Peer-Reviewed Journal Details
Mandatory Fields
McGarry, JP,O'Donnell, BP,McHugh, PE,McGarry, JG
2004
November
Computational Materials Science
Analysis of the mechanical performance of a cardiovascular stent design based on micromechanical modelling
Published
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Optional Fields
micromechanical modelling finite element method crystal plasticity theory plastic strain localisation coronary stents small scale medical devices MATRIX COMPOSITE-MATERIALS STRESS-STRAIN BEHAVIOR FINITE-ELEMENT-ANALYSIS SHEAR-BAND FORMATION CORONARY STENTS NUMERICAL-SIMULATION SINGLE-CRYSTALS DEFORMATION PLASTICITY
31
421
438
Stents are very commonly used in the treatment of coronary heart disease. They are permanent vascular support structures that offer a preferred alternative to bypass surgery in certain situations. The purpose of this work is to examine the mechanical behaviour of a stainless steel balloon expandable stent design using computational micro-mechanics in the context of the finite element method. Deployment and cardiac pulsing loading conditions are considered. Classical phenomenological plasticity theory (J(2) flow theory) and physically based crystal plasticity theory are used to describe the stent material behaviour. Parametric studies are carried out using both constitutive theories with a view to determining important stent deployment characteristics such as recoil and foreshortening. Comparisons of the results obtained using both theories illustrate differences, with the crystal plasticity theory models showing closer agreement to published performance data. The implications of this for stent design are discussed. (C) 2004 Elsevier B.V. All rights reserved.
DOI 10.1016/j.commatsci.2004.05.001
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