Fatigue analysis of the entire process of connecting rod operation for a diesel engine
In order to solve the cylinder tampering fault of a certain diesel engine,the reason is determined through connecting rod force analysis,fatigue tests,and finite element simulation analysis.The analysis results show that the force on the connecting rod head perpendicular to the rod direction is mainly caused by the inertia force of the connecting rod itself.The fatigue test can only reflect the force situation of the connecting rod under the maximum tensile load and compressive load,and can not reflect the force situation of the connecting rod at other times.The fatigue safety factor at the tooth profile of the connecting rod positioning is the smallest,which is 1.05.It is determined that fatigue fracture occurs at the tooth profile of the connecting rod positioning,leading to cylinder tampering failure in the engine.The machining process of the connecting rod is improved by changing the tooth shape positioning to the expansion and fracture positioning,which solve the problem of low fatigue safety factor of the positioning tooth shape and does not result in engine cylinder tampering failure.
connecting rodfatigue testfatigue strength analysisfatigue fracturefinite element simulation
NETL
NSTL
万方数据
