The increasing demand of reliable creep design for very long lives (exceeding 100.000 h), as those for high stress-low temperatures and high temperature-low stress regimes, requires a model formulation capable to account for the nonlinearity in the stress dependence of the logarithm of the creep rate as a result of the combination of both diffusional and dislocation type creeps. In this paper, a creep model, where the effect of mechanism change has been accounted for through an explicit dependence of the creep exponent on stress, has been proposed. The model has been also extended, incorporating damage processes and characteristics of tertiary creep stage, adopting a time independent damage formulation proposed by the authors. An application example of the proposed approach to high purity aluminum is given.
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April 2010
Research Papers
Mechanism Based Creep Model Incorporating Damage
Nicola Bonora,
Nicola Bonora
Department of Mechanics, Structures and Environment (DiMSAT),
University of Cassino
, Via G. Di Biasio 43, 03043 Cassino (FR), Italy
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Luca Esposito
Luca Esposito
Department of Mechanics, Structures and Environment (DiMSAT),
University of Cassino
, Via G. Di Biasio 43, 03043 Cassino (FR), Italy
Search for other works by this author on:
Nicola Bonora
Department of Mechanics, Structures and Environment (DiMSAT),
University of Cassino
, Via G. Di Biasio 43, 03043 Cassino (FR), Italy
Luca Esposito
Department of Mechanics, Structures and Environment (DiMSAT),
University of Cassino
, Via G. Di Biasio 43, 03043 Cassino (FR), ItalyJ. Eng. Mater. Technol. Apr 2010, 132(2): 021013 (7 pages)
Published Online: February 22, 2010
Article history
Received:
March 19, 2009
Revised:
November 16, 2009
Online:
February 22, 2010
Published:
February 22, 2010
Citation
Bonora, N., and Esposito, L. (February 22, 2010). "Mechanism Based Creep Model Incorporating Damage." ASME. J. Eng. Mater. Technol. April 2010; 132(2): 021013. https://doi.org/10.1115/1.4000822
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