Study of Effects of Various Parameters on FLD Through Experiment and Software Simulation

Abstract

The use of sheet metal forming simulations has reduced lead-times and costs for thedevelopment of new forming Component signicantly. At present the industrial prac-tice demands a reliable determination of forming limits which assures the predictionof properly selecting the forming process in a digital environment.In industrial use ofthe FLDs a single basic FLD for a certain material can be used for all gauges. Thisis possible when it is realized that the eect of sheet thickness on the limit strains isapparent and forming behavior caused by the change in the thickness. Therefore, fac-tors aecting forming limit diagram should be analyzed for proper use of FLD leadingto optimization of material .For fracture prediction, forming limit diagram (FLD) isnow in widespread use to evaluate the feasibility of a stamped part. However, theystill present the major drawback of a test-intensive determination procedure. In par-ticular, experimental FLD needs to be determined for each thickness.The accuracy of the simulations is to a large extent dependent on the quality of thematerial properties provided as input to the simulations.This study is focused on theforming limit properties of AISI 1008 sheet metal. Dierent FLDs are compared byvarying the parameters using theoretical and empirical equations with experimentaland software results .In the present work, the factors aecting the limit strains arecritically discussed and the generally accepted dependence of the limit strains on thesheet thickness is shown to be the criterion of the limit strain.Finite Element Simu-lations of Limit Dome Height Test have been performed in order to nd the FLD. Inthe Experimental work, Limiting Dome Height Test and Erichsen test are performedfor nding the FLD.