应用多体有限元混合法对复杂结构疲劳寿命仿真  

RESEARCH OF FATIGUE LIFE SIMULATIONS APPLIED TO COMPLEX STRUCTURE BY MBS-FEM

作　　者：缪炳荣[1] 肖守讷[1] 张卫华[1] 金鼎昌[1] 阳光武[1] 

机构地区：[1]西南交通大学牵引动力国家重点实验室机车车辆研究所,成都610031

出　　处：《机械强度》2008年第1期137-143,共7页Journal of Mechanical Strength

基　　金：国家自然科学基金(50323003);教育部创新团队研究计划(IRT0452)资助项目~~

摘　　要：利用多体—有限元混合法对复杂结构进行有效的疲劳寿命预测。该法用于处理随机动载荷作用下转向架构架的疲劳设计。作用在大型结构上的时变边界条件和动载荷历程可以通过应用多体系统分析软件SIMPACK的多体仿真技术获得。在ANSYS中利用有限元准静态应力/应变分析技术产生结构应力发生的危险区域。模态分析技术用来获得结构固有频率和模态振型。基于危险应力分布、动载荷时间历程以及Palmigren-Miner损伤理论,最后利用FE-FATIGUE软件的安全强度因子分析法进行标准时域的结构疲劳寿命预测,其中包括应力应变的循环计数、损伤预测和最终寿命估计。The objective of the current research is to find the most efficient approach to predict large complex structure fatigue life with multi-body system （MBS） and finite element method （FEM）. The method is implemented to handle with the difficulties of a railway bogie fatigue design under random dynamic loads. The time varying boundary conditions and dynamic load histories acting on the large structure can be evaluated by applying the Multi-body System analysis technique in software SIMPACK. FEM quasi-static stress/strain analysis technology with software ANSYS yields the danger stresses in the critical locations of the structure depending on the unite loads. And modal analysis is used to determine frequencies and mode shapes of structure. Based on these danger stresses distribution and dynamic load time histories, fatigue life can be estimated with Palmigren-Miner theory. The standard time histories method involves stress or strain cycle counting, damage prediction, and finally life estimation in software FE-FATIGUE with factor of safety technology.

关 键 词：多体系统 有限元法 疲劳寿命 动应力 

分 类 号：U268.3[机械工程—车辆工程] U260.331[交通运输工程—载运工具运用工程]