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岳中文*,胡庆文,王煦,张旺.冲击载荷下含空孔三点弯曲梁的动态断裂行为[J].实验力学,2017,32(4):463~471
冲击载荷下含空孔三点弯曲梁的动态断裂行为
On the Dynamic Fracture Behavior of Three-Point Bending Beam with Empty Hole and Subjected to Impact Loading
投稿时间: 2017-02-17  最后修改时间: 2017-04-01
DOI:10.7520/1001-4888-17-025
中文关键词:  冲击载荷  动态应力强度因子  动态焦散线  空孔
英文关键词:impact loading  dynamic stress intensity factor  dynamic caustics  empty hole
基金项目:国家自然科学基金面上项目(51374210)资助; 开放自然基金面上项目(KFJJ17-01M)资助
作者单位
岳中文* 中国矿业大学(北京)力学与建筑工程学院, 北京 100083 
胡庆文 中国矿业大学(北京)力学与建筑工程学院, 北京 100083 
王煦 中国矿业大学(北京)力学与建筑工程学院, 北京 100083 
张旺 中国矿业大学(北京)力学与建筑工程学院, 北京 100083 
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中文摘要:
      为得到圆孔缺陷对运动裂纹扩展过程的影响规律,采用动态焦散线实验方法进行模型实验,研究了冲击载荷下含空孔三点弯曲梁的动态断裂行为。研究结果表明:空孔对裂纹扩展有极大的阻碍作用,在一定范围内,空孔直径越大,阻碍作用越明显。裂纹扩展到空孔附近时,扩展速度会下降。裂纹在空孔上部再次起裂后,最大扩展速度远远大于裂纹与空孔贯通前的最大扩展速度。裂纹扩展至空孔附近时,裂纹尖端动态应力强度因子Kd和Kd均会下降。裂纹在空孔上部再次起裂后,裂尖的应力强度因子Kd和Kd均大于裂纹与空孔贯通前裂尖的Kd和Kd。在整个扩展过程中,裂纹尖端的动态应力强度因子Kd远小于Kd,说明Kd在裂纹扩展过程中起主要作用。
英文摘要:
      In order to understand the influence pattern of circular hole defect on crack propagation process, by using dynamic caustics method, a model experiment was carried out to study the dynamic fracture behavior of three-point bending beam with empty hole. Experimental results indicate that empty hole has a significant impediment effect on crack propagation. In a certain range, the larger the empty hole diameter is, the more obvious the impediment. When a crack extends to the vicinity of an empty hole, its propagation rate decreases. When the crack appears again in the upper part of the empty hole, its maximum expansion velocity is much larger than that before the crack and the empty hole coalescence. When a crack extends to the vicinity of an empty hole, both dynamic stress intensity factors at crack tip Kd and Kd decrease. When the crack appears again in the upper part of the empty hole, both dynamic stress intensity factors at crack tip Kd and Kd are larger than that before the crack and the empty hole coalescence. In whole crack propagation process, the dynamic stress intensity factor Kd is always less than Kd, which indicates that Kd plays a main role in crack propagation process.
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