Viscoplastic response of a circular plate to an underwater explosion shock

摘要

Viscoplastic response of a fully-clamped circular plate to an underwater explosion shock is studied in this paper. Strain-rate effect is included in the response. A fluid-structure interaction model is introduced, which is characterized by two stages: In the early stage, only the shock wave in water is considered, and the motion of structure is neglected. In the second stage, the wave propagation in structure and fluid is disregarded, and only long-term fluid force (added mass) and long-term structural force (membrane stress) are considered. Based on this model, the equation of motion of a fully-clamped circular plate is established, the solutions of which are compared with two experiments. The calculated maximum plastic deformations from present model are close to the observed values. The dependence of maximum plastic deformation on charge weight, plate radius and material property is also discussed.