Coupling dynamic characteristics of high-speed water-entry projectile and ice sheet

Abstract

An ice sheet on the water surface will affect the water-entry process dynamic characteristics. Therefore, studying the process of high-speed projectiles passing through the ice sheet and entering the water is of great strategic significance. Based on the coupled Eulerian–Lagrangian (CEL) method, this study verifies the accuracy of the numerical solution for the high-speed water entry problem of projectiles. The elastoplastic constitutive model is used to simulate the mechanical behavior of the sea ice. The numerical results are compared with the experimental data to verify the applicability of the material model to the high-speed collision problem. Herein, the conditions of no ice and ice sheet thicknesses of 0.2, 0.6, and 1.0 m are considered. During the high-speed water entry process of projectiles, the evolution of the cavity is analyzed and compared with or without ice. Furthermore, the influence of the ice sheet on the axial load characteristics of the structure is presented. Simultaneously, general conclusions are afforded by observing the formation and propagation of cracks for the three ice sheets with varying thicknesses.