The basic thought of partial stress method of simulated sample design,which was put forward in this paper,enriched the designing theory of simulated sample.

As we know, it is very hard to get an accepted accuracy in high cycle fatigue life prediction by the local stress strain method.

This paper introduces the method and steps of the local stress strain method to analyze the fatigue with the application of ANSYS,uses this method to analyze and calculate the fatigue-life of the press-sensor shaft both before the optimization and after the optimization to give the basis of the judgement of how the optimization influences the fatigue damage of the shaft.

Based on the local stress-strain methodof notched component with even property and line elastic fracture mechanics method,and bytaking into account the variabilities due to welding such as geometrical shapes, residualstresses and material properties etc.

The life prediction methods of notched specimen are reviewed,especially on nominal stress approach,local stress-strain method and stress field intensity approach.

The blade fatigue damage during start-up is computed by means of local stress-strain method.

The fatigue life is obtained by using specimens without crack and by a special analysis based on local stress-strain method in which remembrance characteristics are considered.

Local stress-strain method was applied to determine fatigue crack initiation life of engineering structure or components.