文献类型：期刊文献

英文题名：Experimental Study on the Dynamic Behavior of Running Crack Affected by Defect Shape and Filling Material

作者：Lei, Zhen Zhao, Mingsheng

第一作者：雷振

通信作者：Lei, Z[1]

机构：[1]Guizhou Inst Technol, Inst Min Engn, Guiyang 550003, Guizhou, Peoples R China;[2]Poly Xinlian Blasting Engn Grp Co Ltd, Guiyang 550026, Guizhou, Peoples R China

第一机构：贵州理工学院矿业工程学院

通信机构：corresponding author), Guizhou Inst Technol, Inst Min Engn, Guiyang 550003, Guizhou, Peoples R China.|贵州理工学院矿业工程学院;贵州理工学院;

年份：2020

卷号：2020

外文期刊名：SHOCK AND VIBRATION

收录：;EI(收录号：20201508386187);Scopus(收录号：2-s2.0-85082726959);WOS:【SCI-EXPANDED(收录号:WOS:000522252800002)】；

基金：This research was supported by the National Natural Science Foundation of China (no. 51664007).

语种：英文

外文关键词：Crack propagation - Filling - Rubber - Silicone rubber - Silicones

摘要：Using the caustics method and the experimental system of digital laser dynamic caustics, the model experiment of drop hammer impact loading was carried out, and the effect of the defect shape (circular and rectangular) and the filling material (air, epoxy, and silicone rubber) on the propagation behavior of the running crack was investigated. The experimental results show that, under the impact loading, the running crack initiates at the end of precrack and propagates toward the defect. After the running crack connects to the defect, it accumulates energy within a certain period before initiating again at the upper edge of the defect. Subsequently, only one running crack is formed at the upper edge of the circular defect, but two running cracks are formed at the upper edge of the rectangular defect. The defect shape and the filling material have a significant effect not only on the energy accumulation time of the running crack at the defect but also on the stress intensity factor when initiating at the defect. The effect degree of the defect shape on the running crack propagation behavior is in the following order: circular defect > rectangular defect, whereas the effect degree of the filling material on the running crack propagation behavior follows this order: air > silicone rubber > epoxy.