| As one of the core components of internal combustion engine, the structure shape and load of connecting rod are complicated. The reliability and the working life of connecting rod affect the reliability and the working life of diesel engine. With the development of the internal combustion engine towards high power density, its requirement for the reliability of connecting rod is higher. With the development of software technology, the finite element software is widely used in the process of structural design and optimization.This thesis focuses on a real combustion engine connecting rod of a manufacturer, and analyzes its reliability using the finite element method. Firstly, the paper makes a force analysis of the connecting rod body, rod bolt, as well as the rod end cap. Then the thesis establishes a finite element model based on the actual working situation. Finally the thesis gives a linear and non-linear buckling analysis of the connecting rod to obtain the critical load value under maximum pressure condition when under inertial load and F-S relation curve.In order to assess the fatigue reliability, GOODMAN method is applied on the connecting rod fatigue performance analysis under different kinds of working condition. Some typical pre-tightening force values were selected for further analysis. The result shows that with the increase of the pre-tightening force of connecting rod bolts, the fatigue safety factor tends to decrease.Based on the requirement from the manufacturer, the thesis studies the effect of assembly error on the fatigue property of the connecting rod, and the effect of the unparalleled axes of big end and crankpin on the stress/strain field. Then the relationship between the angle of big end and crankpin and the fatigue life was given.According to the above analysis, the thesis provides reference idea on the manufacture control of the connecting rod, hopefully of some practical significance to manufacture companies. |
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