爆炸应力波作用下空孔周围裂纹群的扩展规律

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振动与冲击 ›› 2018, Vol. 37 ›› Issue (14) : 74-78.

论文

杨仁树1,2,左进京1,宋俊生1,陈帅志1,肖成龙1

作者信息 +

Experimental study on the extension rule of crack group around a hole under explosive stress wave

YANG Ren-shu^1,2,ZUO Jin-jing¹,SONG Jun-sheng¹,CHEN Shuai-zhi¹,XIAO Cheng-long¹

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文章历史 +

摘要

为探究爆炸载荷下空孔应力集中区裂纹群扩展规律，采用爆炸加载透射式焦散线系统，研究单炮孔作用下空孔周围预制裂纹扩展的动态行为。研究结果表明：在空孔与炮孔连线方向上，空孔迎爆侧、背爆侧预制裂纹起裂并扩展，其余方向预制裂纹没有扩展，背爆侧裂纹扩展长度大于迎爆侧裂纹扩展长度；迎爆侧、背爆侧裂纹不会同时起裂，两者起裂时间差为40μs左右，迎爆侧裂纹在扩展阶段的速度和应力强度因子峰值大于背爆侧裂纹相应值；空孔对于爆生裂纹的导向作用随炮孔与空孔距离L的增大越来越不明显，迎爆侧、背爆侧裂纹扩展速度、应力强度因子值随着L的增大而减小。

Abstract

In order to explore the extension rule of a crack group around and emptyhole in the stress concentration region under explosion loading, tests, adopting a dynamic caustics system of explosion loading transmission type, were carried out to investigate the dynamic extension behaviors of a prefabricated crack group around an empty hole under the explosion from a single blasthole. The experimental results show that in the direction of the connection line between the emptyhole and blasthole, at the meetingblast side and backblast side, the prefabricated cracks initiate to expand, while in the rest directions, the prefabricated cracks do not.The length of crack propagation at the backblast side is longer than that at, the meetingblast side.The cracks at the meetingblast side and backblast side do not start to expand at the same time. The timelag between the two initiationsis about 40 μs. The peak values of velocity and stress intensity factor at themeetingblast side is larger than those at the backblast side. The effect of the voids on the crack initiation becomes less and less obvious as the distance L increases. The crack growth velocity and the stress intensity factor at both sides decrease with the increase of L.

导出引用

杨仁树1,2,左进京1,宋俊生1,陈帅志1,肖成龙1. 爆炸应力波作用下空孔周围裂纹群的扩展规律[J]. 振动与冲击, 2018, 37(14): 74-78

YANG Ren-shu1,2,ZUO Jin-jing1,SONG Jun-sheng1,CHEN Shuai-zhi1,XIAO Cheng-long1. Experimental study on the extension rule of crack group around a hole under explosive stress wave[J]. Journal of Vibration and Shock, 2018, 37(14): 74-78

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