WRINKLING BEHAVIOR OF RECTANGULAR-PLATES UNDER LATERAL CONSTRAINT

Wrinkling (buckling) during a sheet forming process is a major conside ration when designing part shape, die geometry and processing paramete rs. In most instances, the sheet metal is constrained to some extent b etween binders and/or matching dies at some stage during processing. I n this paper, we will examine the wrinkling behavior of both elastic a nd elastic-plastic sheet subjected to edge compression and lateral con straint. A criterion for wrinkling under such constraint is establishe d using a combination of finite element analysis and energy conservati on. Various methods of incorporating imperfections into a finite eleme nt model in order to capture buckling and post-buckling behavior are d iscussed. A simple and practical form of imperfection for predictive m odeling of buckling is given along with a discussion of the sensitivit y of the solution to the magnitude and distribution of imperfections. Using the proposed form of imperfection, we are able to accurately sim ulate the wrinkling behavior under complicated boundary conditions in a predictive manner. Copyright (C) 1996 Elsevier Science Ltd.