The experiments on notched specimens of an Aluminium alloy indicat that the notch fatigue life can be increased by a tensile over-pre loading but decreased by a compressive over-pre loading.

The calculation and measuremental results of K_f and △σ_(RN) (notch fatigue limit) are coincided very well,whose error is less than 10%.

The results show that, due to the superior high temperature ductility, K40S alloy exhibits low fatigue notch sensibility, 0.

A new calculation formula of fatigue notch factor of structural steel is presented.

In this paper the definition and the primary influence of fatigue notch factor are discussed,and some expressions of fatigue notch factor which are recently and commonly used are briefly reviewed.

According to the environment characteristics and corrosion depth distribution law of the naval aircraft structures fatigue notch factor ( K f ) and fatigue life mathematical model was built by using the Stress Field Intensity (SFI) and Local Stress strain methods.

The fatigue notch sensitivity calculated with the smooth fatigue limit,which depends mainly on the property of specimen core,and the notch fatigue limit,which depends mainly on the property of nitriding layer,is so small that it is unreal.

Microstructures and notch fatigue strength of X20CrMoV12.1 steels;