Efecto del cambio en el camino de deformación en la formabilidad de chapas de acero DP-780 y zinc Zn20

ABSTRACT The Forming Limit Diagram (FLD), frequently used to characterize the formability of sheet metals, is determined by assuming proportional loading histories up to the onset of necking. However, the limit strains are highly affected by strain-paths changes, which are very usual in real metal forming processes. The aim of this work is to analyze the effect of the loading history on the FLDs of a 0,9 mm thick DP-780 steel sheet and a 0,65 mm thick Zn20 zinc sheet by applying two-stage tests. The forming limits are studied under uniaxial deformation for the biaxially pre-deformed materials....