Enhanced Exponential Fatigue Crack Growth Model for Al-alloy

In the present investigation, an attempt has been made to use “exponential model” in the prediction of fatigue life without integrating the fatigue crack growth rate curve (FCGR). The obtained results are compared with experimental crack growth data obtained for 2024-T351 aluminum alloy for four bending V-Charpy specimens under constant amplitude loading in stress ratio range from 0.1 to 0.3 and give good agreement. These results cover stages II and III of fatigue crack growth. It is observed that in the predicted results, mean values of percentage deviation and prediction ratio of the model are 4.24 and 0.945 respectively. The predicted results give good agreement with the literature.