Show simple item record

dc.contributor.authorSweeney, Caoimhe
dc.contributor.authorMcHugh, Peter
dc.contributor.authorLeen, Sean B.
dc.identifier.citationSweeney, CA, McHugh, PE, Leen, SB (2012) Micromechanical modelling of fatigue crack nucleation in stents Bioengineering in Ireland 18en_IE
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.publisherBioengineering In Ireland Conference 2012en_IE
dc.relation.ispartofBioengineering in Ireland 18en
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.local.contactSean Leen, Mechanical & Biomedical Eng, Eng-2051, New Engineering Building, Nui Galway. 5955 Email:

Files in this item

Attribution-NonCommercial-NoDerivs 3.0 Ireland
This item is available under the Attribution-NonCommercial-NoDerivs 3.0 Ireland. No item may be reproduced for commercial purposes. Please refer to the publisher's URL where this is made available, or to notes contained in the item itself. Other terms may apply.

The following license files are associated with this item:


This item appears in the following Collection(s)

Show simple item record