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

作　　者：陈鑫 童小龙[1] 刘玉启 郭华泾 CHENXin;TONG Xiao-long;LIU Yu-qi;GUO Hua-jing(School of Civil and Construction Engineering,Hunan Institute of Science and Technology,Yueyang414006,Hunan,China;Central Plains Environment Protection Co.,Ltd,Zhengzhou450000,Henan,China)

机构地区：[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

出　　处：《机械研究与应用》2024年第1期23-25,31,共4页Mechanical Research & Application

基　　金：湖南省大学生研究性学习和创新性实验计划项目:一种面向钢结构疲劳裂纹扩展的多尺度数值模拟方法(编号:S202210543055);湖南省自然科学基金资助项目:边缘构件连接-竖向分布钢筋不连接的新型预制剪力墙抗震性能研究(编号:2023JJ50281)。

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。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 influence 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 

分 类 号：O346.1[理学—固体力学]