Resumen en Inglés:

Abstract The design optimization of Annular Shaped Charge (ASC) is highly complex and nonlinear. Traditional ASC optimization focuses on liner structure using empirical methods, while optimization for annular charges is scarce because slight charge variations significantly alter the annular penetrator morphology. To address this, we propose a predictive model for Optimal Charge Compensation Amount (OCCA) of Hollow Annular Shaped Charge (HASC) by integrating Finite Element Method with Multilayer Perceptron (FEM-MLP). Through dimensional analysis and theoretical calculations, we identified four input parameters. Using these, 1431 data points were generated to train and test the MLP. Compared with SVR, Random Forest, and Linear Regression using 5-fold cross-validation, the MLP showed superior prediction accuracy and generalization. The trained MLP predicted OCCA for random and experimental structures, and numerical simulations confirmed high accuracy and generalization. The charge compensation method is broadly applicable for similar HASC structures. The optimized annular jet exhibits no deviation and delayed fracture, providing insights for annular jet penetration into targets.

Resumen en Inglés:

Abstract This study presents a nonlinear dynamic analysis of functionally graded half-cylinder sandwich (FGhCS) shells with elastic boundary conditions (EBCs) subjected to explosive loading (EL). An efficient finite element framework is developed based on a novel first-order shear deformation theory (n-FSDT) to account for both geometric and material nonlinearities. The governing equations are systematically derived from Hamilton’s principle, incorporating large deformation effects through von Kármán-type kinematics. The proposed model is validated against benchmark solutions, demonstrating high accuracy and improved computational efficiency. Parametric investigations are performed to assess the influences of geometric characteristics, material gradation, and boundary stiffness on the dynamic response. The results reveal that appropriate material distribution and elastic restraints can effectively mitigate the adverse effects of explosive loads, providing valuable insights for the optimal design of sandwich shell structures.