Model Describing Material-Dependent Deformation Behavior in High-Velocity Metal Forming Processes
Publication: Journal of Engineering Mechanics
Volume 135, Issue 4
Abstract
A constitutive model for rate-dependent and thermomechanically coupled plasticity at finite strains is presented. The plasticity model is based on a model and rate-dependent behavior is included by use of a Perzyna-type formulation. Adiabatic heating effects are handled in a consistent way and not, as is a common assumption, through a constant conversion of the internal work rate into rate of heating. The conversion factor is instead derived from thermodynamic considerations. The stored energy is assumed to be a function of a single internal variable which differs from the effective plastic strain. This allows a thermodynamically consistent formulation to be obtained which, as shown, can be calibrated by use of simple procedures. Choosing 100Cr6 steel in two differently heat treated conditions as prototype material, experimental tests are performed, enabling the model to be calibrated. Significant differences in deformation behavior are noted as the differently heat treated specimens are compared. In addition, the local stress-updating procedure is reduced to a single scalar equation, permitting a very efficient numerical implementation of the model. The constitutive formulation proposed was employed in an explicit finite element solver, illustrative simulations of a high-velocity metal forming process being performed to demonstrate the capabilities of the model and certain characteristic traits of the materials that were studied.
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Acknowledgments
The first two writers gratefully acknowledge the funding provided by the ProViking program Simu-Net-Shape under grant SFF V03.22.
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Information & Authors
Information
Published In
Journal of Engineering Mechanics
Volume 135 • Issue 4 • April 2009
Pages: 345 - 357
Copyright
© 2009 ASCE.
History
Received: Dec 14, 2007
Accepted: Jul 1, 2008
Published online: Apr 1, 2009
Published in print: Apr 2009
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