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Elastic-plastic constitutive model for accurate springback prediction in hot press sheet forming

Title
Elastic-plastic constitutive model for accurate springback prediction in hot press sheet forming
Authors
Lee, MGKim, SJ
POSTECH Authors
Kim, SJ
Date Issued
Jun-2012
Publisher
KIM
Abstract
The present study investigates the effect of phase transformation plasticity on the springback of hot press formed parts. Employing an implicit finite element formulation to take phase transformations during rapid cooling from fully austenitic phase and their related thermo-mechanical behavior into account, two validations - (1) the loaded dilatometry problem which induces significant plastic deformation even at lower stress levels than the classical yield stress, and (2) the 2-D draw bending problem, which introduces high temperature forming and subsequent quenching - are presented and compared with known experimental data. The study showed that the magnitude of springback predicted by considering the phase transformation plasticity and the temperature change induced volumetric strain agreed well with date from experiments, while the results determined with the conventional elastic-plasticity theory in which only plastic deformation by external load was used, had considerable deviation for the springback profile after hot press forming. The negligible springback amount after hot press forming, which has been frequently reported in many experimental observations, is due to the stress relaxation by the addition of abnormal transformation plasticity.
Keywords
ferrous metals; sheet metal; hot press forming; springback; FINITE-ELEMENT MODEL; MARTENSITIC-TRANSFORMATION; PHASE-TRANSFORMATIONS; MECHANICAL-PROPERTIES; DEFORMATION-BEHAVIOR; CYCLIC PLASTICITY; CARBON-STEEL; STRESS; MICROSTRUCTURE; ALLOY
URI
http://oasis.postech.ac.kr/handle/2014.oak/15989
DOI
10.1007/S12540-012-3007-1
ISSN
1598-9623
Article Type
Article
Citation
Metals and Materials International, vol. 18, no. 3, page. 425 - 432, 2012-06
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 KIM, SUNG JOON
Graduate Institute of Ferrous Technology
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