铝合金冲击凹坑缺陷表面复杂残余应力的有限元模拟  

Finite Element Simulation of Complex Residual Stress on Aluminum Alloy Impact Pit Defect Surface

作　　者：郝建群 周储伟[1] 倪阳[1] 周世友 HAO Jian-qun,ZHOU Chu-wei,NI Yang,ZHOU Shi-you(Nanjing University of Aeronautics ＆ Astronautics, National Laboratory of mechanical structural mechanics and control.,Nanjing 210000,China)

机构地区：[1]南京航空航天大学机械结构力学与控制国家实验室,江苏南京210000

出　　处：《世界有色金属》2018年第16期243-246,共4页World Nonferrous Metals

摘　　要：目前基于纳米压痕技术测量材料残余应力的方法主要应用于薄膜、涂层和喷丸等表面技术上,尚未被广泛用于冲击凹坑缺陷附近残余应力的测量。本文采用有限元方法模拟了2A12铝合金冲击凹坑缺陷的产生和纳米压痕实验的加、卸载过程,根据模拟结果得到的载荷深度曲线,使用Lee模型计算出的凹坑底部残余应力值和有限元模拟的标准值相比误差在6%以内,凹坑边缘的残余应力值和有限元模拟的标准值相比误差在25%以内,验证了基于纳米压痕技术测量金属材料冲击凹坑缺陷附近残余应力方法的适用性。At present, nanoindentation technology is mainly used to measure the residual stress of materials on the surface of thin films, coatings and shot peening technology, but it has not been widely used to measure the residual stress near the impact pit defect. In this paper, the finite element method is used to simulate the formation of impact pit defect and the loading and unloading process of nanoindentation experiment of 2A12 aluminum alloy. According to the load depth curve obtained from the simulation results, the residual stress at the bottom of the pit calculated by Lee model is less than 6% compared with the standard value of finite element simulation, and the residual stress at the edge of the pit is less than 6%. The error between the residual stress and the standard value of finite element simulation is less than 25%, which verifies the applicability of the method based on nanoindentation to measure the residual stress near the impact pit of metal materials.

关 键 词：铝合金 残余应力 有限元模拟 纳米压痕技术 

分 类 号：TQ171.1[化学工程—玻璃工业]