STP1481

    Experimental Studies of NiTi Self-Expanding Stent Designs

    Published: Jan 2007


      Format Pages Price  
    PDF Version (2.6M) 12 $25   ADD TO CART
    Complete Source PDF (27M) 12 $55   ADD TO CART


    Abstract

    Preliminary investigations to apply thermoelastic stress analysis (TSA) to Nitinol selfexpanding stents are described. Tests conducted at high resolution indicated that a viable thermoelastic signal can be obtained from the fine stent structure. It is shown that it is possible to digitally compensate for errors arising from motion at this high resolution. High variability in Nitinol's material properties with stress and temperature result in a complex thermoelastic response. Correction strategies are proposed to account for variation in material properties and to minimize errors due to thermal variations in order to derive calibration factors for the austenite and martensite material phases. The greatest challenge is identified as calibrating the thermoelastic response from the radially loaded stent structure where it is likely the material is highly inhomogeneous.

    Keywords:

    Nitinol, thermoelastic stress analysis, stent


    Author Information:

    Eaton-Evans, J.
    Research Student and Professor, Department of Mechanical and Aeronautical Engineering, University of Limerick,

    Dulieu-Barton, J. M.
    Reader in Experimental Mechanics, School of Engineering Sciences, University of Southampton,

    Little, E. G.
    Research Student and Professor, Department of Mechanical and Aeronautical Engineering, University of Limerick,

    Brown, I. A.
    Research Student and Professor, Department of Mechanical and Aeronautical Engineering, University of Limerick,


    Paper ID: STP45243S

    Committee/Subcommittee: F04.33

    DOI: 10.1520/STP45243S


    CrossRef ASTM International is a member of CrossRef.