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Fracture of Zr-alloy pressure tubes due to hydride blister formation
Malmö högskola, School of Technology (TS).
2006 (English)In: Proceedings of the 19th Nordic Seminar on Computational Mechanics Lund, 20-21 October, 2006, 2006, p. 101-104Conference paper, Published paper (Refereed)
Abstract [en]

Hydrogen migration under thermal stress gradient in zirconium alloys results in formation of hydride blisters [1]. An array of blisters makes Zirconium alloy components of nuclear reactors susceptible to fracture [2]. The whole process of hydride blister formation and fracture of these components is very complex and involves hydrogen migration under thermal gradient, hydride precipitation, straining of the matrix, setting up of hydrostatic stress gradient, enhanced hydrogen migration under the combined influence of thermal and stress gradient, stress-reorientation of hydrides [3], cracking of hydrides, crack growth by delayed hydride cracking mechanism [4], interlinking of blisters and spontaneous fracture of the component. In this work we estimate the stress components in hydride blisters and the surrounding matrix for certain assumed blister depths. The estimated stress predicts the hydride orientation in the matrix surrounding the blisters and will be subsequently used to model the hydrogen diffusion under hydrostatic stress and temperature gradients.

Place, publisher, year, edition, pages
2006. p. 101-104
Series
Report TVSM, ISSN 0281-6679
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:mau:diva-12381Local ID: 4821OAI: oai:DiVA.org:mau-12381DiVA, id: diva2:1409428
Conference
Nordic Seminar on Computational Mechanics, Lund, Sweden (2006)
Available from: 2020-02-29 Created: 2020-02-29 Last updated: 2022-06-27Bibliographically approved

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Ståhle, Per

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