Non-linear thermoelastic analysis of thin-walled structures with cohesive-like interfaces relying on the solid shell concept

In this work, a thermodynamically consistent framework for coupled thermo-mechanical simulations for thin-walled structures with the presence of cohesive interfaces is proposed. Regarding the shell formulation, a solid shell parametrization scheme is adopted, which is equipped with the mixed Enhanced Assumed Strain (EAS) method to alleviate Poisson and volumetric locking pathologies. It is further combined with the Assumed Natural Strain (ANS) method leading to a locking-free thermo-mechanical solid shell element using a fully-integrated interpolation scheme. In order to model thermo-mechanical decohesion events in thin-walled structures with imperfect internal boundaries, an interface finite element for geometrical nonlinearities is herein extended to account for the thermal field and thermo-elastic coupling. The computational implementation of the current finite element formulation has been performed as a user element in ABAQUS via user-defined capabilities. The predictability of the model is demonstrated using several representative examples.