含裂纹缺陷的脆性材料冲击三点弯曲试验

发布时间：2018-04-13 14:17

本文选题：裂纹缺陷 + 冲击载荷　；参考：《中国矿业》2017年03期

【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。
[Abstract]:In order to study the dynamic fracture behavior of brittle materials with crack defects under dynamic impact loading.Using the digital laser dynamic caustic line experimental system and the self-designed drop hammer impact loading platform, the failure patterns and the failure process of PMMA samples with different crack defects were recorded under the impact of drop hammer.The variation trend of dynamic stress intensity factor and velocity during the process of moving crack propagation is analyzed.The results show that the crack defects in the specimen have a guiding effect on the propagation of the moving crack.The effects of crack defects with different dip angles on the propagation of moving cracks are also different, and the effects of inclined crack defects and horizontal crack defects on the propagation of moving cracks are obviously inhibited.
【作者单位】：中国矿业大学(北京)力学与建筑工程学院;
【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)
【分类号】：O346.1

【相似文献】