단독표면균열재의 피로수명 예측 해석 = Analysis on the Fatigue Life Prediction of a Single Surface Cracked Body

다국어 초록 (Multilingual Abstract)

Recent studies have shown that the fatigue growth behavior of semi-elliptical surface crack cannot be adequately predicted solely by the stress intensity factor analysis. The variation in constraint along the crack border, from plane stress condition at the plate surface to plane strain condition at the point of maximum crack depth, must be an important factor affecting the fatigue crack growth behavior.
In this paper, an analysis on the fatigue life prediction of a semi-elliptical surface cracked body was performed, accounting for the variation in constraint along the crack border. That is, the fatigue life for a surface cracked body was predicted using linear elastic fracture mechanics concepts that were modified to account for crack closure behavior. The model for the fatigue life prediction in consideration of crack closure phenomenon was developed, and then the predicted fatigue lives using the model were compared with test data from PMMA specimens. The predicted results appeared to be conservative.