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This study investigates the effect of foam density variations in sandwich structure under high velocity impact loadings. The structure consists of composite facing made from glass fiber woven roving reinforced unsaturated polyester resin and rigid polyurethane foam core with density of 37, 49, 70, 95, 105 and 240 kg/m 3 . Smooth bore gas gun in velocity range of 100–150 m/s and 10.7 g semi-spherical...