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A device for predicting fatigue crack growth rate

A technology of expanding rate and predicting device, applied in measuring device, using stable tension/pressure test material strength, instrument, etc., can solve the problem of inability to strengthen the surface of all materials, inconvenient to clamp and fix the workpiece to be tested, and to test the workpiece. Clamping instability and other problems, to avoid deflection, avoid detachment, and increase stability

Active Publication Date: 2022-04-08
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in large and complex structural parts, due to the large size of the workpiece, it is impossible to carry out surface strengthening treatment on all materials, so it is necessary to conduct in-depth research on the fatigue crack growth rate
[0003] The prediction of the growth rate of fatigue fracture cracks requires the use of detection devices to measure data such as tension and pressure of the workpiece, but the detection devices in the prior art are not convenient for clamping and fixing the workpiece to be detected, and the clamping of the workpiece to be detected is unstable. Therefore, it is easy to cause the workpiece to detach during the test process, which not only affects the measurement of the staff, but also poses a safety hazard

Method used

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  • A device for predicting fatigue crack growth rate
  • A device for predicting fatigue crack growth rate
  • A device for predicting fatigue crack growth rate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Such as Figure 1-8 As shown, a fatigue fracture crack growth rate prediction device according to an embodiment of the present invention includes a test seat 1 and mounting plates 2 symmetrically connected on both sides of the top of the test seat 1, and the top of the test seat 1 is located on both sides. A testing mechanism 3 is arranged between the two mounting plates 2, and clamping mechanisms 4 are arranged on both sides of the top of the testing mechanism 3;

[0050] Wherein, the test mechanism 3 includes a support shell 301, a test stand 302 and a test assembly 303, the test stand 302 is fixedly connected to the top of the support shell 301, and the test assembly 303 is arranged on the support shell 301;

[0051] Wherein, the testing component 303 is composed of a moving component 3031 and a driving component 3032;

[0052] Wherein, the moving assembly 3031 includes an adjusting bolt 30311, and both ends of the adjusting bolt 30311 are rotatably connected with i...

Embodiment 2

[0063] Such as Figure 1-8 As shown, the difference between this embodiment and Embodiment 1 is that the test assembly 303 further includes a positioning assembly 3033, and the positioning assembly 3033 includes a limit bearing sleeve 30331 rotatably mounted on the surface of the adjustment bolt 30311, and Both the top and the bottom of the limiting bearing sleeve 30331 are fixedly connected to the inner wall of the supporting shell 301 through the fixing rod 30332 .

[0064] By adopting the above technical solution, the adjustment bolt 30311 can be limited, and the rotation stability of the adjustment bolt 30311 can be increased.

Embodiment 3

[0066] Such as Figure 1-8 As shown, the difference between this embodiment and Embodiment 2 is that the test assembly 303 further includes a guide assembly 3034, and the guide assembly 3034 includes a guide rod 30341, and one end of the guide rod 30341 is connected to the support shell 301 The side of the guide rod 30341 is fixedly connected to the side of the mounting plate 2, the surface of the guide rod 30341 is slidably connected with a guide sleeve 30342, and the top of the guide sleeve 30342 is connected to the thread The bottom of the sleeve 30313 is fixedly connected, and the top and bottom of the inner wall of the guide sleeve 30342 are provided with limiting balls 30343, and the limiting balls 30343 are rollingly connected with the guide rod 30341.

[0067] By adopting the above-mentioned technical solution, the threaded sleeve 30313 is limited, and the stability of the movement of the threaded sleeve 30313 is increased, thereby improving the stability when the work...

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Abstract

The invention discloses a device for predicting the growth rate of fatigue fracture cracks, which comprises a test seat and mounting plates symmetrically connected on both sides of the top of the test seat, and the top of the test seat is arranged between the two mounting plates. The test mechanism is provided with a clamping mechanism on both sides of the top of the test mechanism; wherein the test mechanism includes a support shell, a test bench and a test assembly, the test bench is fixedly connected to the top of the support shell, and the A test assembly is disposed on the support shell. The present invention facilitates the clamping and fixing of the workpiece to be detected, thereby providing convenience for the staff, and ensuring the stability of the clamping of the workpiece to be detected, which can effectively avoid the clamping and loosening of the workpiece to be detected during the test process. Therefore, the stable operation of the detection work is guaranteed, and the danger caused by the separation of the workpiece is avoided, thereby improving the safety of use.

Description

technical field [0001] The invention relates to the technical field of fatigue fracture prediction, in particular to a fatigue fracture crack growth rate prediction device. Background technique [0002] Fatigue fracture refers to the fracture caused by the first generation of cracks in the local stress concentration or low-strength parts, and the subsequent expansion of cracks. Fatigue limit: under certain conditions (1) pure bending; (2) complete symmetrical cycle; (3) stress amplitude Constant; (4) The frequency is 3000-10000 times / min; the small sample has a sufficiently large transition fillet, and the surface is polished; obtained from the experiment, the maximum Stress; ways to increase the fatigue limit mainly include: try to avoid sharp corners, notches and cross-sectional mutations in the structural design of parts, so as to avoid stress concentration and thus fatigue cracks; improve the surface processing quality of parts and reduce fatigue sources; use various sur...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/08G01N3/04G01N3/02
CPCG01N3/08G01N3/04G01N3/02G01N2203/0017G01N2203/0019G01N2203/005G01N2203/0066G01N2203/0073G01N2203/04
Inventor 韩永典苏沫林赵雷徐连勇郝康达
Owner TIANJIN UNIV