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Self-inflicted fracture of expanding surface precipitates
Blekinge Institute of Technology, Faculty of Engineering, Department of Mechanical Engineering.
Lunds universitet, SWE.
2018 (English)In: Fatigue & Fracture of Engineering Materials & Structures, ISSN 8756-758X, E-ISSN 1460-2695, Vol. 41, no 12, p. 2614-2628Article in journal (Refereed) Published
Abstract [en]

This work concerns spontaneous fracture of growing brittle precipitates in an elastic plastic matrix. The mass of the precipitate is increasing as more transformed matrix material is added to it. Under stress-free conditions, the new phase occupies a larger volume than the original matrix material. Just outside the expanding precipitate, the matrix undergoes stretching beyond the elastic limit. The influence of the elastic plastic material behaviour is studied. A phase field model that keeps track of the phase composition is used. Both cases with a crack and without a crack are included. The growth histories from microscopic to macroscopic precipitate sizes are followed. Growth of the precipitate is very slow and quasi-static mechanical equilibrium is assumed at all time. The result is compared with observations of hydride blisters that are formed on surfaces of zirconium alloys. The numerical model is qualified against a derived exact solution for a cylindrical precipitate without a crack. The numerical result predicts a position of the growing crack that is confirmed by the observations. Also, the predicted length of the crack is in fair agreement with the experimental observations. The depth of the blister is slightly larger than what is found at the experiments. Also, it is found that the incorporated transformed phase rejects the compression, which creates an increasing tensile stress in the inner part of the precipitate. © 2018 Wiley Publishing Ltd.

Place, publisher, year, edition, pages
Blackwell Publishing Ltd , 2018. Vol. 41, no 12, p. 2614-2628
Keywords [en]
Cracks, Elastoplasticity, Fracture, Zirconium alloys, Elastic-plastic Material, Matrix materials, Mechanical equilibrium, Numerical results, Phase field models, Spontaneous fractures, Stress-free conditions, Surface precipitate, Precipitates
National Category
Other Mechanical Engineering
Identifiers
URN: urn:nbn:se:bth-16923DOI: 10.1111/ffe.12872ISI: 000449690900014Scopus ID: 2-s2.0-85050402767OAI: oai:DiVA.org:bth-16923DiVA, id: diva2:1240308
Funder
Swedish Research Council, 2011-5561Available from: 2018-08-21 Created: 2018-08-21 Last updated: 2018-11-29Bibliographically approved

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Reheman, Wureguli

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