半椭圆表面裂纹应力强度因子公式的评估

摘要

The stress-intensity factor (SIF) of the semi-elliptical surface crack in the finite body under extensional stress is sclculated by using the FEM software ANSYS release 5.5. The correction factor Mf of SIF at different point along the front of the crack is determined.The relation between Mf and the semi-elliptical shape a lc, the relative crack depth a/b, the variation of angle θ, the relative crack width 2c/w and the relative height-width ratio h/w are calculated respectively. Finally the application range and the modification of the engineering formula about SIF is proposed.