In this work, an experimental study was carried to obtain the fatigue
accumulation damage for aluminum alloy, 2024-T4 under rotating bending loading
and stress ratio R= -1. The experiments were done at RT(room temperature) ,25oC
,and 200oC. A modified damage stress model was suggested to predict the fatigue
life under elevated temperature which has been formulated to take into account the
damage at different load levels. The present model results were compared with the
experimental results and those calculated by the most fatigue damage model used
in fatigue (Miners rule). The comparison showed that the present model presents
reasonable factor of safety while Miner model sometimes gave a factor of safety
close to unity.