基于主S-N曲线的焊接结构振动疲劳的仿真分析  

Simulation Analysis of Vibration Fatigue of Welded Structure Based on Main S-N Curve

作　　者：刘德刚[1] 李亚波[2] 

机构地区：[1]南车青岛四方机车车辆股份有限公司技术中心,山东青岛266111 [2]南车青岛四方机车车辆股份有限公司国家工程实验室(南方),山东青岛266111

出　　处：《铁道车辆》2016年第1期1-3,11,共4页Rolling Stock

摘　　要：使用传统的名义应力法计算焊接结构的疲劳寿命存在焊接接头形式及名义应力难以确定的困难,此外对承受振动作用的结构进行疲劳分析时通常需在频域内进行疲劳计算,使得仿真结果与实际情况有较大出入。文章探索了一种新的针对焊接结构振动疲劳的计算方法:首先,将振动加速度功率谱(ASD)进行傅里叶逆变换,在时域内计算结构的动态响应,然后使用主S-N曲线法来计算结构的疲劳损伤。There is the difficulty to determine the forms of weld joints and nominal stress in calculation of fatigue life of welded structures with the traditional nominal stress method.Moreover,when the fatigue analysis is made on the structure withstanding vibration,the fatigue calculation usually should be made within the frequency domain,so that the simulation result is quite different from the actual conditions.In this paper,a new calculation method for vibration fatigue of welded structures is researched:First,make the inverse Fourier transform for the vibration acceleration power spectrum,calculate the dynamic response of the structure within the time domain,and then calculate the fatigue damage of the structure with the main S-N curve method.

关 键 词：焊接结构 振动 疲劳强度 仿真 主S—N曲线 

分 类 号：U270.32[机械工程—车辆工程]