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A new concept for the calculation of the mobile dislocation density in constitutive models of strain hardening
Author(s) -
Roters F.
Publication year - 2003
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200301873
Subject(s) - dislocation , constitutive equation , flow stress , strain hardening exponent , hardening (computing) , strain rate , materials science , mechanics , plasticity , constant (computer programming) , statistical physics , thermodynamics , physics , computer science , composite material , finite element method , layer (electronics) , programming language
A new concept for the calculation of the mobile dislocation density in constitutive models is presented. In contrast to earlier approaches this concept does not use rate equations to calculate the evolution of the mobile dislocation density but is based on the minimization of the flow stress in each increment. In comparison to a concept using a constant value for the mobile dislocation density the new concept results in a more realistic stress strain relation, especially when applied to strain rate change experiments. (© 2003 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)