低碳钢Q345多尺度疲劳断裂行为研究
Analysis on the Multi-Scale Fatigue Fracture Behavior of Low-Carbon Steel Q345
陈鑫 1童小龙 1刘玉启 2郭华泾1
作者信息
- 1. 湖南理工学院 土木建筑工程学院,湖南 岳阳 414006
- 2. 中原环保股份有限公司,河南 郑州 450000
- 折叠
摘要
为了解决钢结构疲劳断裂问题,该文基于应力等效原理引入了材料内部微、细观缺陷的影响,利用有限元软件ABAQUS模拟了含损伤的低碳钢Q345 多尺度疲劳裂纹扩展过程,研究了裂纹尖端场分布及其疲劳断裂行为.研究表明,材料内部微、细观缺陷引起的损伤对宏观裂纹尖端塑性区分布、尖端应力强度因子和J积分均具有较大影响,裂纹达到一定长度后,影响更为显著,且会较为明显地加速宏观裂纹扩展.
Abstract
In order to resolve the fatigue fracture problem of the steel structure,the multi-scale fatigue crack propagation process of the damaged low-carbon steel Q345 is simulated by using the finite element software ABAQUS in which the influ-ence of the micro and meso defects of materials has been considered based on the principle of stress equivalence.The results illustrate that the damage caused by micro and meso defects of materials shows great influence on the distribution of the plastic area,the stress intensity factor and J-integral along the macro-crack tip;especially for the macro-crack with enough length,it would significantly accelerate the propagation of the macro-crack.
关键词
疲劳断裂/损伤/塑性区/J积分/裂纹扩展Key words
fatigue fracture/damage/plastic area/J-integral/crack propagation引用本文复制引用
基金项目
湖南省大学生研究性学习和创新性实验计划项目(S202210543055)
湖南省自然科学基金资助项目(2023JJ50281)
出版年
2024
NETL
NSTL
万方数据