Forming and failure behaviour of coated, laminated and sandwiched sheet metals: A review

The subject of improving the formability and fracture resistance of coated and laminated sheets, and sandwiches during forming and in service has received significant attention because these properties constitute an important design criterion for these composite materials. This paper reviews the mechanical and functional properties of these composite materials. A special emphasis is placed on the study of their forming and failure behaviour. Major failure mechanisms are identified in the laminated sheets during forming and in sandwiched sheets when subjected to static and dynamic loading. Shape futability of coated and laminated sheets after forming are also discussed in terms of the surface friction and shear deformation in the core layer. Conclusions and generalisations which can be drawn from the literature and from the authors' previous experience are presented, with discussions of areas in which further research is required.