Use of a simplified analytical expression for metastable thermal stress analysis and its application to creep-fatigue damage of a 2.25Cr 1Mo thick walled component

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dc.contributor.authorPayten, WMen_AU
dc.contributor.authorSnowden, KUen_AU
dc.contributor.authorBendeich, PJen_AU
dc.date.accessioned2010-07-05T05:19:19Zen_AU
dc.date.available2010-07-05T05:19:19Zen_AU
dc.date.issued2010-02en_AU
dc.date.statistics2010-02en_AU
dc.description.abstractThick walled pressure vessels are of considerable importance in a wide range of industries. The evaluation of stresses is necessary not only from a design point of view but also for fitness for service analysis of ageing infrastructure. The accumulation of creep–fatigue damage over time is the principal damage mechanism which will eventually lead to crack initiation in critical high temperature fossil plants. Many power stations are being subjected to two-shift operation due to changes in demand and competition from cheaper energy sources, and in the future from added carbon taxes. To assess high temperature components for creep–fatigue damage for example, under faster ramp rates and additional cycles, as a first pass it would be useful to explore the feasible operational envelope using simplified calculations. These are, however, generally not available and more complex finite element analysis is necessary. This paper uses a simplified closed form solution for metastable thermal stresses in thick walled pressure vessels. This form of solution can if necessary be used with either stress concentration factors or superposition of polynomials for more complex components derived from FEA analysis, such that the closed form solution can be used to estimate any ramp rate on the unit. In this case the ramp rates are considered to provide sufficient time to become metastable. Many existing units rely on heavy section 2.25Cr 1Mo steel (P22) pipe-work and tubing, and hence for two shifting can be subjected to high levels of cyclic strain. Based on the simplified expression developed, an operational envelope is explored for thick walled cylinders constructed using P22 steel. Creep–fatigue damage is calculated based on the R5 methodology. The analysis shows that for thick walled components with minimal stress concentrations, creep will dominate the life of the component. However, complex interaction between base rupture, onset of significant cycling, creep, and fatigue dictates the upper bound on feasible ramp rates, as a result it is possible to construct screening curves based on the effective elastic stress intensity range. © 2010, Elsevier Ltd.en_AU
dc.identifier.citationPayten, W. M., Snowden, K. U., & Bendeich, P. (2010). Use of a simplified analytical expression for metastable thermal stress analysis and its application to creep-fatigue damage of a 2.25Cr 1Mo thick walled component. International Journal of Fatigue, 32(2), 368-375. doi:10.1016/j.ijfatigue.2009.07.007en_AU
dc.identifier.govdoc1855en_AU
dc.identifier.issn0142-1123en_AU
dc.identifier.issue2en_AU
dc.identifier.journaltitleInternational Journal of Fatigueen_AU
dc.identifier.pagination368-375en_AU
dc.identifier.urihttp://dx.doi.org/10.1016/j.ijfatigue.2009.07.007en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/1755en_AU
dc.identifier.volume32en_AU
dc.language.isoenen_AU
dc.publisherElsevieren_AU
dc.subjectFatigueen_AU
dc.subjectThermal stressesen_AU
dc.subjectCreepen_AU
dc.subjectPressure vesselsen_AU
dc.subjectDamageen_AU
dc.subjectMetastable statesen_AU
dc.titleUse of a simplified analytical expression for metastable thermal stress analysis and its application to creep-fatigue damage of a 2.25Cr 1Mo thick walled componenten_AU
dc.typeJournal Articleen_AU
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