Thermal fatigue of NPP components: potential multiaxial, environmental and small cycle effects

Gary Marquis, Jussi Solin

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

Abstract

Current fatigue design curves for NPP components are based largely on strain controlled tests of small specimens tested in air at room temperature. Reduction factors of 2 for strain or 20 for fatigue life are applied to the mean data and are intended to account for material, environment, surface finish and loading uncertainties. Pipe failures in recent years have been attributed to high cycle thermomechanical fatigue and have prompted re-evaluation of the fatigue design curves. Research has focussed especially on environmental effects and load sources. Some data also suggests that multiaxial loading and small stress cycles as part of a spectrum may cause significantly more fatigue damage than what is predicted. This paper examines some of these potential sources of fatigue damage.
Original languageEnglish
Title of host publicationPlant Life Management
Subtitle of host publicationMidterm status of a R&D project
Place of PublicationEspoo
PublisherVTT Technical Research Centre of Finland
Pages67-90
ISBN (Electronic)951-38-5728-X
ISBN (Print)951-38-5727-1
Publication statusPublished - 2001
MoE publication typeA4 Article in a conference publication
EventPlant Life Management: Midterm status of a R&D project - Espoo, Finland
Duration: 1 Jan 20011 Jan 2001

Publication series

SeriesVTT Symposium
Number218
ISSN0357-9387

Conference

ConferencePlant Life Management
CountryFinland
CityEspoo
Period1/01/011/01/01

Fingerprint

Thermal fatigue
Fatigue of materials
Fatigue damage
Environmental impact
Pipe
Air
Temperature

Cite this

Marquis, G., & Solin, J. (2001). Thermal fatigue of NPP components: potential multiaxial, environmental and small cycle effects. In Plant Life Management: Midterm status of a R&D project (pp. 67-90). Espoo: VTT Technical Research Centre of Finland. VTT Symposium, No. 218
Marquis, Gary ; Solin, Jussi. / Thermal fatigue of NPP components: potential multiaxial, environmental and small cycle effects. Plant Life Management: Midterm status of a R&D project. Espoo : VTT Technical Research Centre of Finland, 2001. pp. 67-90 (VTT Symposium; No. 218).
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Marquis, G & Solin, J 2001, Thermal fatigue of NPP components: potential multiaxial, environmental and small cycle effects. in Plant Life Management: Midterm status of a R&D project. VTT Technical Research Centre of Finland, Espoo, VTT Symposium, no. 218, pp. 67-90, Plant Life Management, Espoo, Finland, 1/01/01.

Thermal fatigue of NPP components: potential multiaxial, environmental and small cycle effects. / Marquis, Gary; Solin, Jussi.

Plant Life Management: Midterm status of a R&D project. Espoo : VTT Technical Research Centre of Finland, 2001. p. 67-90 (VTT Symposium; No. 218).

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

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AB - Current fatigue design curves for NPP components are based largely on strain controlled tests of small specimens tested in air at room temperature. Reduction factors of 2 for strain or 20 for fatigue life are applied to the mean data and are intended to account for material, environment, surface finish and loading uncertainties. Pipe failures in recent years have been attributed to high cycle thermomechanical fatigue and have prompted re-evaluation of the fatigue design curves. Research has focussed especially on environmental effects and load sources. Some data also suggests that multiaxial loading and small stress cycles as part of a spectrum may cause significantly more fatigue damage than what is predicted. This paper examines some of these potential sources of fatigue damage.

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Marquis G, Solin J. Thermal fatigue of NPP components: potential multiaxial, environmental and small cycle effects. In Plant Life Management: Midterm status of a R&D project. Espoo: VTT Technical Research Centre of Finland. 2001. p. 67-90. (VTT Symposium; No. 218).