Contrast test method for improving fretting fatigue resistance performance of material by laser shot blasting strengthening and test sample clamping device

A technology of laser shot peening and fretting fatigue, which is used in the application of repetitive force/pulsation force to test the strength of materials and the preparation of samples for testing.

Active Publication Date: 2016-01-20
JIANGSU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to solve the problem that the existing laser shot peening strengthening material anti-fretting fatigue performance test has a single force direction and cannot fully reflect the actual stress state of the parts, resulting in poor test accuracy. A comparative test method for improving the anti-fretting fatigue performance of materials, and at the same time provide a sample clamping device used to meet the test method

Method used

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  • Contrast test method for improving fretting fatigue resistance performance of material by laser shot blasting strengthening and test sample clamping device
  • Contrast test method for improving fretting fatigue resistance performance of material by laser shot blasting strengthening and test sample clamping device
  • Contrast test method for improving fretting fatigue resistance performance of material by laser shot blasting strengthening and test sample clamping device

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Embodiment 1

[0040] Such as Figure 1-5 shown.

[0041] A comparative test method for improving the anti-fretting fatigue performance of materials by laser shot peening, the specific steps of which are as follows:

[0042] 1) Perform laser shot peening strengthening treatment on the entire circumference side area of ​​the round bar sample 1 to be tested to form a strengthening shot peening area 13. As a test comparison, an area without surface treatment is reserved at its axially adjacent position as a test comparison Area 14, such as image 3 shown;

[0043] 2) if figure 2 As shown, the micro-movement pads 2 are respectively arranged in the two test areas, and the radius of the inner arc is equal to the radius of the round bar sample 1. Four semi-circular surface micro-motion pads fit and surround the two test areas. The axial distance between the fretting pads is 5~10mm;

[0044] 3) The pressing metal sheet 3 is closely attached to the semi-circular surface micro-movement pad 2, an...

Embodiment 2

[0052] Such as Figure 1-3 shown.

[0053] A sample clamping device for laser shot peening to improve the comparative test of material fretting fatigue resistance performance, such as figure 2 As shown, it includes: it includes semi-circular surface fretting pad 2, pressing metal sheet 3, force measuring element 4, screw 5, main clamping block 6, main tensioning pin 7, pin 8, auxiliary clamping block 9. Auxiliary tightening pin 10, positioning gasket 11 and threaded rod 12, one group of two sets of semi-circular surface fretting pads 2 is closely attached to the laser peening area 13 on the surface of the round bar sample 1, and the other group is tightly attached to the surface of the round bar sample 1. Pasted on the test contrast area 14 (such as image 3 ), the distance between the two sets of semi-annular micro-movement pads 2 is 5~10mm, two semi-annular compression metal sheets 3 are misplaced and mounted on two sets of semi-annular surface micro-movement pads 2, and ...

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Abstract

The invention discloses a contrast test method for improving the fretting fatigue resistance performance of a material by laser shot blasting strengthening and a test sample clamping device. The device comprises a clamping device, a compacting metal sheet, a force measurement element, circular ring surface micro mats, a test sample subjected to surface modification and the like. The method comprises the following steps: firstly, laser shot blasting strengthening is performed on the side surface region of the whole circumference of a round bar test sample to be tested, a test region which is not subjected to any treatment is retained at an axial adjacent position for contrast, the four circular ring surface micro mats surround the two test regions in a fitting manner, and the compacting metal sheet applies a controllable uniform contact load to the micro pads through the clamping device. Under the surface-surface contact tension-torsion composite fatigue test condition with the same test parameter, the device can realize a contrast between the non-treated region and the region subjected to laser shot blasting strengthening on the fretting fatigue resistance performance according to crack generation and expansion situations of the round bar test sample in different test stages.

Description

technical field [0001] The invention relates to a material modification technology, especially a laser surface strengthening and fretting fatigue test technology, specifically a comparative test method and sample clamping method for improving the anti-fretting fatigue performance of materials by laser shot peening device. Background technique [0002] At present, in the fields of aerospace, automobile manufacturing, shipbuilding, etc., most of the key parts serve in complex and diverse environments such as mechanical vibration, alternating fatigue loads and thermal cycles, which will lead to bolted connections, riveting, dovetail connections and Interference fit and other methods to fasten the contact parts produce a relative displacement with a displacement of tens of microns - fretting. Under the action of normal load, fretting on the contact surface will generate tangential alternating stress, resulting in the initiation and propagation of fretting fatigue cracks. Frett...

Claims

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Application Information

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IPC IPC(8): G01N3/32G01N1/28
Inventor 黄舒王作伟盛杰周建忠徐苏强章海峰王宏宇孙云辉
Owner JIANGSU UNIV
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