岩土力学2017，Vol.38Issue(8)：2175-2181,7.DOI:10.16285/j.rsm.2017.08.003
爆炸荷载下不对称Y型裂纹扩展规律的试验研究
Study on the regularity of asymmetric Y-shaped cracks propagation under blast loading
摘要
Abstract
Using a dynamic caustics blast loading system,we studied dynamic behavior of asymmetric Y-shaped cracks propagation under blasting loading.It was found that before two opposite moving cracks encountering,their tip singular fields affected each other,the shape of caustics spots distorted and stress fields of the crack tip changed.Moreover,two moving cracks propagated along the deviating horizontal direction,and the deviation angle gradually increased.However,after two opposite moving cracks encountering,the deviation angle gradually decreased,and two moving cracks propagated along the direction of the existing crack.It can be seen that two branched cracks intersected at the main crack,and the wing crack easily initiated from the branched crack with a smaller incident angle of stress wave and a longer length,and propagated along the vertical direction of the maximum tensile stress.However,this kind of branched crack may inhibit the propagation and the stress intensity factor of the branched crack with a larger incident angle and a shorter length.The average values of dynamic stress intensity factor of the branched crack decreased with the increase of the incident angle of stress wave.In addition,the propagation velocity of the branched wing crack presented oscillating change law.Therefore,the results provide a reliable basis for the analysis of crack propagation in practical engineering.关键词
Y型裂纹/爆炸荷载/动焦散/裂纹扩展/动态应力强度因子Key words
Y-shaped cracks/blasting load/dynamic caustics/crack propagation/dynamic stress intensity factor分类
建筑与水利引用本文复制引用
杨仁树,苏洪,龚悦,陈程..爆炸荷载下不对称Y型裂纹扩展规律的试验研究[J].岩土力学,2017,38(8):2175-2181,7.基金项目
国家自然科学基金面上项目(No.51274203,No.51374210) （No.51274203,No.51374210）
高等学校学科创新引智计划资助(No.B14006).This work was supported by the General Program of National Natural Science Foundation of China (51274203,51374210) and the Program of Introducing Talents of Discipline to Universities (B14006). （No.B14006）
