A Research on the Fatigue Property of Engine Cylinder Cap

The fatigue characteristics of casted engine cylinder by aluminum alloy has been analyzed by using staircase method.Fatigue strength limit and standard deviation have been determined under a certain reliability and validity.The research indicates that the S-N curve of the cylinder contains a section of straight line,which means it has a limit of fatigue strength.The result offers the foundation for further research on fatigue life of cylinder.