摘要
利用大直径霍普金森压杆径向冲击中心直裂纹巴西圆盘(CSTBD)砂岩试样,完成Ⅰ型动态断裂实验。利用实验-数值方法确定了不同动态加载率下砂岩的动态起裂韧度;结合实验-数值法以及普适函数确定了不同裂纹扩展速度下砂岩的动态扩展韧度。为验证普适函数法和实验-数值法的有效性,将实验所得结果与其他学者的研究成果进行了对比分析,得到了相同的规律。所确定的岩石动态起裂韧度和动态扩展韧度分别随动态加载率的提高和裂纹扩展速度的提高而增加。
The CSTBD （cracked straight-through Brazilian disc） specimens of sandstone were diametrically impacted by the split Hopkinson pressure bar of large diameter in the mode-Ⅰ （opening mode） rock dynamic fracture test. The experimental-numerical method was employed to obtain the dynamic initiation toughness under different dynamic loading rates; and based on some theoretical analysis and reasonable simplification, the experimental-numerical method and universal function were employed to obtain the dynamic propagation toughness with different crack velocities. In order to verify the validity of the universal function and the experimental-numerical method, comparisons with well-established references of concern were made, and our results present the same law of phenomena as those derived from other researchers. Increases in the dynamic initiation toughness and the dynamic propagation toughness were observed with increasing dynamic loading rate and crack tip speed, respectively.
出处
《爆炸与冲击》
EI
CAS
CSCD
北大核心
2014年第3期264-271,共8页
Explosion and Shock Waves
基金
国家自然科学基金项目(51179115)~~
关键词
固体力学
动态起裂韧度
动态扩展韧度
实验-数值法
普适函数
中心直裂纹巴西圆盘
solid mechanics； dynamic initiation toughness； dynamic propagation toughness； experi-mental-numerical method
universal function； cracked straight-through Brazilian disc （CSTBD）
