摘要
为研究冲击动态载荷作用下,含裂纹缺陷的脆性材料动态断裂行为。采用数字激光动态焦散线实验系统和自主设计的落锤冲击加载平台,记录了含不同裂纹缺陷的有机玻璃(PMMA)试件在落锤冲击作用下的破坏形态和破坏过程,分析了运动裂纹扩展过程中的动态应力强度因子和速度的变化趋势。结果表明:试件中的裂纹缺陷对运动裂纹的扩展具有导向作用。不同倾角的裂纹缺陷对运动裂纹扩展的作用效应也不相同;其中,倾斜裂纹缺陷和水平裂纹缺陷对运动裂纹的扩展具有明显的抑制效应。
In order to study on dynamic fractural behavior of brittle material with crack defect under impact loading, the test system of digital laser dynamic caustics and the self-designed drop-hammer impact testing platform are used, failure modes and damage procedures of PMMA specimens with different crack defects under impact loading are recorded, dynamic stress intensity factor and velocity of running cracks during propagating are analyzed. The results show that crack defects have guiding effects on propagations of running cracks. The influences of crack defects on running cracks are different for various inclination angles. Thereinto, oblique crack defect and horizontal crack defect have apparent inhibiting effects on the propagations of running cracks.
作者
丁晨曦
许鹏
王学东
马佳辉
DING Chenxi XU Peng WANG Xuedong MA Jiahui(School of Mechanics and Civil Engineering, China University of Mining and Technology （Beijing）, Beijing 100083, China)
出处
《中国矿业》
北大核心
2017年第3期122-125,131,共5页
China Mining Magazine
基金
国家重点研发计划项目资助(编号:2016YFC0600903)
国家自然科学基金项目资助(编号:51404273)
高等学校学科创新引智计划项目资助(编号:B14006)
关键词
裂纹缺陷
冲击载荷
动态应力强度因子
导向作用
crack defect
impact loading
dynamic stress intensity factor
guiding rule
