Development of an improved MMC-based fracture criterion characterizing the anisotropic and strain rate-dependent behavior of 6061-T5 aluminum alloy

被引：20

作者：

Ji, Cheng ^{[1
]}

Li, Zhigang ^{[1
]}

Liu, Jianguang ^{[2
]}

机构：

[1] Beijing Jiaotong Univ, Sch Mech Elect & Control Engn, Beijing 100044, Peoples R China

[2] COMAC Beijing Aircraft Technol Res Inst, Beijing Key Lab Civil Aircraft Struct & Composite, Beijing 102211, Peoples R China

来源：

MECHANICS OF MATERIALS | 2020年 / 150卷 / 150期

基金：

中国国家自然科学基金;

关键词：

Fracture criterion; MMC; Strain rate; Anisotropy; 6061-T5 aluminum alloy; UMAT; DUCTILE FRACTURE; MOHR-COULOMB; YIELD FUNCTION; FAILURE; SHEETS; PREDICTION; METALS;

D O I：

10.1016/j.mechmat.2020.103598

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Fracture behavior of aluminum alloy under complex loading conditions is of particular interest to researchers and practitioners. In this study, tensile tests were carried out on 6061-T5 aluminum alloy specimens at different stress triaxialities and Lode angles under different loading directions at various strain rates. The Hill48 yield criterion and a self-developed hardening model were combined to describe the anisotropic yielding and strain rate-dependent hardening behavior of 6061-T5 aluminum alloy. An improved MMC-based fracture model was developed to describe the anisotropic and strain rate-dependent fracture characteristics of 6061-T5 aluminum alloy and the parameters were calibrated by using a combined experimental-numerical approach. The improved MMC-based model was implemented into LS-DYNA as UMAT for the numerical simulation. By using the proposed fracture criterion, simulation results were highly consistent with experimental ones, which prove the reliability of the improved fracture criterion.

引用

页数：14

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