裂纹缺陷对结构动态断裂行为的影响效应研究
发布时间：2019-07-04 10:32
【摘要】：采用落锤冲击加载的方式,结合焦散线方法,研究了裂纹缺陷对有机玻璃(PMMA)板条试件动态断裂行为的影响效应。通过对试件断裂破坏过程的观测和分析,得到了裂纹尖端动态应力强度因子和裂纹扩展速度的变化规律。结果表明,该试验加载条件下,结构的断裂韧度约为1.00 MN/m~(3/2);裂纹缺陷的存在对运动裂纹扩展的总体效果是抑制的,含裂纹缺陷试件中运动裂纹的扩展时间约为不含裂纹缺陷的1.5倍;随着裂纹缺陷长度的增加,运动裂纹在缺陷处再次起裂更为困难。
[Abstract]:The effect of crack defects on the dynamic fracture behavior of plexiglass (PMMA) lath specimens was studied by means of drop hammer impact loading and caustic line method. Through the observation and analysis of the fracture failure process of the specimen, the dynamic stress intensity factor and the crack propagation velocity at the crack tip are obtained. The results show that the fracture toughness of the structure is about 1.00 MN/m~ (3 鈮，
本文编号：2509853
[Abstract]:The effect of crack defects on the dynamic fracture behavior of plexiglass (PMMA) lath specimens was studied by means of drop hammer impact loading and caustic line method. Through the observation and analysis of the fracture failure process of the specimen, the dynamic stress intensity factor and the crack propagation velocity at the crack tip are obtained. The results show that the fracture toughness of the structure is about 1.00 MN/m~ (3 鈮，
本文编号：2509853
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