膨胀柱壳恒定应变率的本构关系  

Constitutive equation of expanding cylindrical shell at constant strain rate

作　　者：郭昭亮[1] 任国武[1] 张世文[1] 汤铁钢[1] 刘仓理[2] 

机构地区：[1]中国工程物理研究院流体物理研究所,四川绵阳621999 [2]中国工程物理研究院,四川绵阳621999

出　　处：《爆炸与冲击》2016年第5期583-589,共7页Explosion and Shock Waves

基　　金：国家自然科学基金项目(11172279;11102191)

摘　　要：考虑到金属柱壳膨胀过程中随机裂纹萌生对测试结果的可能干扰,设计了预置有中心穿透圆孔的柱壳样品,采用多普勒光纤探针测量系统获得了柱壳外壁更优的径向速度历史。基于膨胀柱壳实验中固有的非恒定应变率现象,研究了获得恒定应变率下本构方程的方法,并采用改进后的本构方程确定方法,获得了20钢恒定应变率下的应力应变关系。In this work,taking into account of the interference of random cracks in the expansion process,we designed a cylindrical sample made with a preset hole.Then,using the Doppler pins system（DPS）,we obtained some better curves for the cylinder＇s radial speed histories.Based on the non-constant strain rate phenomena in the expanding ring and expanding cylinder experiments,we conducted experiments and studied a method for obtaining constitutive equation at constant strain rate.The improved constitutive equation method was used to obtain the modified constitutive equation at constant strain rate for 20 steel.

关 键 词：固体力学 本构方程 多普勒光纤探针 膨胀柱壳 恒定应变率 

分 类 号：O347.3[理学—固体力学]