; 4 is the fastening bolt; 5 is the gasket; 6 is the oil injection hole; 7 is the fixing column; 8 is the sample groove; 9 is the lubrication groove; and 10 is the lubrication hole. Detailed Implementation

[0025] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0026] Please see Figures 1 to 4 The present invention provides a buckling prevention device for strain control fatigue testing of titanium alloy thin plates, comprising: an I-shaped first support frame 1 and a second support frame 2 arranged opposite to each other, screw holes 3 respectively provided at both ends of the first support frame 1 and the second support frame 2, fastening bolts 4 matching the size and number of the screw holes, two oil injection holes 6, two fixing columns 7, two sample grooves 8, two lubrication grooves 9 and several lubrication holes 10.

[0027] The first support frame 1 and the second support frame 2 have the same structure and are fixedly connected by the fastening bolts 4 being screwed into the screw holes 3.

[0028] In this embodiment, there are four screw holes 3 and four fastening bolts 4; it also includes four washers 5 installed on the outside of the fastening bolts 4, the washers 5 having different thicknesses for clamping samples of different thicknesses.

[0029] The two oil injection holes 6 are respectively located at the middle of the upper end of the first support frame 1 and the second support frame 2, and are at a certain angle to the end face.

[0030] The two fixing columns 7 are respectively set at the middle of the outer side of the first support frame 1 and the second support frame 2, and are used to fix the extensometer.

[0031] The two sample slots 8 are respectively located in the middle of the inner side of the first support frame 1 and the second support frame 2, and have a certain height difference from the positions of the fastening bolts 4 on both sides, for clamping the sample.

[0032] The two lubrication grooves 9 are respectively disposed inside the first support frame 1 and the second support frame 2, and are located in the middle of the sample groove 5.

[0033] A number of the lubrication holes 10 are arranged at certain intervals along the entire length of the lubrication groove 9.

[0034] The thickness of the lubrication groove 9 is less than the thickness of the fastening screw 4 of the support frame, and it is used to clamp the sample. The oil injection hole 6, lubrication groove 9 and lubrication hole 10 of the first support frame 1 and the second support frame 2 are set in the same position.

[0035] The oil injection hole 6 is at a certain angle to the end face of the support frame. Lubricant is added through the oil injection hole 6. The lubrication holes 10 in the middle of the lubrication groove 9 are arranged at equal intervals. There are 11 lubrication holes 10, which are distributed throughout the entire length of the lubrication groove 9.

[0036] In use, the sample is clamped in the lubrication groove 9 on the inner side of the first support frame 1, and the working section of the sample is distributed as much as possible within the entire length of the lubrication groove 9. According to the thickness of the thin plate sample, four shims 5 of appropriate thickness are installed on the outside of the fastening bolt 4. The second support frame 2 is installed on the other side of the sample in a symmetrical manner with the first support frame 1, and the sample is placed in the lubrication groove 9 of the second support frame 2. At this time, the through holes 3 at both ends of the horizontal rod of the first support frame 1 and the second support frame 2 are in the same position. The first support frame 1 and the second support frame 2 are connected by passing the fastening bolt 4 through the through hole 3. Lubricant is injected from the oil injection hole 6. The sample is gently pulled to make the lubricant evenly distributed in the lubrication groove 9 and the lubrication hole 10.

[0037] This invention relates to a buckling-resistance device for strain-controlled fatigue testing of thin titanium alloy plates. By setting shims of different thicknesses, the distance between the support frame and the sample groove can be adjusted to meet the testing requirements of titanium alloy thin plate samples of different thicknesses, thus improving the applicability of the buckling-resistance device. Simultaneously, the lubrication holes in the lubrication groove are distributed at equal intervals, which can store and flow lubricant, preventing the lubricant from being squeezed out of the contact surface under alternating loads, thus avoiding excessive friction that could affect the test results and improving the stability of the test.

[0038] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A strain fatigue anti-buckling device structure for titanium alloy thin plates, characterized in that, include: The first support frame (1) and the second support frame (2) are arranged in an I-shape and are opposite to each other. The first support frame (1) and the second support frame (2) are respectively provided with screw holes (3) at both ends of the first support frame (1) and the second support frame (2) and the same number of fastening bolts (4) with matching screw hole size. The first support frame (1) and the second support frame (2) have the same structure and are fixedly connected by the fastening bolts (4) screwed into the screw holes (3).

2. The structure of the strain fatigue anti-buckling device for titanium alloy thin plates according to claim 1, characterized in that, The number of screw holes (3) and fastening bolts (4) is four.

3. The structure of the strain fatigue anti-buckling device for titanium alloy thin plates according to claim 2, characterized in that, It also includes four gaskets (5) installed on the outside of the fastening bolt (4), the gaskets (5) having different thicknesses for clamping samples of different thicknesses.

4. The structure of the strain fatigue anti-buckling device for titanium alloy thin plates according to claim 2, characterized in that, It also includes two oil injection holes (6), which are respectively located at the middle of the upper end of the first support frame (1) and the second support frame (2), and are at a certain angle to the end face.

5. The structure of the strain fatigue anti-buckling device for titanium alloy thin plates according to claim 4, characterized in that, It also includes two fixing columns (7), which are respectively set at the middle of the outer side of the first support frame (1) and the second support frame (2) for fixing the extensometer.

6. The structure of the strain fatigue anti-buckling device for titanium alloy thin plates according to claim 5, characterized in that, It also includes two sample slots (8), which are respectively located in the middle of the inner side of the first support frame (1) and the second support frame (2), and have a certain height difference with the fastening bolts (4) on both sides, for clamping the sample.

7. The structure of the strain fatigue anti-buckling device for titanium alloy thin plates according to claim 6, characterized in that, It also includes two lubrication grooves (9), which are respectively located inside the first support frame (1) and the second support frame (2), in the middle position of the sample groove (8).

8. The structure of the strain fatigue anti-buckling device for titanium alloy thin plates according to claim 7, characterized in that, It also includes a number of lubrication holes (10), which are arranged at a certain distance along the entire length of the lubrication groove (9).

9. The structure of a strain fatigue anti-buckling device for titanium alloy thin plates according to claim 8, characterized in that, The thickness of the lubrication groove (9) is less than the thickness of the fastening bolt (4) of the support frame, and it is used to clamp the sample. The oil injection hole (6), lubrication groove (9) and lubrication hole (10) of the first support frame (1) and the second support frame (2) are set in the same position.

10. The structure of a strain fatigue anti-buckling device for titanium alloy thin plates according to claim 9, characterized in that, The oil injection hole (6) is at a certain angle to the end face of the support frame. Lubricant is added through the oil injection hole (6). The lubrication holes (10) in the middle of the lubrication groove (9) are arranged at equal intervals. There are 11 lubrication holes (10) and they are distributed throughout the entire length of the lubrication groove (9).

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