Combination of mean-field micromechanics and cycle jump technique for cyclic response of PA66/GF composites with viscoelastic–viscoplastic and damage mechanisms

An accelerated micromechanics framework based on the extended Mori–Tanaka transformation field analysis (TFA) and cycle jump technique is proposed to predict homogenized response of short glass fiber-reinforced polyamide 66 composites (PA66/GF) under a large number loading cycles (> 100,000 cycles). The theory accounts for microscopic viscoelastic–viscoplastic damage mechanisms, realistic microstructures induced by injection molding process. Toward this end, training are first conducted using TFA obtain global evolution functions material state-dependent variables (SDVs) each phase. These SDVs extrapolated linearly certain length with help such that direct numerical simulation during interval can be skipped, leading computational cost reduction. After jump, set complete performed re-establish functions. implementation procedure facilitated introducing an extrapolation control function allow adaptive size as well minimize extrapolating error. capabilities have been validated extensively vis-à-vis cycle-by-cycle benchmark calculations various conditions. It has further verified experimental results actual PA66/GF high-cycle beyond which simulations achieve.