比较93钨合金材料的3种本构模型  

Comparative Analysis of 3 Constitutive Models for 93 Tungsten Alloy

作　　者：陈青山 苗应刚[1] 郭亚洲[1] 李玉龙[1] CHEN Qing-Shan;MIAO Ying-Gang;GUO Ya-Zhou;LI Yu-Long(School of Aeronautics, Northwestern Pol ytechnical University, Xi＇an 710072 ,China)

机构地区：[1]西北工业大学航空学院,陕西西安710072

出　　处：《高压物理学报》2017年第6期753-760,共8页Chinese Journal of High Pressure Physics

摘　　要：在温度范围296~1 273 K、应变率范围0.000 5~6 000s-1内,对93钨合金材料(93%W-4.9%Ni-2.1%Fe)的力学行为进行了系统研究。实验结果表明:钨合金的塑性流动应力对温度和应变率非常敏感,它随温度的降低和应变率的增加而提高;真实塑性应变达到0.6时未出现剪切破坏。针对实验得到的应力-应变关系,分别进行了两种唯象本构模型(JC本构模型和KHL本构模型)和一种基于物理概念的本构模型(PB本构模型)的流动应力拟合。通过误差分析和应变率阶跃实验,对这3种本构模型的预测效果的精度进行了分析和评价。In this research, we carried out a systematic study o{ the mechanical behaviors of the 93 tungsten alloy （93%W-4.9%Ni-2.1%Fe） with a temperature range of 296-1 273 K and a strain rate range of 0. 000 5- 6 000 s^-1. The results demonstrate that the flow stress is highly dependent on the temperature and the strain rate. the flow stress increases with the decrease of temperature and the increase of strain rate,and the shear failure does not occur when the true plastic strain is up to 0.6. Then we introduced and established 3 constitutive models,including two phenomenological constitu-tive models,JC model and KHL model and one physically-based constitutive model,to fit the stress- strain relationship through a procedure of regression analysis and constrained optimization. Finally,we evaluated the fitted results of the 3 constitutive models through a fitting error analysis and a specific strain-rate jump experiment.

关 键 词：钨合金 塑性流动应力 本构模型 

分 类 号：O344.4[理学—固体力学] TG146.411[理学—力学]