冲击荷载下运动裂纹与空孔相互作用的焦散线试验研究  

Caustics experimental study on the interaction between moving cracks and voids under impact loading

作　　者：骆浩浩 张渊通 左进京 李成孝 李炜煜 Luo Haohao;Zhang Yuantong;Zuo Jinjing;Li Chengxiao;Li Weiyu(School of Mechanics and Civil Engineering,China University of Mining and Technology-Beijing,Beijing 100083,China;School of Civil and Resource Engineering,University of Science and Technology Beijing,Beijing 100083,China;School of Safety Science and Engineering,Anhui University of Science and Technology,Huainan Anhui 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]北京科技大学土木与资源工程学院,北京100083 [3]安徽理工大学安全科学与工程学院,安徽淮南232001

出　　处：《矿业科学学报》2022年第2期210-216,共7页Journal of Mining Science and Technology

基　　金：国家自然科学基金(51934001)。

摘　　要：为了研究含有圆形缺陷的半圆盘试件在不同冲击速度下的断裂特征,采用霍普金森杆加载系统和动态焦散线试验系统,对半圆盘试件进行了试验研究。结果表明:裂纹起裂前,焦散斑半径出现跳跃情况,是入射杆的反复加载造成的;随着冲击速度的增加,裂纹穿过圆形缺陷的应力强度因子峰值有所增加,裂纹穿过圆形缺陷的扩展速度也增加明显;随着圆形缺陷半径的增大,裂纹在圆形缺陷处发生二次起裂时的应力强度因子变大。In order to study the fracture characteristics of semi-disc specimens with circular defects under different impact speeds,Hopkinson rod is used to dynamically load the semi-disc specimen,and the fracture process of the semi-disc specimen is observed by the dynamic caustics test system,Through the combination of the two test systems,the fracture characteristics of the semi-disc specimens are studied,the research results show that:before the crack initiation,the focal speckle radius jumps,which is caused by the repeated loading of the incident rod.With the increase of the impact velocity,the peak stress intensity factor of the crack passing through the circular defect increases,and the propagation speed of the crack passing through the circular defect also increases significantly,which shows that the impact velocity contributes to the crack propagation.With the increase of the radius of the circular defect,the stress intensity factor of the second crack initiation at the circular defect becomes larger.

关 键 词：半圆盘 焦散线 裂纹扩展速度 应力强度因子 SHPB 

分 类 号：TU45[建筑科学—岩土工程]