Abstract
For automotive coatings that are a multi-layered polymer composite structure, the impact-induced failure brings harm to the appearance, corrosion resistance, and safety of a vehicle, and thus this topic has drawn wide attention. The involvement of large deformation poses a significant challenge to coating delamination modeling. Considering this, we propose a novel discontinuous Galerkin/cohesive zone model (DG/CZM) for large deformation delamination. The main advantages of our method are three-folded: (1) It allows stable and high-fidelity debonding simulations under large deformation; (2) The so-called artificial compliance issue is addressed by introducing a DG term; (3) A new algorithm is presented to accelerate the contact search procedure of the CZM, and it is of high efficiency and good robustness. Numerical examples are simulated to examine the competence of our model. This model is then applied to the impact failure of a single-layered polymer coating, through which the model's performance in large deformation scenarios is illustrated. Finally, with both polymer-ply and interlaminar failures considered, numerical studies on the effects of coating Young's modulus and post-yield behavior on the impact failure of the coating are thoroughly carried out. The numerical results and findings can provide guidance on coating design.
Published Version
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