Fatigue Life Prediction at Elevated Temperature under Low – High and High – Low Loading Based OnMechanical Properties Damage Model
Engineering and Technology Journal,
2012, Volume 30, Issue 11, Pages 1886-1896
Abstract
In this work, an experimental study was carried to obtain the fatigueaccumulation 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.
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