Numerical modelling of intergranular fracture in polycrystalline materials and grain size effects

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dc.identifier.uri http://dx.doi.org/10.15488/5025
dc.identifier.uri https://www.repo.uni-hannover.de/handle/123456789/5069
dc.contributor.author Paggi, Marco
dc.contributor.author Wriggers, Peter
dc.date.accessioned 2019-06-26T12:57:09Z
dc.date.available 2019-06-26T12:57:09Z
dc.date.issued 2011
dc.identifier.citation Paggi, Marco; Wriggers, Peter: Numerical modelling of intergranular fracture in polycrystalline materials and grain size effects. In: Fracture and Structural Integrity 5 (2011), Nr. 17, S. 5-14. DOI: https://doi.org/10.3221/igf-esis.17.01
dc.description.abstract In this paper, the phenomenon of intergranular fracture in polycrystalline materials is investigated using a nonlinear fracture mechanics approach. The nonlocal cohesive zone model (CZM) for finite thickness interfaces recently proposed by the present authors is used to describe the phenomenon of grain boundary separation. From the modelling point of view, considering the dependency of the grain boundary thickness on the grain size observed in polycrystals, a distribution of interface thicknesses is obtained. Since the shape and the parameters of the nonlocal CZM depend on the interface thickness, a distribution of interface fracture energies is obtained as a consequence of the randomness of the material microstructure. Using these data, fracture mechanics simulations are performed and the homogenized stress-strain curves of 2D representative volume elements (RVEs) are computed. Failure is the result of a diffuse microcrack pattern leading to a main macroscopic crack after coalescence, in good agreement with the experimental observation. Finally, testing microstructures characterized by different average grain sizes, the computed peak stresses are found to be dependent on the grain size, in agreement with the trend expected according to the Hall-Petch law. eng
dc.language.iso eng
dc.publisher Cassino : Gruppo Italiano Frattura
dc.relation.ispartofseries Fracture and Structural Integrity 5 (2011), Nr. 17
dc.rights CC BY 4.0 Unported
dc.rights.uri https://creativecommons.org/licenses/by/4.0/
dc.subject Crystallite eng
dc.subject Computational chemistry eng
dc.subject Grain size eng
dc.subject Materials science eng
dc.subject Intergranular fracture eng
dc.subject Grain boundary eng
dc.subject Phenomenon eng
dc.subject Cohesive zone model eng
dc.subject Fracture mechanics eng
dc.subject Crystallography eng
dc.subject Grain boundary strengthening eng
dc.subject.ddc 620 | Ingenieurwissenschaften und Maschinenbau ger
dc.title Numerical modelling of intergranular fracture in polycrystalline materials and grain size effects
dc.type article
dc.type Text
dc.relation.essn 1971-8993
dc.relation.doi https://doi.org/10.3221/igf-esis.17.01
dc.bibliographicCitation.issue 17
dc.bibliographicCitation.volume 5
dc.bibliographicCitation.firstPage 5
dc.bibliographicCitation.lastPage 14
dc.description.version publishedVersion
tib.accessRights frei zug�nglich


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