Transactions of Materials and Heat Treatment

Title：Applicability of shear modified GTN model under variable path loading with tension and shearing

Authors： Wang Tingting Zhuang Xincun Zhao Zhen

Unit： Shanghai Jiao Tong University

KeyWords： non-proportional loading GTN model strain path fracture mechanism AA2024 aluminum alloy

ClassificationCode：TG113.2

year,vol(issue):pagenumber：2017,42(5):133-140

Abstract：

In order to evaluate the applicability of the shear enhanced GTN damage model under non-proportional loading, based on a set of notched round bar tests results under torsion-tension variable path loading, a parallel simulation analysis was carried out by the ABAQUS/Explicit with VUMAT subroutine. The results show that under the condition of tension-torsion variable path loading with large pre-deformation, the growth of pre-strain speeds up the growth rate of voids in the subsequent tension process and results in the material fracture in advance. In addition, combining with the fracture macro and micro morphologies, the damage evolution mechanism under non-proportional loading process was investigated. The fracture mechanism of aluminum alloy AA2024 under the condition of tension-shear variable path loading is a tension-shear mixed fracture, and the shear fracture becomes the dominant fracture mode with the increasing pre-torsion.

Funds：

国家自然科学基金资助项目（51105250）

王婷婷（1991-），女，硕士研究生庄新村（1980-），男，博士，副教授

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