Journal Article10.1115/1.4006856
Primary Creep Modeling Based on the Dependence of the Activation Energy on the Internal Stress
Luca Esposito,Nicola Bonora +1 more
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TL;DR: In this paper, a mechanism based model for primary creep has been derived assuming that the creep rate in the transient regime can be given as a fraction of the steady state creep rate and as a function of the internal stress.
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Abstract: In the high temperature component design the accumulation of creep strain during the primary stage cannot be ignored, since most the allowable design strain occurs in this stage, for which appropriate modelling is needed. In this work a mechanism based model for primary creep has been derived assuming that the creep rate in the transient regime can be given as a fraction of the steady state creep rate and as a function of the internal stress. Taking into account that the apparent activation energy varies with the internal stress and that the internal stress kinetic can be given as a function of strain, an exponential form of the creep rate vs creep strain has been obtained. The proposed model has been applied to high chromium steel P91 and the evolution of the decay constant and scaled activation volume with the applied stress has been determined.Copyright © 2010 by ASME
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Citations
Creep behaviour of AISI 316H stainless steel under stress-varying creep loading conditions: primary creep regeneration
TL;DR: In this paper, the primary creep regeneration (PCR) is reported from creep under stress-varying conditions for several alloys, and for a specimen deforming in the secondary creep regime, a stress...
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Analytical formulation of the contact pressure evolution for interference joints under creep regime
TL;DR: In this paper, an analytical formulation to evaluate the contact pressure evolution in interference fit joints working under high temperature regime is proposed, which is mainly due to the stress relaxation related to the creep behavior of materials used to realize this kind of joints.
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Study on creep characteristics of oil film bearing Babbitt
TL;DR: According to the creep deformation of oil film bearing Babbitt in operation process, the creep test method has been put forward, the factors about influencing the results of creep test were analyzed, and the creep testing research of babbitt was carried out.
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A three-stage constitutive model for the creep behaviours of high-Cr steels at elevated temperatures
Xiao-dan Cai,Jiong Wang +1 more
TL;DR: In this article, a three-dimensional constitutive model is proposed to simulate the creep behaviors of high-Cr steels at elevated temperatures, where the minimum creep rate and the average creep rupture time at different temperatures and stress levels are predicted by adopting two Larson-Miller parameters.
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