An improved macro–micro-two-scale model to predict high-cycle fatigue life under variable amplitude loading

摘要: This study is based on continuum damage mechanics and constructs an improved macro–micro-two-scale model to predict the fatigue life of engineering metallic materials subjected variable amplitude loading. To account quantitatively for retarding effect higher load lower ones in a loading sequence, cyclic plastic response curve microscopic weak inclusion independently designed. Meanwhile, two-scale rate form proposed by introducing new exponent function acted equivalent strain term taking mean stress under The parameters are identified through inverse approach test results constant predictive accuracy validated data Al 2024-T3 standard coupon plate with hole different