Numerical and Analytical Investigation of Forming Limit Diagram of SS316L foil

Abstract: In process of sheet metal forming, forming limit is characterised by the start of cracking, wrinkling, necking and it is crucial to know the limit up to which the sheet metal can be formed. Forming limit diagram (FLD) gives a brief idea about major and minor strains along with forming limit curves. The mainly three ways for plotting of FLD as given analytical, numerical, and experimental. The research work presents micro-forming investigations on an stainless steel sheet of 50 microns, to plot FLD, using the limit dome height test in accordance with to ASTM E2218-02 standard. Forming limit diagram (FLD) offers a suitable and useful tool to predict the forming behaviour of the sheet metals. This paper is concentrated on the plotting of FLD for stainless steel(SS-316L). Numerical and analytical approach are used to develop forming limit diagram of ultra thin SS316L metal foil. Keywords: Sheet metal, Micro forming, Forming Limit Diagram, Analytical, Numerical