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Dynamics of necking and fracture in ductile porous materials

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dc.affiliation.dptoUC3M. Departamento de Mecánica de Medios Continuos y Teoría de Estructurases
dc.affiliation.grupoinvUC3M. Grupo de Investigación: Nonlinear Solid Mechanicses
dc.contributor.authorZheng, Xinzhu
dc.contributor.authorN Souglo, Komi Espoir
dc.contributor.authorRodríguez-Martínez, José A.
dc.contributor.authorSrivastava, Ankit
dc.contributor.funderEuropean Commissionen
dc.date.accessioned2020-02-04T11:25:02Z
dc.date.available2020-02-04T11:25:02Z
dc.date.issued2019-12-23
dc.description.abstractThe onset of necking in dynamically expanding ductile rings is delayed due to the stabilizing effect of inertia, and with increasing expansion velocity, both the number of necks incepted and the number of fragments increase. In general, neck retardation is expected to delay fragmentation as necking is often the precursor to fracture. However, in porous ductile materials, it is possible that fracture can occur without significant necking. Thus, the objective of this work is to unravel the complex interaction of initial porosity and inertia on the onset of necking and fracture. To this end, we have carried out a series of finite element calculations of unit cells with sinusoidal geometric perturbations and varying levels of initial porosity under a wide range of dynamic loading conditions. In the calculations, the material is modeled using a constitutive framework that includes many of the hardening and softening mechanisms that are characteristics of ductile metallic materials, such as strain hardening, strain rate hardening, thermal softening, and damage-induced softening. The contribution of the inertia effect on the loading process is evaluated through a dimensionless parameter that combines the effects of loading rate, material properties, and unit cell size. Our results show that low initial porosity levels favor necking before fracture, and high initial porosity levels favor fracture before necking, especially at high loading rates where inertia effects delay the onset of necking. The finite element results are also compared with the predictions of linear stability analysis of necking instabilities in porous ductile materials.en
dc.description.sponsorshipJ.A.R.-M. acknowledges the financial support provided by the European Research Council under the European Union's Horizon 2020 research and innovation programme (Project PURPOSE, Grant agreement 758056).en
dc.format.extent10es
dc.identifier.bibliographicCitationJournal of applied Mechanics, 87(4), 041005, Apr 2020, 10 pp.en
dc.identifier.doihttps://doi.org/10.1115/1.4045841
dc.identifier.issn0021-8936
dc.identifier.issn1528-9036 (online)
dc.identifier.publicationfirstpage1es
dc.identifier.publicationissue4 (041005)es
dc.identifier.publicationlastpage10es
dc.identifier.publicationtitleJOURNAL OF APPLIED MECHANICS-TRANSACTIONS OF THE ASMEen
dc.identifier.publicationvolume87es
dc.identifier.urihttps://hdl.handle.net/10016/29616
dc.identifier.uxxiAR/0000024301
dc.language.isoengen
dc.publisherASMEen
dc.relation.projectIDinfo:eu-repo/grantAgreement/EC/H2020/758056/PURPOSEen
dc.rights© 2020 by ASME.en
dc.rights.accessRightsopen accessen
dc.subject.ecienciaIngeniería Mecánicaes
dc.subject.otherComputational mechanicsen
dc.subject.otherFailure criteriaen
dc.subject.otherFlow and fractureen
dc.subject.otherMechanical properties of materialsen
dc.subject.otherStructureses
dc.titleDynamics of necking and fracture in ductile porous materialsen
dc.typeresearch article*
dc.type.hasVersionAM*
dspace.entity.typePublication
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