应用ANSYS概率有限元法的连杆结构强度可靠性分析

Reliable analysis for structural intensity of connecting-rod based on FEM of ANSYS

柴油机连杆的工作条件十分复杂,为了保证其安全长寿命的使用,对其可靠性提出了较高的要求。考虑到实验室小样本的结构全尺寸试验的经济性,用基于ANSYS软件的结构可靠性模块,将FEM(F in ite E lem entM ethod)与Monte-Carlo法结合起来,通过APDL参数化建模,分析输出文件,得出不确定设计因素与目标变量的灵敏度关系,同时给出最大危险部位的最大应力与最大变形的概率分布函数及主要影响因素,为结构可靠性优化设计提供有用数据,减少试验时间,提高设计效率。

Because of complexity of using condition of diesel engines and to make use of safe and long life, thus there is a high requirement for reliability. In view of economy of the experiment for whole structure of small samples in lab ,using the structural reli- ability module based on ANSYS. Getting relations of sensitive between uncertain design factors and object variable by APDL molding and output files, at the same time obtaining probability distributing function and main affecting factor, offer the useful evidences for reliable optimized design and reduce the experiment time to improve designed efficiency.