The Forming Limit Diagram of a Brass Sheet

Abstract

The forming limit diagrams of proportionally pre-strained brass sheets are experimentally determined for a combination of uniaxial and equi-biaxial tension. From these FLDs and the theoretical ones which are predicted by the use of a new plastic constitutive equation previously proposed by one of the authors (Gotoh) and a local necking condition, the most suitable hardening law of a brass sheet is investigated for n-th power hardening, VOCE and modified VOCE hardening laws. Furthermore, the dependence of the FLDs of a brass sheet on sheet thickness is discussed.