Numerical simulation for deformation of multi-layer steel plates under underwater impulsive loading

To further understand the dynamic deformation and impact resistance of thin-plate hull structure under impulse wave, the deformation of multi-layer steel plates under underwater impulsive loading has been studied by AUTODYN V6.1. In order to verify the validity of numerical methods, the experimental results are compared with the simulation results. The multi-layer plate types include 1 mm+3 mm, 2 mm+2 mm, 3 mm+1 mm double-layer, and 4 mm monolayer annealed 304 stainless steel plates. Each type of target plates has four flyer plate's velocities. There are 150, 200, 250 m/s and 300 m/s. The pressure wave histories in water and deformation of specimens have been predicted and measured by numerical simulations. The simulation results demonstrate that the protective capacity of 2 mm+2 mm double-layer annealed 304 stainless steel plates is the best one in this velocity range of flyer plate, as the integral deformation is the smallest among the four structure types.