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An accurate plasticity model of texture, strain-path induced anisot ropy and forming limits for computer aided sheet metal forming

Objective



Objectives and content
The objective of this basic research project is to
develop a constitutive model of the plastic behaviour of
metal sheet, taking into account its most relevant
aspects for single and multi-stage stamping operations.
Existing advanced plasticity models of texture and
strain-path induced anisotropy will be further developed
into an original unified model which captures the
influences of the microscopic physical mechanisms that
govern the macroscopic plastic behaviour, i.e.
crystallographic textures and dislocation structures.
This constitutive model will also be used to develop
forming limit criteria for reliable predictions of
possible sheet necking failures during multi-stage
forming. The resulting models will be of vital
importance for the development of accurate finite element
tools for virtual product development of all kinds of
sheet metal parts in, e.g. automotive, canning,
aerospace, and "white-ware" industries.
Sheets of different types and qualities will be selected
from the commercial production of steel and aluminium
sheet companies. Detailed experimental studies will be
carried out to fully characterise their crystallographic
textures, hardening behaviour upon strain-path changes
and forming limits after complex strain paths. A unified
model of texture and strain-path induced anisotropy will
be developed and extended for strain-rate sensitivity. A
complete experimental test procedure for the
determination of the material parameters will be defined.
Forming limit criteria for the prediction of necking
failure during complex strain-paths will be developed
based on the unified constitutive model. For validation
purposes, the constitutive and forming limit models will
be integrated into existing finite element codes for the
simulation of sheet metal forming. Both a simple test
case for basic verification and two complexes multistage
forming operations for industrial verification will be
defined performed and simulated. In-plane and thickness
strain distributions, final textures and possible failure
will be experimentally assessed and critically compared
to the FE predictions. The performance of the developed
models and software tools will be evaluated, and the
necessary remaining steps for industrial exploitation by
both sheet producing and forming industries will be
identified.

Coordinator

KATHOLIEKE UNIVERSITEIT LEUVEN
Address
2,Kasteelpartk Arenberg, 44
3001 Heverlee
Belgium

Participants (7)

BMW Bayerische Motoren Werke AG
Germany
Address
147,Knorrstrasse
80788 München
Centre National de la Recherche Scientifique
France
Address
Avenue Jean-baptiste Clément
93430 Villetaneuse
ENGINEERING SYSTEM INTERNATIONAL SA
France
Address
Rue Saarinen 20, Silic 270
94578 Rungis
HOOGOVENS CORPORATE SERVICES BV
Netherlands
Address
Wenkebachstraat 1
1951 JZ Velsen Noord
OCAS - ONDERZOEKSCENTRUM VOOR AANWENDING VAN STAAL N.V.
Belgium
Address
3,John Kennedylaan 3
9060 Zelzate
REGIENOV - RENAULT RECHERCHE ET INNOVATION
France
Address
9,Avenue Du Golf 1
78288 Guyancourt
UNIVERSITY OF PORTO
Portugal
Address
Rua Dr. Roberto Frias
4200-465 Porto