Effects of prior stress relaxation on the prediction of creep life using time and strain based methods

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dc.contributor.authorPayten, WMen_AU
dc.contributor.authorSnowden, KUen_AU
dc.contributor.authorDean, DWen_AU
dc.contributor.authorHumphries, SRen_AU
dc.contributor.authorEdwards, Len_AU
dc.date.accessioned2025-02-14T02:15:39Zen_AU
dc.date.available2025-02-14T02:15:39Zen_AU
dc.date.issued2010-07-18en_AU
dc.date.statistics2025-02-14en_AU
dc.description.abstractA critical requirement for both next generation conventional and nuclear plants is the development of simplified inelastic design and fitness for purposes procedures that give a reasonably accurate prediction of the complex multi-axial time dependent stress strain behavior. The accumulation of this inelastic strain in the form of coupled creep-fatigue damage over time is one of the principal damage mechanisms which will eventually lead to crack initiation in critical high temperature equipment. Two main procedures that address creep-fatigue loading are generally used, either a time fraction or a ductility exhaustion approach. It is generally accepted that these methods enable conservative predictions within a factor of 2 to 3 and hence are reliable methods for code based design and fitness for purpose type assessments. However, for complex cycles, this may not be the case, for example prior relaxation cycles are found to accelerate the creep rupture of the material with the result that a significant reduction in creep life can be observed. An investigation was undertaken into the influence of prior relaxation on resultant failure using a typical low alloy ferritic power station steel. Both time based and strain based methods were used to predict the damage caused by the stress relaxation cycles followed by operation at steady state. The predictions found that while ductility exhaustion methodologies based on mean properties where adequate in predicting the failure life, time fraction methods were found to be extremely non-conservative for mean properties and only lower bound solutions provided an estimate of remaining creep life. The Monkman-Grant approach resulted in predictions that erred on the conservative side. The results have implications for both current and future conventional and nuclear power stations as it may be difficult for time based approaches to accurately account for complex cycling, shakedown conditions or stress relaxation at welds. © 2013 by ASMEen_AU
dc.identifier.booktitleASME 2010 Pressure Vessels and Piping Conference: Volume 6, Parts A and Ben_AU
dc.identifier.citationPayten, W. M., Snowden, K. U., Dean, D. W., Humphries, S. R., & Edwards, L. (2010). Effects of prior stress relaxation on the prediction of creep life using time and strain based methods. Paper presented to the ASME 2010 Pressure Vessels and Piping Division/K-PVP Conference, July 18–22, 2010 Bellevue, Washington, USA. In Kunio Hasegawa and American Society of Mechanical Engineers Pressure Vessels and Piping Division (eds), ASME 2010 Pressure Vessels and Piping Conference: Volume 6, Parts A and B, July 18–22, 2010, Bellevue, Washington, USA, (pp. 365-376). ASME. doi:10.1115/PVP2010-25291en_AU
dc.identifier.conferenceenddate2010-07-22en_AU
dc.identifier.conferencenameASME 2010 Pressure Vessels and Piping Division/K-PVP Conferenceen_AU
dc.identifier.conferenceplaceBellevue, Washington, USAen_AU
dc.identifier.conferencestartdate2010-07-16en_AU
dc.identifier.editorsKunio Hasegawa and American Society of Mechanical Engineers. Pressure Vessels and Piping Divisionen_AU
dc.identifier.isbn9780791849255en_AU
dc.identifier.issn0277-027Xen_AU
dc.identifier.issueParts A and Ben_AU
dc.identifier.pagination365-376en_AU
dc.identifier.urihttps://doi.org/10.1115/pvp2010-25291en_AU
dc.identifier.urihttps://apo.ansto.gov.au/handle/10238/15993en_AU
dc.identifier.volume6en_AU
dc.language.isoenen_AU
dc.publisherASME Internationalen_AU
dc.subjectResidual stressesen_AU
dc.subjectStrain rateen_AU
dc.subjectNuclear facilitiesen_AU
dc.subjectTemperature rangeen_AU
dc.subjectCreepen_AU
dc.subjectFatigueen_AU
dc.subjectMaterialsen_AU
dc.subjectDamageen_AU
dc.subjectDuctilityen_AU
dc.subjectRupturesen_AU
dc.subjectDesignen_AU
dc.subjectRelaxationen_AU
dc.titleEffects of prior stress relaxation on the prediction of creep life using time and strain based methodsen_AU
dc.typeConference Paperen_AU
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