The effect of core density and thickness on the ballistic impact performance of GRP/Polyurethane Foam/GRP sandwich structures (TM-PDU-086)

British Rail use glass fibre reinforced plastic (GRP)/rigid polyurethane (PU) foam/GRP sandwich structures for High Speed Train (HST) locomotive cabs and multiple unit forward facing doors. It had always been assumed that the foam core played a very minor part in the ballistic impact resistance of these structures, but there...