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dc.contributor.authorSweeney, Caoimhe
dc.contributor.authorMcHugh, Peter
dc.contributor.authorLeen, Sean B.
dc.date.accessioned2015-12-11T13:56:12Z
dc.date.available2015-12-11T13:56:12Z
dc.date.issued2012
dc.identifier.citationSweeney, CA, McHugh, PE, Leen, SB (2012) Micromechanical modelling of fatigue crack nucleation in stents Bioengineering in Ireland 18en_IE
dc.identifier.urihttp://hdl.handle.net/10379/5388
dc.descriptionConference paperen_IE
dc.description.abstractA finite element based micro-mechanical methodology for cyclic plasticity and fatigue crack initiation in cardiovascular stents is presented. The methodology is based on the combined use of a (global) three-dimensional continuum stent-artery model, a local micromechanical stent model, the development of a combined kinematic- isotropic hardening crystal plasticity constitutive formulation, and the application of micro- structure sensitive crack initiation parameters. The methodology is applied to 316L stainless steel stents with random polycrystalline microstructures, based on scanning electron microscopy images of the grain morphology, under realistic elastic-plastic loading histories, including crimp, deployment and in-vivo systolic-diastolic cyclic pressurisation. Identification of the micro- mechanical cyclic plasticity and failure constants is achieved via application of an objective function and a unit cell representative volume element for 316L stainless steel. Cyclic stent deformations are compared with the J2 -predicted response and conventional fatigue life prediction techniques. It is shown that micro- mechanical fatigue analysis of stents is necessary due to the significant predicted effects of material inhomogeneity on micro-plasticity and micro-crack initiation.en_IE
dc.language.isoenen_IE
dc.publisherBioengineering In Ireland Conference 2012en_IE
dc.relation.ispartofBioengineering in Ireland 18en
dc.subjectMicromechanicsen_IE
dc.subjectPlasticityen_IE
dc.subjectCyclic hardeningen_IE
dc.subjectCrack nucleationen_IE
dc.subjectLife predictionen_IE
dc.titleMicromechanical modelling of fatigue crack nucleation in stentsen_IE
dc.typeConference Paperen_IE
dc.date.updated2015-12-07T14:28:41Z
dc.description.peer-reviewednon-peer-reviewed
dc.contributor.funder|~|
dc.internal.rssid10130019
dc.local.contactSean Leen, Mechanical & Biomedical Eng, Eng-2051, New Engineering Building, Nui Galway. 5955 Email: sean.leen@nuigalway.ie
dc.local.copyrightcheckedYes
dc.local.versionPUBLISHED
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