Modeling of strengthening and softening in inelastic nanocrystalline materials with reference to the triple junction and grain boundaries using strain gradient plasticity

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dc.authoridVoyiadjis, George/0000-0002-7965-6592
dc.contributor.authorVoyiadjis, George Z.
dc.contributor.authorDeliktas, Babur
dc.date.accessioned2024-09-18T21:01:39Z
dc.date.available2024-09-18T21:01:39Z
dc.date.issued2010
dc.departmentHatay Mustafa Kemal Üniversitesien_US
dc.description1st Conference of the American-Academy-of-Mechanics -- JUN, 2008 -- New Orleans, LAen_US
dc.description.abstractThe work presented here provides a generalized structure for modeling polycrystals from micro- to nano-size range. The polycrystal structure is defined in terms of the grain core, the grain boundary and the triple junction regions with their corresponding volume fractions. Depending on the size of the crystal from micro to nano, different types of analyses are used for the respective different regions of the polycrystal. The analyses encompass local and nonlocal continuum or crystal plasticity. Depending on the physics of the region dislocation-based inelastic deformation and/or slip/separation is used to characterize the behavior of the material. The analyses incorporate interfacial energy with grain boundary sliding and grain boundary separation. Certain state variables are appropriately decomposed into energetic and dissipative components to accurately describe the size effects. This new formulation does not only provide the internal interface energies but also introduces two additional internal state variables for the internal surfaces (contact surfaces). One of these new state variables measures tangential sliding between the grain boundaries and the other measures the respective separation. Additional entropy production is introduced due to the internal subsurface and contacting surface. A multilevel Mori-Tanaka averaging scheme is introduced in order to obtain the effective properties of the heterogeneous crystalline structure and to predict the inelastic response of a nanocrystalline material. The inverse Hall-Petch effect is also demonstrated. The formulation presented here is more general, and it is not limited to either polycrystalline- or nanocrystalline-structured materials. However, for more elaborate solution of problems, a finite element approach needs to be developed.en_US
dc.description.sponsorshipAmer Acad Mechanen_US
dc.identifier.doi10.1007/s00707-010-0338-1
dc.identifier.endpage26en_US
dc.identifier.issn0001-5970
dc.identifier.issn1619-6937
dc.identifier.issue1-2en_US
dc.identifier.scopus2-s2.0-77954955313en_US
dc.identifier.scopusqualityQ2en_US
dc.identifier.startpage3en_US
dc.identifier.urihttps://doi.org/10.1007/s00707-010-0338-1
dc.identifier.urihttps://hdl.handle.net/20.500.12483/12911
dc.identifier.volume213en_US
dc.identifier.wosWOS:000280087100002en_US
dc.identifier.wosqualityQ3en_US
dc.indekslendigikaynakWeb of Scienceen_US
dc.indekslendigikaynakScopusen_US
dc.language.isoenen_US
dc.publisherSpringer Wienen_US
dc.relation.ispartofActa Mechanicaen_US
dc.relation.publicationcategoryKonferans Öğesi - Uluslararası - Kurum Öğretim Elemanıen_US
dc.rightsinfo:eu-repo/semantics/closedAccessen_US
dc.subjectDiffusion-Controlled Creepen_US
dc.subjectHall-Petch Relationshipen_US
dc.subjectMechanical-Propertiesen_US
dc.subjectYield-Stressen_US
dc.subjectPart Ien_US
dc.subjectSizeen_US
dc.subjectDeformationen_US
dc.subjectBehavioren_US
dc.subjectMetalsen_US
dc.subjectThermodynamicsen_US
dc.titleModeling of strengthening and softening in inelastic nanocrystalline materials with reference to the triple junction and grain boundaries using strain gradient plasticityen_US
dc.typeConference Objecten_US

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