Analytical Model of Sandwich Panels' Response to Highly Localized and Dynamic Loads

Abstract

Sandwich structures are widely used in lightweight engineering applications due to their high stiffness-to-weight ratio and good energy absorption capabilities. However, their behavior under highly localized and dynamic loads remains complex to model accurately. This thesis investigates the transient response of circular sandwich panels subjected to high-dynamic pressure waves. An analytical model based on classical plate theory and modal superposition was developed to predict the displacement evolution of the panel. An analytical method to predict delamination onset through an energy-based criterion was developed as well. The results were validated through comparison with experimental data. The comparison shows good agreement in terms of the overall de- flection shape and magnitude. The proposed model captures the essential physics with minimal computational cost and offers a foundation for design optimization of dynamic load-resistant sandwich components. Future developments may focus on incorporating progressive damage models, as well as higher-order plate theories to enhance the predictive capability of the present model.