The Micro-macroscale Correlation Of NiTi
Mechanical Behavior: A Finite Element Analysis
Author(s)
F. M. Weafer & M. S. Bruzzi
Abstract
One material that has found particular favor for use in biomedical endovascular
stents is the near equi-atomic NiTi alloy, Nitinol. One remarkable trait exhibited
by this superelastic material is the improvement of its fatigue performance with
increasing mean strain [1, 2]. Clarification into this phenomenon still remains
incomplete in literature. This study proposes a microstructural explanation for
this unique macroscopic behavior; it is hypothesized stress-induced martensite
(SIM) will stabilize with increasing strain which, in turn, leads to the observed
increase in fatigue life. Finite Element Analysis (FEA) is employed to
investigate the behavior of a ‘v-strut’ stent subcomponent under various strain
levels. The volume fraction of SIM is analyzed to identify its potential influence
on macroscopic response and, ultimately, fatigue behavior. In addition, a
computational investigation is performed on the effect of crystallographic texture
on macroscopic response. Granular transformational behavior is analyzed using
FEA models with realistic and idealized grain structures, specifically evaluating
the effect of individual grain orientations on the stress-induced martensite
transformation (SIMT).
Keywords: Nitinol, microstructure, superelasticity, fatigue.
Keywords
Nitinol, microstructure, superelasticity, fatigue
Related Book
Other papers in this volume
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