Deformation failure behavior and fracture model of twin-roll casting AZ31 alloy under multiaxial stress state

Journal of Materials Research and Technology

Lifeng Ma¹  Hongbo Xie¹  Huaying Li²  Lijuan Wang²  Weitao Jia²  Yuan Yuan³ 

[1] Corresponding author.;College of Mechanical Engineering, Taiyuan University of Science and Technology, Taiyuan, 030024, China;School of Materials Science and Engineering, Taiyuan University of Science and Technology, Taiyuan, 030024, China;

关键词: AZ31 alloy;    Failure behavior;    Fracture criteria;    Stress triaxiality;    Fracture model;   

DOI  :  

来源: DOAJ

【 摘 要 】

The influence of temperature and strain rate on the deformation behavior of twin-roll casting AZ31 alloy has been examined as a function of stress state using notched and un-notched tensile specimens. Failure behavior during the physical tension was carried out using FEM simulations with different fracture criteria. Using a combined experimental-FEM investigation, the applicability of each fracture criterion was verified to serve the prediction for the crack initiation under multiaxial stress state. Results show that the critical fracture strain presents a clear exponential relationship with stress triaxiality and strain rate, and a linear relationship with temperature. Through the quantitative analysis of the relationship, a mathematical model can be well established. After comparison and verification, the fracture model can accurately predict the forming limit during the plastic deformation of twin-roll casted AZ31 magnesium alloy under complex stress state, and the classical Cockcroft & Latham criterion is the most suitable criterion for predicting the related crack initiation.

【 授权许可】

Unknown