Experimental study on opposite cracks propagation behavior under blast loading

YANG Ren-shu; ZUO Jin-jing; YUE Zhong-wen; FANG Shi-zheng; CHEN Shuai-zhi

doi:10.13225/j.cnki.jccs.2017.0413

Abstract：Adopting digital laser dynamic caustics experimental system,research two mutually to expand crack dynamic characteristics and interaction relations under explosion loading.The results showed that:process relative to the propagation of the crack can be divided into three stages:independent extension,repel each other,attract each other,eventually forming connections to form each other,this feature is not change with the crack initial vertical distance under this experimental condition;Crack propagation speed increase sudden when the crack interact in the process of the extension of crack,and the two horizontal distance of the crack tip decreases with the increase of crack initial vertical distance when the crack propagation speed increase;With the change of the two crack initial vertical distance,the two cracks begin interaction when the crack tip on the between 56-70 mm;The largest vertical migration distance of crack position corresponding to the crack tip horizontal distance of zero moment,resulting from relative movement between two initial crack spacing in the vertical direction of the greater the offset distance,the smaller instead.