SCALE MODEL TESTS OF A MULTI-LAYERED ABSORBING SYSTEM WITH DIFFERENT MECHANICAL PROPERTIES OF EXPANDED MATERIAL

Abstract

 In this study, to examine the effect of the mechanical properties of the expanded material on the performance of the multi-layered absorbing system, a scaled model of the absorbing system composed of sand, RC plate, and expanded material was designed and manufactured. Weight drop impact tests were performed by changing the type of expanded material, layer configuration, and input energy due to impact loading. The results showed that the larger the compressive strength of the expanded material, the larger the weight impact force and transmitted impact force, and the smaller the weight penetration and the degree of damage to the expanded material. Also, the shear stress acting on the RC plate increases as the compressive strength of the expanded material increases, and the tendency of punching shearing of the RC plate appears more strongly. It has been found that it has twice as much energy absorption performance as the input energy in design.