冲击载荷下盐岩的力学性能和本构关系研究  

Study of the Dynamic Behavior and Constitutive Relation of Salt Rock Acted by Impact Loading

作　　者：刘卫国[1,2] 王肖钧[1] 姜锡权[3] 

机构地区：[1]中国科学技术大学近代力学系 [2]中国人民解放军第96361部队 [3]解放军炮兵学院

出　　处：《实验力学》2012年第3期295-300,共6页Journal of Experimental Mechanics

基　　金：国家重点基础研究发展计划(973计划)项目(2009CB724608);武器装备探索研究(7131013)

摘　　要：利用直径75mm的大尺寸SHPB实验装置开展盐岩的动态压缩性能实验研究,得到了其动态应力应变曲线。分析表明,在冲击压缩载荷作用下,盐岩材料有明显的损伤软化现象和应变率效应。针对实验曲线,通过引入描述材料强度随应变率强化的应变率增强因子和随不可逆变形发展而弱化的损伤因子,提出了含损伤率的相关动态本构模型,拟合得到的本构方程形式比较简单,能够较好地反映盐岩动态实验加载过程的主要特征,具有一定的工程应用价值。A 75mm large-diameter SHPB was used to study the dynamic compression property of salt rock. Dynamic stress-strain curve was obtained, and analysis reveals that the salt rock presents remarkable effect of strain hardening and damage softening. A dynamic constitutive model for the salt rock was proposed by using two variables： one is the strain rate strengthen factor to describe the strain hardening and the other one is the damage factor related to irreversible strain to describe the strain softening. The agreement between the constitutive relation and the experimental results is quite well. The new relation is relatively simple and easy obtained, hence, is worth in engineering application.

关 键 词：盐岩 分离式霍普金森压杆(SHPB) 动态本构关系 损伤软化 

分 类 号：TU458[建筑科学—岩土工程]