高强石墨材料的动态本构模型  

Dynamic Constitutive Model of High-Strength Graphite Material

作　　者：唐文波[1] 刘德顺[2] 唐思文[3] 李鹏南[1] 

机构地区：[1]湖南科技大学机电工程学院,湘潭411201 [2]湖南科技大学机械设备健康维护湖南省重点实验室 [3]湖南科技大学先进矿山装备教育部工程研究中心,湘潭411201

出　　处：《机械工程材料》2015年第3期84-88,共5页Materials For Mechanical Engineering

基　　金：国家科技重大专项基金资助项目(2012ZX04003051-5)

摘　　要：利用分离式Hopkinson压杆试验装置对SMF-800高强石墨进行了冲击压缩试验,获得了不同应变速率(618,868,1 185s-1)下的应力-应变曲线;采用损伤型朱-王-唐粘弹性本构模型和一维弹脆性损伤本构模型分别对应力-应变曲线进行拟合,并对拟合结果进行了对比。结果表明:高强石墨材料的破坏应力和应变随着应变速率的增大而不断增大;损伤型朱-王-唐粘弹性本构模型比一维弹脆性本构模型更能有效描述高强石墨材料的动态力学性能,在应变速率为618,868,1 185s-1时,前者拟合曲线的相关指数分别为0.992 15,0.999 52,0.972 15。Impact compression tests of high-strength graphite SMF-800 were carried out using a split Hopkinson pressure bar（SHPB）testing system,and the stress and strain curves at strain rates of 618,868s-1and1 185s-1 were obtained.And the stress-strain curves were fitted by the damage ZWT viscoelastic constitutive model and the one dimensional elastic brittle damage constitutive model,and fitting results were compared.The results show that the destruction stress and strain increase with the increase of strain rate.The damage ZWT viscoelastic constitutive model is more effective than the one dimensional elastic brittle damage constitutive model to describe the dynamic mechanical properties of the high-strength graphite material.Moreover,the fitting related indexes of the damage ZWT viscoelastic constitutive model were up to 0.992 15,0.999 52 and 0.972 15,respectively,at strain rates of 618,868s-1and 1 185s-1.

关 键 词：高强石墨 动态力学性能 分离式HOPKINSON压杆 朱-王-唐粘弹性本构模型 

分 类 号：TH145.1[一般工业技术—材料科学与工程]