Identifying elasto-plastic damage coupling model of laser-welded aluminum alloy by virtual field method and digital image correlation
Identifying elasto-plastic damage coupling model of laser-welded aluminum alloy by virtual field method and digital image correlation
复制标题
虚场法与数字图像相关识别激光焊接铝合金弹塑性损伤耦合模型
DOI：
10.1016/j.optlastec.2020.106268
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发表时间：
2020
影响因子：
5
通讯作者：
Li Mingqiang
中科院分区：
文献类型：
--
作者：
Jiang Hao;Lei Zhenkun;Bai Ruixiang;Wu Wen;Liu Da;Guo Zhenfei;Yan Cheng;Dong Honggang;Li Mingqiang
The local high temperature of laser welding affects the mechanical damage properties of aluminum alloy. The full-field strain near the weld of the laser-welded aluminum alloy 6061 under uniaxial tension was obtained using digital image correlation. An iterative stress increment method for the isotropically hardened elasto-plastic damage coupling constitutive model is proposed herein based on the combination of a return mapping scheme and the nonlinear virtual field method. The elasto-plastic damage coupling constitutive parameters and its corresponding stress–strain relationship in each subzone around the weld are established. The results show that the plastic strain accumulating in the heat-affected zone is the fastest, where the damage initiation occurs earlier, and the damage evolution speed is faster than that other zones.
