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dc.contributor.authorMartínez-Pañeda, Emilioen
dc.contributor.authorNiordson, Christianen
dc.date.accessioned2019-07-10T14:23:16Z
dc.date.available2019-07-10T14:23:16Z
dc.date.issued2016-05-01en
dc.identifier.issn0749-6419
dc.identifier.urihttps://www.repository.cam.ac.uk/handle/1810/294523
dc.description.abstractAll rights reserved. In this work a general framework for damage and fracture assessment including the effect of strain gradients is provided. Both mechanism-based and phenomenological strain gradient plasticity (SGP) theories are implemented numerically using finite deformation theory and crack tip fields are investigated. Differences and similarities between the two approaches within continuum SGP modeling are highlighted and discussed. Local strain hardening promoted by geometrically necessary dislocations (GNDs) in the vicinity of the crack leads to much higher stresses, relative to classical plasticity predictions. These differences increase significantly when large strains are taken into account, as a consequence of the contribution of strain gradients to the work hardening of the material. The magnitude of stress elevation at the crack tip and the distance ahead of the crack where GNDs significantly alter the stress distributions are quantified. The SGP dominated zone extends over meaningful physical lengths that could embrace the critical distance of several damage mechanisms, being particularly relevant for hydrogen assisted cracking models. A major role of a certain length parameter is observed in the multiple parameter version of the phenomenological SGP theory. Since this also dominates the mechanics of indentation testing, results suggest that length parameters characteristic of mode I fracture should be inferred from nanoindentation.
dc.publisherElsevier
dc.titleOn fracture in finite strain gradient plasticityen
dc.typeArticle
prism.endingPage167
prism.publicationDate2016en
prism.publicationNameInternational Journal of Plasticityen
prism.startingPage154
prism.volume80en
dc.identifier.doi10.17863/CAM.17701
dcterms.dateAccepted2015-08-12en
rioxxterms.versionofrecord10.1016/j.ijplas.2015.09.009en
rioxxterms.versionAM*
rioxxterms.licenseref.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/en
rioxxterms.licenseref.startdate2016-05-01en
dc.contributor.orcidMartínez-Pañeda, Emilio [0000-0002-1562-097X]
dc.identifier.eissn1879-2154
rioxxterms.typeJournal Article/Reviewen
cam.issuedOnline2015-09-30en
dc.identifier.urlhttps://www.sciencedirect.com/science/article/pii/S074964191500162X?via%3Dihub#!en


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