土木与环境工程学报（中英文）2021，Vol.43Issue(1)：72-81,10.DOI:10.11835/j.issn.2096-6717.2019.160
应力状态和应变率对Q690钢延性断裂行为的影响
Stress state and strain rate dependent ductile fracture behavior of Q690 steel
摘要
Abstract
The true stress-strain relationship and ductile fracture characteristics of Chinese Q690 high strength structural steel were investigated at different low strain rates.Sheet Q690 specimens with one unnotched and two different notch geometries were used for uniaxial tensile tests,and pure shear sheet specimens were also used for shear tests.These specimens were loaded to obtain a wide range of stress states.A hybrid experiment-simulation approach was used to determine the equivalent plastic strain to fracture,the stress triaxiality and the Lode parameter.The results showed that the stress triaxiality and the Lode parameter are the key factors controlling fracture,and that the strain is more sensitive to strain rate as compared to stress.It was observed that the equivalent plastic fracture strain increases with increasing strain rate.Further studies are required to design pure shear specimens since it is difficult to realize pure shear stress state on the fracture sections in most of the pure shear tests due to the obvious deformation and stress concentration before a fracture occurs at the gauge area.关键词
高强度结构钢/延性断裂/应力三轴度/罗德参数/应变率Key words
high strength structural steel/ductile fracture/stress triaxiality/Lode parameter/strain rate分类
建筑与水利引用本文复制引用
董俊宏,沙佳阿里阿里,杨波,丁浩敏..应力状态和应变率对Q690钢延性断裂行为的影响[J].土木与环境工程学报（中英文）,2021,43(1):72-81,10.基金项目
National Natural Science Foundation of China (No.51778086) （No.51778086）
