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 n 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.

Mechanism Based Creep Model Incorporating Damage / Bonora, N; Esposito, Luca. - In: JOURNAL OF ENGINEERING MATERIALS AND TECHNOLOGY. - ISSN 0094-4289. - 132:2(2010), pp. 0210131-0210137. [10.1115/1.4000822]

Mechanism Based Creep Model Incorporating Damage

ESPOSITO, Luca
2010

Abstract

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 n 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.
2010
Mechanism Based Creep Model Incorporating Damage / Bonora, N; Esposito, Luca. - In: JOURNAL OF ENGINEERING MATERIALS AND TECHNOLOGY. - ISSN 0094-4289. - 132:2(2010), pp. 0210131-0210137. [10.1115/1.4000822]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11588/595510
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