Experimental study on dynamic fracture behavior of three-point bending beam with double deformity inclusions  

含异型双夹杂三点弯曲梁动态断裂行为的实验研究（英文）

作　　者：岳中文[1] 宋耀[1] 韩瑞杰[1] 张旺[1] 郭超[1] 

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

出　　处：《Journal of Southeast University(English Edition)》2016年第3期333-338,共6页东南大学学报（英文版）

基　　金：The National Basic Research Program of China(973 Program)(No.2011CB606105);the National Natural Science Foundation of China(No.51374210,51134025)

摘　　要：The dynamic fracture behavior of the three-point bending beam with double deformity inclusions under impact loading is studied by using digital high-speed photography in combination with the transmission-type dynamic caustic method. The experimental results indicate that the fluctuation of crack propagation velocity v first increases and then decreases in the crack propagation process. During the process of crack propagating into the inclusion area, the fracture resistance effect of the circular inclusion is the most significant and the effects of triangular and square inclusions are less obvious. The stress intensity factor near the crack tip increases during the propagation process and reaches its maximum value when the crack tip is close to the inclusions. The crack tip’s dynamic stress intensity factor （ DSIF） decreases when the crack exceeds the middle area of the double inclusions. These results provide an experimental basis and scientific foundation to strengthen the evaluation and fracture analysis of the structure containing deformity inclusions.利用数字式高速摄影与透射式动态焦散线光学技术相结合的方法,对含异型双夹杂三点弯曲梁在冲击载荷作用下的动态断裂力学行为进行了研究.实验研究结果表明:裂纹扩展过程中,裂纹扩展速度v经历了波动性增大再减小的过程;在裂纹扩展至夹杂中间区域过程中,圆形双夹杂对裂纹的阻裂作用最强,三角形双夹杂和正方形双夹杂的阻裂作用较弱;裂纹在距离夹杂较远处向夹杂扩展过程中,裂尖应力强度因子波动性增加;当裂尖靠近夹杂时,其裂尖应力强度因子达到最大值.当裂纹扩展超出夹杂所对应中间区域,裂尖应力强度因子出现波动性降低趋势.研究成果为含异型夹杂结构的强度评估及断裂分析提供实验依据及科学基础.

关 键 词：dynamic caustics deformity inclusion dynamic stress intensity factor crack propagation velocity 

分 类 号：O346.1[理学—固体力学]