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Creep of Single Crystals – Modelling and Numerical Aspects
Author(s) -
Vladimirov Ivaylo,
Reese Stefanie,
Eggeler Gunther
Publication year - 2005
Publication title -
pamm
Language(s) - English
Resource type - Journals
ISSN - 1617-7061
DOI - 10.1002/pamm.200510116
Subject(s) - creep , superalloy , materials science , constitutive equation , plasticity , work (physics) , phenomenological model , crystal plasticity , single crystal , variable (mathematics) , extension (predicate logic) , thermodynamics , statistical physics , mechanics , computer science , metallurgy , finite element method , mathematics , crystallography , composite material , microstructure , physics , mathematical analysis , chemistry , statistics , programming language
A number of constitutive models, utilizing both microstructural and/or phenomenological considerations, have been developed for the simulation of the creep behaviour of nickel‐base single crystal superalloys at elevated temperatures. In this work, emphasis is placed on the rate‐dependent single crystal plasticity model [1]. A strategy for the identification of the material parameters of the model to fit the results from experiments has been implemented. The parameter fitting methodology rests upon a two‐membered evolution strategy. In addition, a proposal is made for the extension of the Cailletaud model [1] by means of an evolution equation for a damage variable which enables the modelling of the tertiary creep stage. (© 2005 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)