Ductile fracture model for structural steel under cyclic large strain loading

被引:82
作者
Jia, Liang-Jiu [1 ,2 ]
Kuwamura, Hitoshi [3 ]
机构
[1] Tongji Univ, Res Inst Struct Engn & Disaster Reduct, Shanghai 200092, Peoples R China
[2] Meijo Univ, Adv Res Ctr Nat Disaster Risk Reduct, Tempaku Ku, Nagoya, Aichi 4688502, Japan
[3] Univ Tokyo, Sch Engn, Dept Architecture, Bunkyo Ku, Tokyo 1138656, Japan
关键词
Ductile fracture; Cyclic loading; Structural steel; Chaboche model; Yoshida-Uemori model; VOID GROWTH-MODEL; HYDROSTATIC-PRESSURE; TENSILE FRACTURE; PLASTICITY; INITIATION; DAMAGE; INSTABILITY; SPECIMENS; CRITERIA; FATIGUE;
D O I
10.1016/j.jcsr.2014.12.002
中图分类号
TU [建筑科学];
学科分类号
0813 ;
摘要
This paper aims to predict ductile fracture of mild steel under cyclic large strain loading (CLSL) using only tensile coupon test results. A micromechanics-based fracture model which adopts void growth model and Miner's rule in incremental form is proposed, where fracture is assumed to occur when a damage index reaches unit. Damage is postulated not to accumulate when stress triaxiality is less than a threshold. To calibrate the fracture model, cyclic experimental and numerical studies on hourglass-type coupons are conducted under various loading histories. Since cyclic plasticity models play an important role on the simulation results, two cyclic plasticity models are employed to carry out the simulation, in which the proposed fracture model is employed. The predicted fracture displacements using either of the plasticity models compare with the experimental results with acceptable accuracy. (C) 2014 Elsevier Ltd. All rights reserved.
引用
收藏
页码:110 / 121
页数:12
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