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A strain-mediated corrosion model for bioabsorbable metallic stents.
Galvin, E; O'Brien, D; Cummins, C; Mac Donald, B J; Lally, C.
Afiliación
  • Galvin E; School of Mechanical and Manufacturing Engineering, Dublin City University, Dublin 9, Ireland. Electronic address: emmet.galvin3@mail.dcu.ie.
  • O'Brien D; School of Mechanical and Manufacturing Engineering, Dublin City University, Dublin 9, Ireland.
  • Cummins C; Vasorum Ltd., 2012 Orchard Avenue, Citywest Campus, Dublin 24, Ireland.
  • Mac Donald BJ; School of Mechanical and Manufacturing Engineering, Dublin City University, Dublin 9, Ireland.
  • Lally C; Department of Mechanical and Manufacturing Engineering, School of Engineering and Trinity Centre For Bioengineering, Trinity Biomedical Sciences Institute, Trinity College Dublin, The University of Dublin, Dublin 2, Ireland. Electronic address: lallyca@tcd.ie.
Acta Biomater ; 55: 505-517, 2017 06.
Article en En | MEDLINE | ID: mdl-28433790
This paper presents a strain-mediated phenomenological corrosion model, based on the discrete finite element modelling method which was developed for use with the ANSYS Implicit finite element code. The corrosion model was calibrated from experimental data and used to simulate the corrosion performance of a WE43 magnesium alloy stent. The model was found to be capable of predicting the experimentally observed plastic strain-mediated mass loss profile. The non-linear plastic strain model, extrapolated from the experimental data, was also found to adequately capture the corrosion-induced reduction in the radial stiffness of the stent over time. The model developed will help direct future design efforts towards the minimisation of plastic strain during device manufacture, deployment and in-service, in order to reduce corrosion rates and prolong the mechanical integrity of magnesium devices. STATEMENT OF SIGNIFICANCE: The need for corrosion models that explore the interaction of strain with corrosion damage has been recognised as one of the current challenges in degradable material modelling (Gastaldi et al., 2011). A finite element based plastic strain-mediated phenomenological corrosion model was developed in this work and was calibrated based on the results of the corrosion experiments. It was found to be capable of predicting the experimentally observed plastic strain-mediated mass loss profile and the corrosion-induced reduction in the radial stiffness of the stent over time. To the author's knowledge, the results presented here represent the first experimental calibration of a plastic strain-mediated corrosion model of a corroding magnesium stent.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Estrés Mecánico / Stents / Implantes Absorbibles / Aleaciones / Magnesio Tipo de estudio: Prognostic_studies / Qualitative_research Idioma: En Revista: Acta Biomater Año: 2017 Tipo del documento: Article Pais de publicación: Reino Unido
Texto completo
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Estrés Mecánico / Stents / Implantes Absorbibles / Aleaciones / Magnesio Tipo de estudio: Prognostic_studies / Qualitative_research Idioma: En Revista: Acta Biomater Año: 2017 Tipo del documento: Article Pais de publicación: Reino Unido