Damage mechanics based probabilistic high-cycle fatigue life prediction for Al 2024-T3 using non-intrusive polynomial chaos

摘要

This paper proposes a low-cost method for predicting probabilistic high-cycle fatigue life for Al 2024-T3 based on continuum damage mechanics and non-intrusive polynomial chaos (NIPC). To randomize Lemaitre's two scale fatigue damage model, parameters S and s are regarded as random variables. Based on small sample of test life, inverse analysis is performed to obtain samples of the two parameters. Statistic characteristics of the two parameters are calculated analytically through coefficients of NIPC. Fatigue test of aluminum alloy 2024-T3 standard coupon and plate with hole under different spectrum loading shows that the proposed method is effective.