A mesoscopic damage model for the low-cycle fatigue of an extruded magnesium alloy

被引：10

作者：

Wang, Ziyi ^{[1
]}

Wu, Shengchuan ^{[2
]}

Lei, Yu ^{[1
]}

Li, Hang ^{[1
]}

Yu, Chao ^{[1
]}

Zhou, Kun ^{[3
]}

Feng, Xiqiao ^{[4
]}

Kang, Guozheng ^{[1
]}

机构：

[1] Southwest Jiaotong Univ, Sch Mech & Aerosp Engn, Appl Mech & Struct Safety Key Lab Sichuan Prov, Chengdu 610031, Peoples R China

[2] Southwest Jiaotong Univ, State Key Lab Tract Power, Chengdu 610031, Peoples R China

[3] Nanyang Technol Univ, Singapore Ctr Printing 3D, Sch Mech & Aerosp Engn, Singapore 639798, Singapore

[4] Tsinghua Univ, Inst Biomech & Med Engn, Dept Engn Mech, Beijing 100084, Peoples R China

来源：

INTERNATIONAL JOURNAL OF PLASTICITY | 2023年 / 165卷

基金：

中国国家自然科学基金;

关键词：

Extruded AZ31 mg alloy; Twin; Dislocation slip; Low -cycle fatigue; Mesoscopic damage model; TRANSFORMATION-INDUCED PLASTICITY; CRACK NUCLEATION; MG ALLOY; DEFORMATION; BEHAVIOR; STRAIN; STRESS; METALS; ENERGY; SHEET;

D O I：

10.1016/j.ijplas.2023.103615

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

This paper presents a novel mesoscopic damage model to characterize the low-cycle fatigue damage evolution of an extruded AZ31 magnesium (Mg) alloy, taking into account the effect of twinning. The damage caused by the slip bands (SBs)-twin boundaries (TBs) and SBs-grain boundaries (GBs) interactions is treated based on the Tanaka-Mura model and the Eshelby in-clusion theory. Strain energy values at the TBs and GBs are defined as the TB and GB damage variables, respectively. Explicit formulae for the TB and GB damage evolution are derived from the characteristics of the {1012} extension twin and the basal texture. A fracture energy-based crack initiation criterion is established, and the proposed damage model is validated against the existing experimental results. The model demonstrates its ability to reproduce the damage evolution processes, and the predictions of the crack initiation life are within the twice error band.

引用

页数：16

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