摘要
通过定义单个载荷循环所造成的疲劳损伤量,给出了一个适合于对疲劳过程进行模拟分析的非线性疲劳损伤累积模型.通过对多级载荷下的疲劳寿命分析结果与实验数据的比较,证明该损伤模型能够正确反映载荷次序效应等疲劳累积损伤规律.作为该模型的应用,本文采用计算机仿真方法进行了随机载荷作用下的起重机焊接箱形梁的疲劳寿命分析.
Proceeding from the definition of a damage variable of one load cycle,this pa- per presents a nonlinear accumulative damage model which is available for the simulated analysis of the fatigue process.It is proved that the new damage mod- el is able to correctly describe the loading order effect and other fatigue damage rules by comparing the analysis results with the experimental data of two kinds of steel materials subjected to multi-steP loadinds.As an application of the dam- age model,the fatigue life of the welded box girder of crane under random load- ing is predicted by an approach of computer simulation.
出处
《华东交通大学学报》
1995年第4期1-7,共7页
Journal of East China Jiaotong University
基金
铁路高校青年教师基金
关键词
疲劳
损伤
寿命
模拟
模型
Fatigue
Damage
Life prediction
Simulation
