An evaluatuation for threshold stress intensity factor range under a stress controlled condition, using effective threshold stress intensity factor range, was proposed. Threshold stress intensity factor range was evaluated by analyses of plasticity-induced crack closure for two types of crack size:a small crack and a long crack. Plasticity-induced crack closure was analyzed for two dimensional crack in plane stress. Besides, theoretical examinations were performed in order to explain the mechanism that the fatigue limit of high hardness steel decrease with a rise of hardness. Relationship between threshold stress intensity factor range and pre-crack length which was evaluated by analysis of plasticity-induced crack agreed with experimental results qualitatively. Dependency of yield stress was different between a small crack and a long crack. The threshold stress intensity factor range of a long crack decrease with a rise of yield stress. This result could be helpful to reveal the mechanism that the fatigue limit decrease with a rise of hardness in high hardness.
|Translated title of the contribution
|OS1003 Threshold Stress Intensity Factor Range Analysis Using Dugdale Model
|Published - 2013