摘要
在裂纹扩展过程中,裂纹分叉行为使断裂变得更加难以预测。选择三种裂纹分叉模型为研究对象,采用嵌含有GTN损伤模型的有限元法,进一步针对拘束对裂纹扩展过程中分叉行为的影响进行研究。研究结果表明:拘束对裂纹分叉行为有很大的影响,与低拘束相比,高拘束下裂纹分叉现象更加明显。由机械性能和材料尺寸引起的强度失配与拘束之间的匹配是裂纹分叉的关键。当拘束引起的裂纹扩展趋势和强度失配引起的裂纹扩展趋势方向不同、大小相近且足够大时,裂纹发生分叉。
During the crack propagation process, the crack branching behavior makes fracture more unpredictable. In this work, three kinds of crack branching models were selected, and the FEM simulations based on GTN(Gurson-Tvergaard-Needleman) damage model were used to further investigate the influence of constraint on the crack branching behavior during crack propagation. The results show that the constraint has a great influence on crack branching behavior. Compared with low constraint, the crack branching phenomenon is more obvious under high constraint. The matching between strength mismatch induced by both the mechanical properties and dimensions of different regions and constraint is the key of crack branching. When the crack propagation trends induced by strength mismatch and constraint different in direction, similar in size and large enough, crack branching occurs.
作者
张旭东
王闻婕
杨杰
沈鋆
陈浩峰
ZHANG XuDong;WANG WenJie;YANG Jie;SHEN Jun;CHEN HaoFeng(School of Energy and Power Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China;Department of Mechanical&Aerospace Engineering,University of Strathclyde,Glasgow G11XJ,UK)
出处
《机械强度》
CAS
CSCD
北大核心
2022年第4期953-958,共6页
Journal of Mechanical Strength
基金
国家自然科学基金项目(51975378,52150710540)
上海市浦江人才计划(21PJD047)资助。
关键词
拘束
裂纹分叉行为
裂纹扩展路径
强度失配
Constraint
Crack branching behavior
Crack propagation path
Strength mismatch
