Investigation of deformation damage and fracture in combined stress state for 5052-Al alloy based on experiment and simulation

Xueli Wang, Fuguo Li, Yulin Zhou, Tarek Khelfa, Bang Liu, Yingying Wang, Tianyu Xu, Yong Li, Liang Luo, Farah Siddique

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8 引用 (Scopus)

摘要

In this paper, the deformation damage and fracture behavior of 5052-Al alloy specimens were analyzed in a combined stress state. These were respectively described by relating mathematical models of combination constitutive relationship, cumulative damage criterion, and equal-energy fracture locus. The effective laws of critical damage valueDf, micro-void expansion exponent A, and micro-void coalesce exponent B on damage evolution were also discussed. As well as the influence of the ratio α of critical fracture shear stress τ0 to normal stress σ0, the stress triaxiality T, also represents a relationship between elastic dilatational (dW/dV)v and elastic distortional (dW/dV)d strain energy density. Furthermore, the energy weighting factor β on fracture locus was considered. Simultaneously, the parameters of related mathematical models were quantified by experiments, and some model parameters were calibrated for the first time, such as A, B and β. The deformation damage and fracture process of specimens were simulated and analyzed with the mathematical models of combination constitutive relationship, cumulative damage criterion, and equal-energy fracture locus. Moreover, the fracture mechanism of deformation samples was also discussed through a dominated ductile fracture phenomenon, from macroscopic/microscopic fracture morphology. The results indicated that numerical outcomes are consistent with the experimental ones and the combination constitutive relationship combining damage criterion with fracture locus can describe the deformation behavior of materials.

源语言英语
文章编号107347
期刊Engineering Fracture Mechanics
240
DOI
出版状态已出版 - 12月 2020

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