爆炸与冲击2018，Vol.38Issue(4)：834-840,7.DOI:10.11883/bzycj-2016-0387
高氮奥氏体不锈钢高温动态响应特性及本构关系
Dynamic mechanical behaviors of high-nitrogen austenitic stainless steel under high temperature and its constitutive model
王彦莉 1贾古寨 1张婷 1万明明 1纪伟 1牟晓明1
作者信息
- 1. 中国兵器工业第五二研究所烟台分所,山东 烟台 264000
- 折叠
摘要
Abstract
Mechanical tests of high-nitrogen austenitic stainless steel (HNS) were performed at strain rales of 102-103 s-1 generated by a split Hopkinson bar apparatus and under different temperatures from 293 K to 873 K. The influences of strain rate and temperature on the plastic flow stress of HNS were analyzed by comparing the dynamic tests with quasi-static tests. The results show that the dynamic mechanical behavior of HNS is significantly sensitive to strain rate and temperature; the flow stress increases rapidly when strain rate exceeds 400 s-1; and at the same strain rate, the flow stress increases as temperature decreases. The coupling effect of strain rate and temperature on the plastic deformation behavior of HNS was investigated. The results indicate that the thermal softening effect plays a key role in the dynamic plastic deformation process of HNS. Based on the classical Johnson-Cook constitutive model, a modified Johnson-Cook constitutive model was given which can describe the dynamic mechanical behavior of HNS properly.关键词
动态力学行为/J-C本构方程/HNS/温度软化效应Key words
dynamic mechanical behavior/Johnson-Cook constitutive model/HNS/thermal softening effect分类
数理科学引用本文复制引用
王彦莉,贾古寨,张婷,万明明,纪伟,牟晓明..高氮奥氏体不锈钢高温动态响应特性及本构关系[J].爆炸与冲击,2018,38(4):834-840,7.
