Experimental, theoretical and numerical investigation of springback behavior of Al/composite/Al sandwich sheet

Abstract

Springback is one of the most important defects which occur in sheet metal forming processes specially bending process. Springback occurs because of an elastic behavior during unloading process and leads to variation of bending angle from intended angle. In order to increase geometrical accuracy of formed parts, bending parameters should be chosen properly to compensate the springback effect on the arbitrary geometry. In the present study, the springback behavior of Al2024/Polyurethane-glass reinforced/Al2024 sandwich sheet has been investigated by using experimental, finite element and theoretical procedures. The results show that presented theoretical and finite element procedures can be used to predict amount of springback in sandwich sheets. Also results show that the amount of springback in sandwich sheets decreased by increasing process temperature and core thickness of sandwich sheets.