Gradient enhanced multi-scale modeling framework for glass fiber reinforced polyamides

This study proposes a multi-scale gradient enhanced nonlocal modeling framework aimed at predicting the mechanical response of long glass fiber reinforced polyamide composites that exhibit nonlinear viscoelastic viscoplastic rheology with ductile damage driven by plasticity. To treat numerically material instabilities severe levels, an internal length scale is introduced within model through controls non-physical localization state variables and consequent early failures. do so, phenomenological adopted to capture matrix phase microscale, then appropriate homogenization approach provide overall composite, in which imposed macroscale. As result, consistent capable capturing phenomena implemented commercial finite element software, addresses responses local exhibits higher stability.