Physically Based Constitutive Model for Body Centered Cubic Metals with Applications to Iron
Publication: Journal of Engineering Mechanics
Volume 134, Issue 7
Abstract
A constitutive model is developed in this work to describe the mechanical behavior of body centered cubic metals under a wide range of strain rates and temperatures. The model is based on macromechanical state variables such as stress, strain, and material constants that include threshold and transition temperature as well as micromechanical terms such as mobile dislocation density and burgers vector. The principle of the activation energy and its dependence on temperature, strain rate, and stress is the key point in this proposed model. The model is used to simulate the experimental behavior of pure iron at various temperatures and strain rates in order to obtain the different model parameters. The model shows good capability in capturing the coupling between strain rate and temperature, plastic strain and strain rate, and plastic strain and temperature. The model is used to characterize the hardness of iron at low and high strain rates for a representative strain of 8%.
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Information & Authors
Information
Published In
Journal of Engineering Mechanics
Volume 134 • Issue 7 • July 2008
Pages: 521 - 529
Copyright
© 2008 ASCE.
History
Received: Feb 7, 2007
Accepted: Dec 10, 2007
Published online: Jul 1, 2008
Published in print: Jul 2008
Notes
Note. Associate Editor: Dinesh R. Katti
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