韧性材料裂纹尖端钝化理论和仿真研究  

Theory and Simulation Investigation on Crack Tip Blunting for Ductile Material

作　　者：潘科琪[1] 张旭[1] 

机构地区：[1]上海核工程研究设计院,上海200233

出　　处：《核动力工程》2015年第5期128-131,共4页Nuclear Power Engineering

摘　　要：核电厂压力管道多采用高韧性材料。在外载荷作用下,高韧性材料裂纹尖端应力高度集中并产生塑性变形,使得裂纹尖端附近应力应变重新分布,引起裂纹尖端的钝化。基于弹塑性材料本构关系,采用1/4奇异单元离散裂纹前沿,在位移载荷控制下,仿真分析紧凑拉伸(CT)试样的钝化过程。在不同的位移加载下,研究CT试样钝化过程中硬化区大小以及断裂参数的变化规律。High ductile steel are usually adopted for the piping material. The stress concentration and the plastic deformation can be found at the crack tip for the ductile material under external load which make stress and strain of crack tip domain redistributed and the blunting deformation appeared. Based on the relationship of the elastic-plastic material, 1/4 singular elements are used for crack front discretization, under the displacements control, the blunting process are simulated. The hardening zone and the fracture parameter are studied at different loading rates.

关 键 词：韧性材料 裂纹 钝化 弹塑性 

分 类 号：O344.3[理学—固体力学]