بررسی تأثیرات زیر بار در تأخیر ناشی از اضافه بار در انتشار ترک خستگی

This study proposes to implement the underload effect in order to decrease the conservative results expected from this model. Decoopman’s model proposes a delay weighting factor after an overload cycle. In order to take into account of an underload cycle, we suggest an acceleration coefficient to correct the model. The main advantage of this model is that the delay weighting factor and the acceleration coefficient are only dependent on yield stress σY, the crack length a, and the various plastic zone sizes. Many experimental results have been compared to simulated results. These comparisons show a good agreement.