Fatigue life prediction at elevated temperature under low-high and high-low loading based on mechanical properties damage model

Abstract EN

In this work, an experime ntal 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 tempe rature) ,25 o C ,and 200 o C.

A modified damage stress model was suggested to predict the fatigue life under elevated tempe rature which has be en formulated to take into account the damage at different load le vels.

The present model results were c ompare d with the experime ntal results and those calculated by the most fatigue damage model use d in fatigue (Miners rule ).

The comparison showed that the present model pre sents reasonable factor of safe ty while Mine r mode l sometimes gave a factor of safety close to unity .