FORMING AND FAILURE BEHAVIOR OF COATED, LAMINATED AND SANDWICHED SHEET METALS - A REVIEW

The subject of improving the formability and fracture resistance of co ated and laminated sheets, and sandwiches during forming and in servic e has received significant attention because these properties constitu te an important design criterion for these composite materials. This p aper reviews the mechanical and functional properties of these composi te materials. A special emphasis is placed on the study of their formi ng and failure behaviour. Major failure mechanisms are identified in t he laminated sheets during forming and in sandwiched sheets when subje cted to static and dynamic loading. Shape futability of coated and lam inated sheets after forming are also discussed in terms of the surface friction and shear deformation in the core layer. Conclusions and gen eralisations which can be drawn from the literature and from the autho rs' previous experience are presented, with discussions of areas in wh ich further research is required.