Blast response of bioinspired nacre-like staggered composite plates combined with steel and polyurea

Abstract

Inspired by the mother-of-pearl layered structure, a multilayered staggered composite plate (SCP) consisting of steel and polyurea was designed, and its dynamic responses under high impulse loads were investigated. The precision of the numerical model design and parameter selection was first validated by the blast experiment results of a normal composite plate (NCP). The center point displacement, velocity, and acceleration of the NCP and SCP were compared, and the corresponding values for the SCP decreased by 38.43%, 5.77%, and 63.30%, respectively. The backplate overpressure and intra-plate stress of the SCP were reduced by 86.67% and 81.48%, respectively. The SCP greatly improved the energy absorption efficiency through the phenomena of interlocking, friction, and slippage between layers. As the delamination number of the SCP increased, both the displacement, velocity, and acceleration of the center point and the energy absorption efficiency increased. When the polyurea layer thickness ratio and the steel table thickness ratio were 0.1675 and 0.125, respectively, the deformation response and energy absorption efficiency of the SCP tended to be similar. Finally, the effective modulus of elasticity of the SCP was analyzed based on a shear-lag model.