Instabilities of High Speed Dislocations.

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cam.issuedOnline2018-10-02
dc.contributor.authorVerschueren, J
dc.contributor.authorGurrutxaga-Lerma, B
dc.contributor.authorBalint, DS
dc.contributor.authorSutton, AP
dc.contributor.authorDini, D
dc.contributor.orcidDini, D [0000-0002-5518-499X]
dc.date.accessioned2018-12-01T00:31:18Z
dc.date.available2018-12-01T00:31:18Z
dc.date.issued2018-10-05
dc.description.abstractDespite numerous theoretical models and simulation results, a clear physical picture of dislocations traveling at velocities comparable to the speed of sound in the medium remains elusive. Using two complementary atomistic methods to model uniformly moving screw dislocations, lattice dynamics and molecular dynamics, the existence of mechanical instabilities in the system is shown. These instabilities are found at material-dependent velocities far below the speed of sound. We show that these are the onset of an atomistic kinematic generation mechanism, which ultimately results in an avalanche of further dislocations. This homogeneous nucleation mechanism, observed but never fully explained before, is relevant in moderate and high strain rate phenomena including adiabatic shear banding, dynamic fracture, and shock loading. In principle, these mechanical instabilities do not prevent supersonic motion of dislocations.
dc.format.mediumPrint
dc.identifier.doi10.17863/CAM.33528
dc.identifier.eissn1079-7114
dc.identifier.issn0031-9007
dc.identifier.urihttps://www.repository.cam.ac.uk/handle/1810/286218
dc.languageeng
dc.publisherAmerican Physical Society (APS)
dc.publisher.urlhttp://dx.doi.org/10.1103/physrevlett.121.145502
dc.rightsAttribution 4.0 International
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.subject0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics
dc.subjectBioengineering
dc.titleInstabilities of High Speed Dislocations.
dc.typeArticle
dcterms.dateAccepted2018-09-11
prism.issueIdentifier14
prism.publicationDate2018
prism.publicationNamePhys Rev Lett
prism.startingPage145502
prism.volume121
rioxxterms.licenseref.startdate2018-10
rioxxterms.licenseref.urihttp://www.rioxx.net/licenses/all-rights-reserved
rioxxterms.typeJournal Article/Review
rioxxterms.versionVoR
rioxxterms.versionofrecord10.1103/PhysRevLett.121.145502
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