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Material characterisation for reliable and efficient springback prediction in sheet metal forming

 
: Krasowsky, A.; Schmitt, W.; Riedel, H.

:
Preprint urn:nbn:de:0011-n-491189 (584 KByte PDF)
MD5 Fingerprint: add42fff1f964a00105aee4f0f62eddd
Created on: 10.4.2009


Steel research international 77 (2006), No.9-10, pp.747-759
ISSN: 1611-3683
ISSN: 0177-4832
English
Journal Article, Electronic Publication
Fraunhofer IWM ()
springback; tension-compression test; Bauschinger effect; anisotropy; yield surface; texture

Abstract
In this paper, a novel experimental-numerical methodology for an accurate prediction of springback after sheet forming is presented. An advanced phenomenological material models is implemented in the FE-code ABAQUS. It includes the Bauschinger effect, the apparent reduction of the elasticity modulus at load reversal after plastic deformation, the strain rate dependency and the elastic-plastic anisotropy and its evolution during the forming process. The required material parameters are determined from stress-strain curves measured in tension-compression tests. These tests are carried out with a special test rig designed to avoid buckling of the specimen during compression. The benefits of this procedure for springback prediction are demonstrated. Additionally, parameters for the phenomenological models are determined from texture simulations.

: http://publica.fraunhofer.de/documents/N-49118.html