FORMABILITIES OF STEEL ALUMINIUM ALLOY LAMINATED COMPOSITE SHEETS/

The tensile properties and press formabilities of laminates experiment ally produced from mild steel and various aluminium alloy sheets are e xamined. The tensile properties of the laminates are approximately pre dictable by the mixture rule of the properties of the individual sheet s. The forming limits in deep drawing, as well as stretch forming due to various types of fractures of the laminated composite sheets, canno t be predicted without considering the stress and strain histories of the individual sheets during forming. Furthermore, it is found that th e drawability, as well as the stretch formability, is improved by sett ing the mild steel sheet on the punch side for the case of aluminium a lloy sheet with comparatively high ductility, and by sandwiching the a luminium alloy sheet with the mild steel sheets for the case of low du ctility.