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论文类型：期刊论文
发表时间：2021-02-25
发表刊物：OPTICS AND LASER TECHNOLOGY
卷号：129
ISSN号：0030-3992
关键字：Laser welding; Inversion; Elasto-plastic damage coupling constitutive; Return mapping iterative algorithm; Virtual field method; Digital image correlation
摘要：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.