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Creep-Fatigue Assessment

Posted on 28. October, 2011.

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The problems of assessing creep-fatigue interaction in power plant steels are reviewed in the latest issue of Materials at High Temperatures. Stuart Holdsworth describes how defect-free or defect assessment procedures may be employed depending on component materials.

The consideration of a steel’s resistance to creep-fatigue crack initiation and development is an important part of the integrity assessment of high temperature power plant components. Defect-free or defect assessment procedures may be employed depending on the product form from which the component is manufactured, and the criteria adopted for design, inspection-management and remaining-life evaluations. Such assessment procedures require a comprehensive knowledge of the creep-fatigue properties of the component materials, and these are reviewed. Creep-fatigue defect-free and defect assessment procedures require a significant quantity of material property data to provide calculation input parameters and the necessary information for analysis method benchmark verification. The results from cyclic/hold tests provide a useful contribution to this required knowledge base.

doi: 10.3184/096034011X13123676561681

flowchart

In picture: Generic flow diagram with common steps in a number of creep-fatigue assessment procedures.

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