Ductile fracture of Q460 steel: Effects of stress triaxiality and Lode angle

材料科学 聚结(物理) 复合材料 断裂(地质) 空隙(复合材料) 剪切(地质) 延展性(地球科学) 结构工程 压力(语言学) 语言学 天体生物学 物理 工程类 哲学 蠕动
作者
Wenchao Li,Fangfang Liao,Tianhua Zhou,Harm Askes
出处
期刊:Journal of Constructional Steel Research [Elsevier BV]
卷期号:123: 1-17 被引量:108
标识
DOI:10.1016/j.jcsr.2016.04.018
摘要

The ductile fracture characteristics of Chinese Q460 high strength structural steel under quasi-static condition were studied by using mechanical tests of four types of notched specimens. The influence of stress state on fracture mechanism of the material was investigated by observing the fracture surfaces of all test specimens using the Scanning Electron Microscope. Meanwhile, corresponding numerical simulations were conducted to collect the critical stress and strain at notch for all test specimens. The effects of stress triaxiality and Lode angle parameter, which were found to be the key parameters governing the ductile fracture of metallic material in many studies, on fracture strain of the Q460 structural steel were investigated. The analysis results show that different fracture mechanisms were observed in different stress triaxiality regions. At high stress triaxialities, Q460 steel exhibits a typical mechanism of “void nucleation, growth and coalescence”. When stress triaxiality equals to zero, a shear fracture mechanism was observed. At low stress triaxiality values, fracture develops as a combination of shear and void growth modes. In addition, the ductility of Q460 structural steel under pure shear or plane strain is lower than that under axisymmetric tension, especially at low stress triaxiality.
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