某三缸发动机连杆有限元分析

Finite Element Analysis of a Three Cylinder Engine Connecting Rod

应用有限元分析软件abaqus对某三缸汽油机的连杆进行了静强度分析,通过有限元分析,可以得到连杆在最大爆发压力工况(压应力)和最大惯性力工况(拉应力)下的应力分布情况。从分析结果可知,在最大爆发压力工况(压应力)下,应力主要集中在连杆小头与连杆杆身的过渡圆角处,最大应力值为659 MPa;最大惯性力工况(拉应力)下,最大应力为489 MPa,最大应力出现在螺栓孔位置。在两种工况下,连杆最大应力均低于材料的屈服强度745 MPa,满足强度要求。应用fe-safe疲劳分析软件对连杆进行疲劳强度分析,得到了连杆的疲劳安全系数的云图分布情况,该三缸汽油机连杆疲劳安全系数均大于1,满足疲劳强度要求。

The finite element analysis software ABAQUS was used to analyze the static strength of the connecting rod of a three cylinder gasoline engine. The stress distribution of the connecting rod was obtained by the finite element analysis. From analysis of the results shows that, the maximum explosion pressure conditions （stress）, the stress mainly concentrated in the small head of the connecting rod and connecting rod of the fillet, the maximum stress value for 659MPa; maximum inertia force conditions pull （stress）, the maximum stress for 489 MPa, maximum stress appears in the position of the bolt hole. In the two working conditions, the maximum stress of the connecting rod is lower than the yield strength of the material 745MPa, which satisfies the strength requirement. Using FE-SAFE fatigue analysis software to analyze the fatigue strength of the connecting rod, the distribution of the fatigue safety factor of the connecting rod is obtained. The fatigue safety factor of the connecting rod of the three cylinder gasoline engine is more than 1, which meets the requirements of fatigue strength.