LS-DYNA Simulation of Hemispherical-punch Stamping Process Using an Efficient Algorithm for Continuum Damage Based Elastoplastic Constitutive Equation

An efficient integration algorithm for continuum damage based elastoplastic constitutive equations is implemented in LS-DYNA. The isotropic damage parameter is defined as the ratio of the damaged surface area over the total cross section area of the representative volume element. This parameter is i...

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Bibliographic Details
Published in:AIP conference proceedings 2005-08, Vol.778 (1)
Main Authors: Salajegheh, Nima, Abedrabbo, Nader, Pourboghrat, Farhang
Format: Article
Language:English
Subjects:
ALGORITHMS
COMPUTERIZED SIMULATION
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
COPPER
COPPER ALLOYS
DAMAGE
EVALUATION
FAILURES
FINITE ELEMENT METHOD
MATERIALS WORKING
NUMERICAL ANALYSIS
SHEETS
SURFACE AREA
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Summary:An efficient integration algorithm for continuum damage based elastoplastic constitutive equations is implemented in LS-DYNA. The isotropic damage parameter is defined as the ratio of the damaged surface area over the total cross section area of the representative volume element. This parameter is incorporated into the integration algorithm as an internal variable. The developed damage model is then implemented in the FEM code LS-DYNA as user material subroutine (UMAT). Pure stretch experiments of a hemispherical punch are carried out for copper sheets and the results are compared against the predictions of the implemented damage model. Evaluation of damage parameters is carried out and the optimized values that correctly predicted the failure in the sheet are reported. Prediction of failure in the numerical analysis is performed through element deletion using the critical damage value. The set of failure parameters which accurately predict the failure behavior in copper sheets compared to experimental data is reported as well.
ISSN:0094-243X
1551-7616
DOI:10.1063/1.2011253