AN EXPERIMENTAL STUDY OF THE FORMABILITY OF SHEET STEEL

G. CHARA RAMOS; M. STOUT; M.A. BERTINETTI; J.W. SIGNORELLI; R.E. BOLMARO; P.A.TURNER

Porto de Galinhas, PE, Brasil

Congreso; 18 Congresso Brasileiro de Engenharia e des Ciencia dos Materiais; 2008

A forming limit curve (FLC) is a tool frequently used in the sheet metal forming for stamping, drawing and stretching applications. Keeler and Backhofen and  Goodwin originally proposed the concept of the FLC as a line separating regions of safe and unsafe deformation. However, in reality, the FLC is much less precise and the experimental determination of it requires many individual measurements. In the present work performed on typical, drawing-quality, galvanized, steel sheet, we discuss the techniques used for the FLC measurement. Given this complete characterization of the sheet´s tensile, compressive and FLC properties, we discuss which measurements would provide sufficient data to calculate a FLC based on polycrystal plasticity and a Marciniak-Kuczynski instability model.