Dynamic Caustics Analysis of Oblique Crack Propagation under Blast Loading
To study the dynamic fracture mechanical behavior of rock under blast loading, the crack propagation experiment in material containing a prefabricated oblique flaw was carried out using a transmission caustics system. Varieties of crack propagation velocity, crack extensions acceleration, and the dynamic stress intensity factor at the wing crack tip of the oblique flaw were studied. The relationship of them was analyzed. Experimental results show that two wing cracks appear at both tips of the oblique flaw. The crack velocity and acceleration oscillate as the crack propagates. The changes of the dynamic stress intensity factor also oscillate during the whole propagation process. The values of the dynamic stress intensity factor KdⅠ at the tips of the oblique flaw are bigger than that of the dynamic stress intensity factor KdⅡ. The results of the present research can provide a theoretical basis for the study of practical blasting engineering.
blast loading dynamic caustics oblique crack propagation dynamic stress intensity factor
YANG Renshu YUE Zhongwen YANG Liyun XIAO Tongshe DONG Jucai
School of Mechanics & Civil Engineering, China University of Mining & Technology, Beijing, China Sta State Administration Bureau of Work Safety, Beijing, China
国际会议
The Second Asian-Pacific Symposium on Blasting Techniques(第二届亚太地区爆破技术研讨会)
大连
英文
67-71
2009-07-01（万方平台首次上网日期，不代表论文的发表时间）