Influence Rule of Process Parameters on Residual Stress Cave Induced by Laser Shock

CHENG Xiuquan; YAN Chang; CHENG Sizhu; XIA Qinxiang

doi:10.11973/jxgccl201911012

Materials and Mechanical Engineering > 2019 > 43(11): 53-56,61. > DOI: 10.11973/jxgccl201911012

CHENG Xiuquan, YAN Chang, CHENG Sizhu, XIA Qinxiang. Influence Rule of Process Parameters on Residual Stress Cave Induced by Laser Shock[J]. Materials and Mechanical Engineering, 2019, 43(11): 53-56,61. DOI: 10.11973/jxgccl201911012

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Influence Rule of Process Parameters on Residual Stress Cave Induced by Laser Shock

1. School of Aircraft Maintenance Engineering, Guangzhou Civil Aviation College, Guangzhou 510403, China;
2. School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou 510640, China

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Received Date: June 21, 2019
Revised Date: October 17, 2019

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Abstract

The concepts of relative cave depth, relative cave width and stress loss ratio of residual stress cave were introduced by establishment of the residual stress cave math model. The effect of shock energy (1.0-3.0 J), spot diameter (1.0-3.0 mm), shock number (1-5 times) and spot overlap ratio (30%-70%) on residual stress cave was quantitatively analyzed by finite element model verified by experiment. The results show that stress loss ratios caused by residual stress cave were all very small, which were all less than 3%; relative cave widths were all less than 20%; the variation range of relative cave depths was large, which was 0-70%, and relative cave depth was the main factor to affect the uniformity of surface residual stress. In order to improve the uniformity of surface residual stress, when the relative cave depth of single residual stress cave was more than 10%, the spot overlap method should be used to shock peening, and the distance between two neighbouring spot center should be equal to the opening radius of the residual stress cave.
- laser shock,
- surface peening,
- residual stress cave,
- stress loss ratio,
- quantitative analysis

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