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.

在这项工作中，提出了一种热力学一致的框架，用于对存在粘性界面的薄壁结构进行热力学耦合模拟。关于壳公式，采用实体壳参数化方案，配备混合增强假设应变（EAS）方法来缓解泊松和体积锁定病理。它进一步与假定自然应变 (ANS) 方法相结合，使用完全集成的插值方案生成无锁定热机械实体壳单元。为了模拟具有不完美内部边界的薄壁结构中的热机械脱聚事件，本文扩展了几何非线性的界面有限元以解释热场和热弹性耦合。ABAQUS通过用户定义的能力。该模型的可预测性通过几个有代表性的例子来证明。