Modeling stress and temperature history effects on the initiation of hydride cracks at blunt flaws in Zr-2.5%Nb pressure tubes

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Modeling stress and temperature history effects on the initiation of hydride cracks at blunt flaws in Zr-2.5%Nb pressure tubes

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Publication Conference Poster
Title Modeling stress and temperature history effects on the initiation of hydride cracks at blunt flaws in Zr-2.5%Nb pressure tubes
Author(s) Jernkvist, Lars Olof ; Massih, Ali
Date 2013
English abstract
We study initiation of hydride induced cracks in Zr-2.5%Nb CANDU reactor pressure tubes, containing blunt notches and exposed to temperature cycles by use of a novel computational model. The model uses a continuum description of the two-phase (alpha-phase metal plus delta-phase hydride) material, and solves the multi-field partial differential equations for temperature- and stress-directed hydrogen diffusion together with mechanical equilibrium in a finite element setting. Point-kinetics models are used for metal-hydride phase transformation and stress-directed orientation of hydrides, while a cohesive zone fracture model caters for initiation and propagation of cracks. Our calculations show that the propensity for crack initiation through hydride fracture at the notch during an overload event depends on the preceding histories of stress and temperature, and in particular, on the number of ratcheting thermal cycles experienced by the hydrided material. The calculated results agree favorably with experiments reported in open literature.
Link http://www.programmaster.org/PM/PM.nsf/ApprovedAbstracts/6EDEE31313E6357385257B2C004B2DF8?OpenDocument (external link to publication)
Language eng (iso)
Subject(s) Technology
Research Subject Categories::TECHNOLOGY
Note Meeting: Materials Science & Technology 2013 (MS&T'13 ), 27-31 October, Montreal, QC, Canada
Handle http://hdl.handle.net/2043/16441 (link to this page)
Link http://www.matscitech.org/mst2013/ (external link to related web page)

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