花岗岩动态力学性能的实验研究  

Expermental Study for the Dynamic Mechanical Behavior of Granite

作　　者：任兴涛[1,2] 周听清[1] 钟方平[2] 胡永乐[2] 王万鹏[2] 

机构地区：[1]中国科学技术大学近代力学系,安徽合肥230026 [2]西北核技术研究所,陕西西安710024

出　　处：《实验力学》2010年第6期723-730,共8页Journal of Experimental Mechanics

摘　　要：介绍了利用Φ74mm SHPB试验装置进行花岗岩的动态压缩试验和动态劈裂拉伸试验的结果。通过试验获得了花岗岩在100s-1～102s-1应变率加载时的动态力学参数。同时,对试件内的动态应力分布进行了数值模拟,验证了动态试验的有效性。试验结果表明,花岗岩的动态压缩和动态劈裂拉伸的力学性能表现出显著的应变率效应。随着应变率的增加,其冲击压缩破坏应力、冲击压缩破坏应变、弹性模量、冲击压缩应变能密度和动态劈裂拉伸破坏强度均有一定程度的增加。Granite dynamic compression and dynamic tensile tests were carried out by using a Φ74mm split Hopkinson pressure bar setup. Granite dynamic mechanical parameters under different strain rates ranging from 10^0s^-1 to 10^2s^-1 were obtained. At the same time,numerical simulation of dynamic stress distribution in specimens was performed to validate the experiment. Test results show that granite dynamic mechanical behavior of compression and splitting tensile has distinguishable strain rate effect. With the increasing of strain rate,the impact compression failure stress,the impact compression failure strain,the elastic modulus,the strain energy density of impact compression and the failure strength of dynamic splitting tensile present increase with different degrees.

关 键 词：花岗岩 动态压缩 动态劈裂 分离式霍普金森压杆SHPB 应变率效应 

分 类 号：O347[理学—固体力学] TU452[理学—力学]