Transactions of Materials and Heat Treatment

Title：Numerical simulation on residual stress field in laser peening with a square spot for 2024-T351 aluminum alloy

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ClassificationCode：V261.8

year,vol(issue):pagenumber：2021,46(5):79-85

Abstract：

In order to analyze the surface and inside residual stress distribution of high-strength aerospace aluminum alloy material represented by 2024-T351 aluminum alloy after laser peening and lay a foundation for the further analysis of plate deformation caused by laser peening, a finite element calculation model of laser shock with a square spot was constructed by software ABAQUS, and the residual stress field induced by laser shock with a square spot was simulated numerically. Then, the spatial distribution characteristics of the residual stress field generated by laser shock in the two cases of no overlap and 25% overlap rate were analyzed. The results show that the residual compressive stress in the center of impact pit is larger and better uniformity, and there is a larger tensile stress and a larger stress gradient at the edge. Furthermore, the validity of the FE model is verified by the experiments of laser peening without overlap and X-ray diffraction stress test, and the surface morphology of specimen is measured and observed by laser displacement sensor.

Funds：

民机专项（MJZ-2017-G-60）

闾家阳（1995-），男，博士研究生 E-mail：lyujy0315@hotmail.com 通讯作者：王俊彪（1963-），男，博士，教授 E-mail：wangjunb@nwpu.edu.cn

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