花岗岩在冲击荷载下的动态力学性能研究  

Study on Dynamic Mechanical Properties and Energy Evolution of Granite Under Impact Load

作　　者：刁宏炜 刘俊新[1] 任天彬 廖文军 王狄 DIAO Hong-wei;LIU Jun-xin;REN Tian-bin;LIAO Wen-jun;WANG Di(School of Civil Engineering and Architecture,Southwest University of Science and Technology,Mianyang 621010,China)

机构地区：[1]西南科技大学土木工程与建筑学院,绵阳621010

出　　处：《武汉理工大学学报》2024年第12期97-102,共6页Journal of Wuhan University of Technology

基　　金：四川省科技计划重点研发项目(2024YFFK0415)。

摘　　要：为了探究花岗岩在冲击荷载下的动态力学响应特性,将选取的花岗岩材料加工成?50 mm×30 mm的圆柱试件进行SHPB试验。研究结果表明:在冲击荷载下花岗岩应力-应变曲线峰值应力随应变率的增大而增大,呈正线性相关。花岗岩在动态压缩破碎过程中,能量时程曲线包括3个阶段:压密阶段、能量累积阶段、破碎稳定阶段。当入射能量低于640 J时,大部分能量转化为耗散能,当入射能量大于640 J时,大部分能量转化为反射能。反射能随入射能的增加呈幂函数增加,且增长率越来越大。耗散能随入射能的增加呈指数增加,且增长率越来越小。可以预见,当入射能持续增加,耗散能慢慢稳定于固定值。In order to investigate the dynamic mechanical response characteristics of granite under impact load, the selected granite samples were processed into 50 mm×30 mm cylindrical specimens for SHPB test.The results show that the peak stress of granite stress-strain curve increases with the increase of strain rate under impact load, which is positively linear.In the process of dynamic compression and crushing of granite, the energy time history curve includes three stages: compaction stage, energy accumulation stage and crushing stability stage.When the incident energy is less than 640 J,most of the energy is converted to dissipative energy, and when the incident energy is greater than 640 J,most of the energy is converted to reflected energy.The reflected energy increases as a power function with the increase of incident energy, and the growth rate is increasing.The dissipative energy increases exponentially with the increase of incident energy, and the growth rate becomes smaller and smaller.It can be predicted that when the incident energy continues to increase, the dissipative energy slowly stabilizes at a fixed value.It can be predicted that when the incident energy continues to increase, the dissipative energy slowly stabilizes at a fixed value.

关 键 词：SHPB 花岗岩 动态力学 应变率效应 能量演化 

分 类 号：TU45[建筑科学—岩土工程]