Numerical study on failure characteristics for polymeric plates under oblique impacting with an improved peridynamic model

To investigate the ricochet phenomenon and failure characteristics for PMMA (Polymethyl-methacrylate) plates subjected to oblique penetration, an improved peridynamic contact model is proposed in this study. The proposed model incorporates the dynamic friction coefficient and shank friction force, complemented by a hybrid contact search strategy that combines grid search and KD-tree methods to enhance computational efficiency. To validate the model and approach, numerical simulations for the oblique impact tests on PMMA are conducted, where the peridynamic results have a satisfactory agreement with the corresponding experimental data. The ricochet phenomenon is accurately reproduced in the peridynamic simulations, underscoring that the proposed model and approach have the capability to effectively capture the intricate failure characteristics in PMMA under oblique penetration. Additionally, a systematic analysis is performed to investigate the influence of critical parameters, including the incidence angle, initial velocity, and attack angle, on the overall oblique penetration performance. These findings highlight the robustness and practical applicability of the proposed model and approach in predicting and analyzing intricate failure responses in PMMA under dynamic loading conditions.