Transactions of Materials and Heat Treatment

Title：Simulation and analysis on fatigue life of self-piercing riveting for aluminum alloy sheet

Authors： Zheng Qingchun Wang Naixin Zhu Peihao Zhang Tao Wang Bing

Unit： Tianjin University of Technology Zhejiang Geely New Energy Commercial Vehicle Group Co. Ltd.

KeyWords： aluminum alloy self-piecing riveting surface roughness residual stress fatigue life FE-SAFE

ClassificationCode：TH131.1

year,vol(issue):pagenumber：2020,45(9):93-97

Abstract：

The fatigue life prediction model of self-piecing riveting structure for aluminum alloy sheet was established, and based on the finite element software ABAQUS and the fatigue analysis software FE-SAFE, the influence laws of surface roughness and residual stress on the fatigue life of self-piecing riveting components were studied by finite element simulation and mathematical statistics multivariate orthogonal regression experiment. Then, the function relation taking surface roughness, residual stress as independent variables and maximum stress and taking fatigue life as dependent variable was fitted, and the variation trend of fatigue life with surface roughness and residual stress was obtained. The results show that the order of influences of surface roughness, residual stress, the maximum stress and pairwise interaction on the fatigue life is residual stress、interaction of surface roughness and residual stress and surface roughness. When the maximum stress is fixed and the surface roughness is unchanged, the residual stress decreases and the fatigue life increases, and when the residual stress is unchanged, the surface roughness increases and the fatigue life decreases. Finally, the average error between fatigue experiment results and simulation results is 9.74%, which proves that the simulation results are reliable.

Funds：

国家自然科学基金资助项目（61941305）；天津市科技计划项目（19YFFCYS00110）

郑清春（1971-），男，博士，教授 E-mail：zhengqingchun@tjut.edu.cn 通讯作者：朱培浩（1983-），男，博士，副教授 E-mail：zhupeihao_gp@163.com

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