Cyclic plasticity model for fatigue with softening behaviour below macroscopic yielding

摘要: Abstract Experimental observations have evidenced the insufficiency of yield surface definition via monotonic loading to guarantee adequate description material behaviour under fatigue tests. Therefore, mechanical property characterisation through simple experimental tests such as uniaxial extension/compression is favoured, considering different responses due cyclic loading. Herein, a phenomenological plasticity model formulated capture correct generation plastic deformation conditions, even for stress states lower than stress. The unconventional extended subloading modified include an additional internal variable describing strain-softening phenomenon typical low- high-cycle problems. Implicit integration strategies, in form cutting-plane and closest projection point return mapping algorithms, are implemented reduce computation time. solution accuracies compared that forward Euler scheme, exhibit fast accurate performance.