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Mechanism Based Unified Creep Model Incorporating Damage

[+] Author Affiliations
Nicola Bonora, Luca Esposito

University of Cassino, Cassino, FR, Italy

Paper No. PVP2008-61034, pp. 1189-1193; 5 pages
  • ASME 2008 Pressure Vessels and Piping Conference
  • Volume 6: Materials and Fabrication, Parts A and B
  • Chicago, Illinois, USA, July 27–31, 2008
  • Conference Sponsors: Pressure Vessels and Piping
  • ISBN: 978-0-7918-4829-6
  • Copyright © 2008 by ASME


Although it is often said that diffusional flow creep is out of the practical engineering applications, the need for a unified model capable to account for the resulting action of both diffusional and dislocation type creep is justified by the increasing demands of reliable creep design for very long lives (exceeding 100.000h), high stress-low temperatures and high temperature-low stress regimes. In this paper, a unified creep model formulation, in which the change of the creep mechanism has been accounted for through an explicit dependence of the exponent n on stress and temperature, has been proposed. The model has been also extended incorporating damage processes, characteristics of creep stage IV, adopting a time independent damage formulation proposed by the authors. An application example of the proposed approach to high purity aluminum is given.

Copyright © 2008 by ASME
Topics: Creep , Mechanisms



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