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采用传统静力分析方法和接触有限元分析方法,分别以连杆整体模型及复杂装配体模型作为计算模型,校核了某型柴油机连杆组件的疲劳强度,并对两种算法作了对比分析。结果表明,两种计算方法具有同等的可信度,但接触算法可以分析连杆各部件间的接触应力。最后设计并完成连杆静力电测拉伸和压缩应力应变试验,连杆应力随着载荷的增加呈线性增加,小应力区域,计算值稍大,但主应力区域的模拟计算值都比较准确,整体应力计算值与试验值较吻合。因此,验证了两种有限元算法对连杆组件进行强度分析的有效性和可靠性。
By using the traditional static analysis method and the contact finite element analysis method, the overall connecting rod model and the complicated assembly model are respectively used as the calculation models to check the fatigue strength of a connecting rod assembly of a diesel engine and to compare the two algorithms . The results show that the two methods have the same reliability, but the contact algorithm can analyze the contact stress between the link components. Finally, the tensile test and the compressive stress-strain test of the connecting rod static electricity are finished. The stress of the connecting rod increases linearly with the increase of the load. In the small stress region, the calculated value is slightly larger, but the simulated values of the main stress region are more accurate , The calculated value of the overall stress is in good agreement with the experimental value. Therefore, the validity and reliability of two finite element algorithms for strength analysis of connecting rod assembly are verified.