锻压技术

2024-T351铝合金方形光斑激光喷丸残余应力场数值模拟

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

作者：闾家阳王永军王俊彪黄遐曾元松

关键词：2024-T351铝合金激光喷丸残余应力搭接 ABAQUS

分类号：V261.8

出版年,卷(期):页码：2021,46(5):79-85

摘要：

为了分析激光喷丸作用后，以2024-T351铝合金为代表的高强航空铝合金材料表面和内部残余应力的分布情况，并为后续板料激光喷丸变形分析打下基础，在ABAQUS软件平台上，构建了一种方形光斑激光冲击的有限元计算模型，对方形光斑激光冲击诱导的残余应力场进行了数值模拟，分析了在无搭接和搭接率为25%的两种情况下，激光冲击产生的残余应力场在空间上的分布特征，发现冲击坑中心处残余压应力值较大且均匀性较好，边缘处出现了较大的拉应力且应力梯度较大。通过进行无搭接的激光喷丸实验和X射线衍射应力测试实验，验证了有限元模型的有效性。试件表面形貌通过激光位移传感器进行了测量观察。

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.

基金项目：

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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