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Constitutive equations of the minimum creep rate for 9% Cr heat resistant steels
Materials Science and Engineering: A, 2012This study addresses the overestimation of the time-temperature-parameter (TTP) method on the allowable creep strength of 9-12% Cr heat resistant steels. Creep data of 9% Cr heat resistant steels are divided into several data sets according to the creep controlling mechanism.
Y.X. Chen +4 more
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Recent progress on the modelling of the minimum creep strain rate and the creep cavitation damage and fracture [PDF]
Materials at High Temperatures, 2022 Modelling of the long-term creep damage and lifetime is very challenging due to their strong stress level dependence. Aiming at developing a set of creep damage constitutive equations suitable for long-term service, research was carried out in modelling ...
Qiang Xu, Zhongyu Lu
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The relationship between minimum creep rate and rupture time in Cr-Mo steels
Journal of Materials Engineering and Performance, 1992The Monkman-Grant equation is widely used to relate the minimum creep rate, emin,and the rupture time, tr, in creep. However, for materials that exhibit large tertiary creep and limited secondary creep, the above equation has not been found to be valid, and a correction in terms of the rupture strain er and the strain at the onset of tertiary stage ...
V M Radhakrishnan, Radhakrishnan V M
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Comparison of Cu and Ti–52Al in creep at the same homologous temperature and minimum creep rate
Intermetallics, 2001Abstract The present work discusses conditions of comparable creep behaviour of a metal (copper) and an intermetallic compound (Ti–52Al). It compares three “similar” creep curves obtained at the same homologous temperature and showing the same minimum creep rate.
Alena Orlova
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Incorporating the Wilshire equations for time to failure and the minimum creep rate into a continuum damage mechanics for the creep strain of Waspaloy [PDF]
Materials at High Temperatures, 2022 In this paper, a new constitutive model is presented that combines the Wilshire equations with a modified Kachanov-Rabotnov continuum damage mechanics (CDM) to enable the prediction of uniaxial creep curves that contain both a primary and tertiary stage.
Mark Evans
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Development and Application of Minimum Creep Strain Rate Metamodeling
Volume 7A: Structures and Dynamics, 2019Abstract Numerous minimum-creep-strain-rate laws exist, creating a challenge in determining which is best for a given material database. The objective of this study is to validate the applicability of a “metamodel” and its ability to model the minimum creep strain rate (MCR).
Ricardo Vega, Calvin Stewart
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On the minimum creep rate of β-cobalt
Philosophical Magazine, 1964Abstract Flinn and Gilbert (1964) recently re-plotted the graphs of Feltham and Myers (1963), relating the logarithm of the minimum tensile creep rate, e, of β-cobalt and the inverse of the temperature for creep at 720–1020°K. They maintain that on extrapolating the re-plotted graphs in a certain manner below the range of strain rates used in the ...
T. A. Myers, P. Feltham
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The relation between minimum creep rate and time to fracture
Metal Science, 1976(1976). The relation between minimum creep rate and time to fracture. Metal Science: Vol. 10, No. 11, pp. 382-384.
F. Dobeš, K. Milička
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The transitional behaviour of the minimum creep rate of β-cobalt
Philosophical Magazine, 1964Abstract Published data (Feltham and Myers 1963) on the second stage, minimum creep rate of β-cobalt have been analysed for stress and temperature dependence. Three distinct stress functions and activation energies connected by regions of transition were found which behaved as parallel or additive processes over the temperature range of 450 to 750°C ...
J. E. Flinn, E. R. Gilbert
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