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Strain gradient crystal plasticity modelling of size effects in a hierarchical martensitic steel using the Voronoi tessellation method

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dc.contributor.author Sun, Fengwei
dc.contributor.author Meade, Edward D.
dc.contributor.author O'Dowd, Noel P.
dc.date.accessioned 2019-05-28T08:38:45Z
dc.date.issued 2019
dc.identifier.issn 0749-6419
dc.identifier.uri http://hdl.handle.net/10344/7863
dc.description peer-reviewed en_US
dc.description.abstract Inelastic deformation of a high-strength martensitic steel (P91) is investigated using a strain gradient crystal plasticity model implemented using the finite element method. Voronoi tessellation is used to model the hierarchical structure, prior austenite grain (PAG)/packet/block, of the martensitic steel and the effect of PAG/packet/block size on the macro- and micro-scale mechanical response is analysed numerically. The role of lath interaction and the influence of dislocation type (statistically stored and geometrically necessary dislocations) are investigated. It is found that block size determines the overall mechanical response, consistent with the Hall-Petch relation, while packet and block diameters influence the microplastic strain distribution. A modified Hall-Petch relation is examined which provides a relationship between material flow strength and block diameter (size) which holds for a wide range of initial dislocation densities and block diameters en_US
dc.language.iso eng en_US
dc.publisher Elsevier en_US
dc.relation 14IA2604 en_US
dc.relation.ispartofseries International Journal of Plasticity;119, pp.215-229
dc.relation.uri http://dx.doi.org/10.1016/j.ijplas.2019.03.009
dc.rights This is the author’s version of a work that was accepted for publication in International Journal of Plasticity. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in International Journal of Plasticity, 2019, 119, pp. 215-229, https://doi.org/10.1016/j.ijplas.2019.03.009 en_US
dc.subject crystal plasticity en_US
dc.subject finite element analysis en_US
dc.subject hall-petch en_US
dc.subject Martensite en_US
dc.subject microstructure en_US
dc.subject size effects en_US
dc.subject strain gradient plasticity en_US
dc.subject Voronoi tessellation en_US
dc.title Strain gradient crystal plasticity modelling of size effects in a hierarchical martensitic steel using the Voronoi tessellation method en_US
dc.type info:eu-repo/semantics/article en_US
dc.type.supercollection all_ul_research en_US
dc.type.supercollection ul_published_reviewed en_US
dc.date.updated 2019-05-28T08:05:31Z
dc.identifier.doi 10.1016/j.ijplas.2019.03.009
dc.contributor.sponsor SFI en_US
dc.contributor.sponsor Irish Center for High-End Computing (ICHEC) en_US
dc.relation.projectid 14/IA/2604 en_US
dc.date.embargoEndDate 2021-03-28
dc.embargo.terms 2021-03-28 en_US
dc.rights.accessrights info:eu-repo/semantics/openAccess en_US
dc.internal.rssid 2903623
dc.internal.copyrightchecked Yes
dc.identifier.journaltitle International Journal Of Plasticity
dc.description.status peer-reviewed


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