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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dc.contributor.author Jernkvist, Lars Olof
dc.contributor.author Massih, Ali
dc.date.accessioned 2013-12-20T12:57:22Z
dc.date.available 2013-12-20T12:57:22Z
dc.date.issued 2013 en_US
dc.identifier.uri http://hdl.handle.net/2043/16441
dc.description.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. en_US
dc.language.iso eng en_US
dc.subject.classification Technology en_US
dc.title Modeling stress and temperature history effects on the initiation of hydride cracks at blunt flaws in Zr-2.5%Nb pressure tubes en_US
dc.type Conference Poster en_US
dc.relation.url http://www.matscitech.org/mst2013/ en_US
dc.contributor.department Malmö University. Faculty of Technology and Society en
dc.subject.srsc Research Subject Categories::TECHNOLOGY en_US
dc.identifier.url http://www.programmaster.org/PM/PM.nsf/ApprovedAbstracts/6EDEE31313E6357385257B2C004B2DF8?OpenDocument
dcterms.description.conferenceName Materials Science & Technology (MS&T)
dcterms.description.conferencePlace Montreal, QC, Canada
dcterms.description.conferenceYear 2013
mahlocal.rights.oaType green
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