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On the formation of expanding crack tip precipitates
Malmö University, Faculty of Technology and Society (TS), Department of Materials Science and Applied Mathematics (MTM).ORCID iD: 0000-0001-6532-6720
2019 (English)In: International Journal of Fracture, ISSN 0376-9429, E-ISSN 1573-2673, Vol. 217, no 1-2, p. 35-48Article in journal (Refereed) Published
Abstract [en]

The stress driven growth of an expanding precipitate at a crack tip is studied. The material is assumed to be linearly elastic, and the expansion is considered to be isotropic or transversely isotropic. The extent of the precipitate is expected to be small as compared with the crack length and distance to boundaries. The problem has only a single length scale given by the squared ratio of the stress intensity factor and a critical hydrostatic stress that initiates the growth of the precipitate. Therefore, the growth occurs under self-similar conditions. The equations on non-dimensional form show that the free parameters are expansion strain, degree of anisotropy and Poisson's ratio. It is found that the precipitate, once initiated, grows without remote load for expansion strains above a critical value. The anisotropy of the expansion strongly affects the shape of the precipitate but does not have a large effect on the crack tip shielding.

Place, publisher, year, edition, pages
Springer, 2019. Vol. 217, no 1-2, p. 35-48
Keywords [en]
Growth of precipitates, Stress driven, Anisotropic expansion, Crack tip shielding, Zirconium hydride
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:mau:diva-2645DOI: 10.1007/s10704-019-00360-2ISI: 000474393100002Scopus ID: 2-s2.0-85065434837Local ID: 30236OAI: oai:DiVA.org:mau-2645DiVA, id: diva2:1399408
Available from: 2020-02-27 Created: 2020-02-27 Last updated: 2024-04-08Bibliographically approved

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Ståhle, PerFisk, Martin

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