A comparative study of a single damage-parameter life prediction method and a physically-based damage mechanics method

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Abstract

This paper presents a comparison between the life predictions from a physically-based damage mechanics formulation, which captures the fracture mechanism of intergranular cavitation, via three state variables, describing intergranular creep cavitation, coarsening of carbide precipitates and primary creep softening, and a corresponding single-damage mechanics formulation, of the Kachanov-type. The comparison is made for a 0.5Cr0.5Mo0.25V ferritic steel at a temperature of 635°C across a range of stress levels on the basis of a notched bar stress-state. Simplified predictions based on the R5 reference stress method are also given for comparative purposes.

Original languageEnglish
Title of host publicationASME 2008 Pressure Vessels and Piping Conference, PVP2008
Pages1195-1200
Number of pages6
EditionPARTS A AND B
DOIs
Publication statusPublished - 2008
Externally publishedYes
EventASME 2008 Pressure Vessels and Piping Conference, PVP2008 - Chicago, IL, United States
Duration: 27 Jul 200831 Jul 2008

Publication series

NameAmerican Society of Mechanical Engineers, Pressure Vessels and Piping Division (Publication) PVP
NumberPARTS A AND B
Volume6
ISSN (Print)0277-027X

Conference

ConferenceASME 2008 Pressure Vessels and Piping Conference, PVP2008
Country/TerritoryUnited States
CityChicago, IL
Period27/07/0831/07/08

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