THE DEFINITION OF INCIPIENT NECKING AND ITS IMPACT ON EXPERIMENTALLY OR THEORETICALLY DETERMINED FORMING LIMIT CURVES
Paper i proceeding, 2008

In the current paper various methods for Forming Limit Curve (FLC)evaluation are presented and discussed. The capabilities of modern optical systems for strain measurement are demonstrated. A method for limit strain evaluation, based on the onset of instability, is described in detail. The method can be applied for the evaluation of experimental strains, as well as of strains from Finite Element (FE) simulations. Three different approaches have been applied for the determination of FLCs for a DP600 steel. The method used for limit strain evaluation is shown to have a considerable influence on the level of the resulting FLC. Also results from FE-simulations of the same tests are presented. The importance of always questioning how a certain FLC has been evaluated is emphasized.

FLC

Sheet Metal Forming Simulation

Limit strain

FLD

Incipient Necking

Författare

Kjell Mattiasson

Chalmers, Tillämpad mekanik, Material- och beräkningsmekanik

Mats Larsson

Proceedings of IDDRG'08, The International Deep Drawing research Group, June 16-18, Olofström, Sweden, Edited by Nader Asnafi

Ämneskategorier

Annan materialteknik