Prediction of creep crack initiation under transient stress conditions

Catrin M. Davies, Noel P. O'Dowd, Kamran M. Nikbin, George A. Webster

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

A method to predict the time for creep crack initiation (CCI) from a stationary crack tip is presented. The method is relevant to situations where small scale yield or widespread plasticity conditions prevail on initial loading. Initiation is considered to occur at the attainment of a critical creep strain at a small distance from the crack tip. The model proposed here considers the integrated effects of creep strain accumulation as the stress distribution changes from that on initial loading (controlled by J) to the steady state creep stress distribution (controlled by C*). Material properties are chosen to represent Type 316H stainless steel at 550°C and plane strain conditions are considered. For the conditions examined, the CCI times predicted are significantly shorter times than those predicted using a steady state creep model.

Original languageEnglish
Title of host publicationProceedings of 2006 ASME Pressure Vessels and Piping Division Conference - ASME PVP2006/ICPVT-11 Conference - Pressure Vessel Technologies for the Global Community
DOIs
Publication statusPublished - 2006
Externally publishedYes
EventASME PVP2006/ICPVT-11 Conference - Vancouver, BC, Canada
Duration: 23 Jul 200627 Jul 2006

Publication series

NameAmerican Society of Mechanical Engineers, Pressure Vessels and Piping Division (Publication) PVP
Volume2006
ISSN (Print)0277-027X

Conference

ConferenceASME PVP2006/ICPVT-11 Conference
Country/TerritoryCanada
CityVancouver, BC
Period23/07/0627/07/06

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