黑云母花岗岩对冲击荷载的动态力学响应

Dynamic MechanicaL Response of Biotite Granite under Shock Loading

为了研究黑云母花岗岩对冲击荷载作用时的动态力学响应,采用大直径分离式Hopkinson压杆装置对黑云母花岗岩进行了动态压缩及动态劈裂抗拉试验,分析了黑云母花岗岩的动态压缩应力-应变曲线、动态压缩破坏形态以及动态劈裂抗拉强度等动态力学参数随着冲击荷载的变化规律。结果表明:黑云母花岗岩的动态抗压强度随着子弹冲击加载速度的增加而明显提高,在15.0m/s左右时,动态抗压强度达到347.1MPa;随着子弹冲击加载速度的增加,黑云母花岗岩破坏的形式是从块状到粉状;与静态劈裂抗拉强度相比,动态劈裂抗拉强度也有较大幅度的提高。

In order to study the dynamic mechanical response of biotite granite,the dynamic compression and tensile tests to biotite granite sample are implemented by the SHPB experimental device system.The dy-namic compression and tensile mechanical properties are investigated.Experimental results indicate that the dynamic compressive strength increases with impact speed increasing,and reaches to 347.1 MPa when impact speed arrives at 15.0 m/s.The dynamic compressive fracture form changes from mass to powder failure when the impact speed increases.Compared with static tensile strength,the dynamic tensile strength increases significantly.