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Forming Limits Prediction of the Sheet Metal Forming Process by the Energy-Based Damage Model

Published online by Cambridge University Press:  05 May 2011

H.-Y. Yeh  and
J.-H. Cheng
H.-Y. Yeh*
Affiliation:
Department of Mechanical Engineering, National Taiwan University, Taipei, Taiwan 10617, R.O.C.
J.-H. Cheng*
Affiliation:
Department of Mechanical Engineering, National Taiwan University, Taipei, Taiwan 10617, R.O.C.
*
*Graduate student
**Professor, corresponding author
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Abstract

An energy-based damage model is proposed and applied to predict the fracture initiation of the sheet metal forming process. The fracture mechanism is investigated through the plastic energy dissipation. The concepts of the damaging work and the fracture energy are proposed for the quantitative description of damage evolution and crack initiation. The developed formulations are implemented into the finite element program ABAQUS to simulate the biaxial stretching of sheet metals and to predict the fracture strains. The material parameter needed in the damage model for fracture prediction is determined by the stress-strain history of the uniaxial tensile test. The forming limits for aluminum alloy sheets under various strain paths are predicted by the present approach and then compared to the measured data quoted from the literatures [1,2]. Good agreements are found between this study and the previous results.

Keywords

Damage modelSheet metal formingFracture energyFinite element simulationForming limit diagram (FLD).
Type
Articles
Information
Journal of Mechanics , Volume 22 , Issue 1 , March 2006 , pp. 43 - 50
Copyright
Copyright © The Society of Theoretical and Applied Mechanics, R.O.C. 2006

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References

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