Finite Element Analysis and Experimental Evaluation of Superelastic Nitinol Stent
نویسندگان
چکیده
The mechanical properties of Nitinol stents are normally evaluated experimentally due to complexities resulting from large deformations and material nonlinearity. Despite the difficulties associated with Finite Element Analysis (FEA), the success of the computational analysis in combination with experimental study leads to better understanding of stent performance. This paper presents comparisons between experimentally evaluated radial resistive forces of a Nitinol stent to predictions based on nonlinear FEA. The FEA was performed using ABAQUS with two user material subroutines independently developed specifically for Nitinol. Good agreements between the FEA and the experiments are shown for both user material subroutines.
منابع مشابه
Effects of material properties on mechanical performance of Nitinol stent designed for femoral artery: Finite element analysis
Femoral artery; Nitinol stent; Material properties; Mechanical performance; Finite element analysis. Abstract The Finite element method was used for evaluation of the effects of material properties on the mechanical performance of the new geometry designed for the Z-shaped open-cell femoral artery selfexpanding stent, made of Nitinol wire, by application of crushing force. The behavior of the s...
متن کاملFabrication of Spiral Stent with Superelastic/ Shape Memory Nitinol Alloy for Femoral Vessel
Stent is a metal mesh tube for opening the obstructed vessels of the body. Ni-Ti alloy is a suitable metal for fabrication of stent due to its potential for applying the appropriate stress and strain to the vessel walls. In this study, super-elastic Nitinol wire was used to build stent samples usable to open femoral vessel. Ageing was performed at 500°C for different periods of time to determin...
متن کاملFinite Element Analysis on Nitinol Medical Applications
This article presents two applications of the nonlinear finite element analysis (FEA) using ABAQUS/Standard with a user developed material subroutine Nitinol UMAT from Abaqus West. The analyses are found to agree well with the theoretical prediction and/or experimental measurement. In that first example, FEA predicts the stress-strain response of a superelastic Nitinol device at different Af te...
متن کاملConstitutive modelling and numerical simulation of multivariant phase transformation in superelastic shape-memory alloys
This work concerns the micromechanical constitutive modelling, algorithmic implementation and numerical simulation of polycrystalline superelastic alloys under multiaxial loading. The model is formulated in finite deformations and incorporates the effect of texture. The numerical implementation is based on the constrained minimization of the Helmholtz free energy with dissipation. Simulations a...
متن کاملFatigue-crack propagation in Nitinol, a shape-memory and superelastic endovascular stent material.
Improving the design and performance of medical stents for implantation in the human body is of current interest. This paper describes a study of fatigue-crack propagation behavior in the superelastic alloy Nitinol. Specifically, the objective of this work was to study the effect of environment on cyclic crack-growth resistance in an approximately 50Ni-50Ti (atom %) alloy and to provide the nec...
متن کامل