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New model describing creep of metallic materials under variable temperatures
Author(s) -
Batsoulas Nikolaos D.
Publication year - 1994
Publication title -
steel research
Language(s) - English
Resource type - Journals
eISSN - 1869-344X
pISSN - 0177-4832
DOI - 10.1002/srin.199400938
Subject(s) - creep , materials science , stress (linguistics) , constant (computer programming) , constitutive equation , function (biology) , thermodynamics , mechanics , metallurgy , physics , computer science , finite element method , linguistics , philosophy , evolutionary biology , biology , programming language
A creep function using only three fitting parameters is presented hereafter. The function is derived from a more general physical ‐ phe‐nomenoiogical model representing metallic materials creep behaviour and describes all three stages of creep. The dependence of the fitting parameters upon the temperature are investigated and simple analytical relations are provided for that purpose. Those relations already incorporate the effect of stress. At the outcome, ten material constants are derived which are neither dependent on the stress nor on the temperature. On the basis of the derived constitutive relations a prediction is carried out for creep strain of three metallic materials and particularly steels, at different temperatures and under constant stress. The derived curves agree with the experiments, not only the ones carried out in the laboratory but also the ones taken from literature.