爆炸载荷作用下静裂纹对运动裂纹扩展影响的实验研究

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振动与冲击 ›› 2018, Vol. 37 ›› Issue (13) : 65-70.

论文

杨仁树1,2,左进京1,肖成龙1,史国利1

作者信息 +

Tests for interaction between static crack and dynamic one under explosion loading

YANG Ren-shu1,2,ZUO Jin-jing1,XIAOCheng-long1,SHIGuo-li1

Author information +

文章历史 +

摘要

采用数字激光动态焦散线实验系统，研究爆炸载荷下静裂纹与动裂纹相互作用的影响规律。结果表明：在爆炸载荷作用下，动裂纹与静裂纹贯通，随着预制裂纹起裂点与静裂纹间距L的增大，翼裂纹平均扩展长度逐渐减小，L增大到一定值时，翼裂纹无法起裂；动裂纹的扩展速度和动态应力强度因子在接近静裂纹时呈现出减小的趋势，由于动裂纹尖端应力场的影响，静裂纹两端出现明显的焦散斑；随着间距L的增大，翼裂纹的扩展速度和应力强度因子逐渐减小；翼裂纹扩展过程中的动态特性随间距L的改变表现出明显的差异性，间距L增大，翼裂纹的扩展速度峰值和动态应力强度因子峰值减小。

Abstract

Adopting a digital laser dynamic caustic test system, the interaction between dynamic crack and static one under explosion loading was studied. The results showed that under explosion loading, dynamic crack and static one link up each other, the average propagation length of wing crack decreases with increase in the distance L between the tip of dynamic crack and static one; the wing crack can't start crack when L reaches a certain value; dynamic crack propagation velocity and the stress intensity factor decrease when dynamic crack is close to static one; due to the effects of dynamic crack tip stress field, obvious caustic speckle appears at two ends of static crack; with increase in L, wing crack extension speed and the dynamic stress intensity factor gradually decrease; wing crack’s dynamic characteristics have an obvious diversity with variation of L; with increase in L, the peak values of wing crack propagation speed and dynamic stress intensity factor decrease.

导出引用

杨仁树1,2,左进京1,肖成龙1,史国利1. 爆炸载荷作用下静裂纹对运动裂纹扩展影响的实验研究[J]. 振动与冲击, 2018, 37(13): 65-70

YANG Ren-shu1,2,ZUO Jin-jing1,XIAOCheng-long1,SHIGuo-li1. Tests for interaction between static crack and dynamic one under explosion loading[J]. Journal of Vibration and Shock, 2018, 37(13): 65-70

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