发动机连杆在恒定振幅载荷下的应力疲劳分析

摘要

针对发动机连杆的应力疲劳(高周疲劳)形式,主要分析了其在恒定振幅载荷下的应力疲劳,运用ANSYS15.0有限元分析建立了三维有限元模型,并对其进行了定性和定量的评定,得到了发动机连杆在恒定载荷下的应力、应变云图以及安全系数,交替等效应力,疲劳敏感度曲线图等,为发动机连杆的优化设计提供了数据参考.%According to the stress fatigue (high cycle fatigue) characteristics of engine connecting rod,this paper analyzes the stress fatigue under constant amplitude loading,establishes a three-dimensional finite element model with ANSYS15.0,and makes qualitative and quantitative assessment to obtain stress-strain contours,as well as the safety factor,altemate equivalent stress,fatigue sensitivity graphs,etc.under the constant stress load of the engine rod,and the data reference is provided for the optimal design of the engine connecting rod.