An effective two -dimensional elastic -plastic finite element model has been set up to model the change of crack tip parameters under cycle loading. The non - linear finite element software

ABAQUS

has been used in this analysis. The calculated results of the crack tip parameters

such as stress

displacement and plastic zone size

have been compared with the results obtained by the Fracture Mechanics laws. The effects of the differ- ent element types on the crack tip parameters have been analyzed. It is found that the two -dimensional elastic - plastic finite element method is an effective model to solve the near crack tip stress concentration problem under cycle loading.