冲击作用下静止裂纹与运动裂纹相互作用的试验研究  

Experimental study of interaction between stationary crack and moving crack under impact

作　　者：杨仁树[1] 苏洪[1] 龚悦[2] 邱鹏[1] 付晓强[1] 张士春[1] YANG Renshu;SU Hong;GONG Yue;QIU Peng;FU Xiaoqiang;ZHANG Shichun(School of Mechanics and Civil Engineering,China University of Ming and Technology,Beijing 100083,China;School of Chemical Engineering,Anhui University of Science and Technology,Huainan 232001,China)

机构地区：[1]中国矿业大学(北京)力学与建筑工程学院,北京100083 [2]安徽理工大学化学工程学院,安徽淮南232001

出　　处：《振动与冲击》2018年第8期107-112,共6页Journal of Vibration and Shock

基　　金：国家自然科学基金面上项目(51374210);国家重点研发计划(2016YFC0600903);高等学校学科创新引智计划资助(B14006)

摘　　要：为了研究静止裂纹与运动裂纹相互作用机制,采用数字激光动焦散系统进行了含不同长度预制裂纹的冲击试验。试验结果表明:竖向主裂纹起裂时的应力强度因子和起裂时间均随水平主裂纹长度增加逐渐减小,水平主裂纹长度越长竖向主裂纹更易起裂;竖向主裂纹朝水平主裂纹扩展阶段,其翼裂纹的应力强度因子均值和扩展速度峰值、均值均随着水平主裂纹长度增加而降低;翼裂纹与水平主裂纹汇聚后,在水平主裂纹停滞的时间和水平主裂纹起裂时的应力强度因子均随着水平主裂纹长度增加呈现先减小后增大趋势。In order to study the mechanism of the interaction between the stationary crack and the moving crack,the impact experiments of the pre-cracks with different length were carried out by a digital-laser dynamic caustics test system.Experimental results show that the initiation stress intensity factor and the initiation time of the vertical main crack decrease with horizontal main crack length.The longer the horizontal main crack length,the easier the vertical main crack initiation.During the vertical main crack propagating towards the horizontal main crack,the mean value of the stress intensity factor of the wing crack and the peak value and the mean value of wing crack propagation velocity decrease with horizontal main crack length.After the wing crack and the vertical main crack coalescence,stagnation time and the initiation stress intensity factor of the vertical main crack first decreases and then increases with vertical main crack length.

关 键 词：冲击荷载 动焦散 裂纹长度 运动裂纹 动态应力强度因子 

分 类 号：TD2[矿业工程—矿井建设]