SMA bellows as reversible thermal sensors/actuators
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AbstractIn this paper, the feasibility of reversible bellows made of shape memory alloys (SMAs) in sensory and actuated applications to transfer pressure and/or temperature into a linear motion is investigated. An analytical three-dimensional model is developed to simulate key features of SMAs including martensitic transformation, reorientation of martensite variants, the shape memory effect, and pseudo-elasticity. Axisymmetric two-dimensional theory of thermo-inelasticity based on the non-linear Green-Lagrange strain tensor is employed to derive the equilibrium equations. A finite element method along with an iterative incremental elastic-predictor-inelastic-corrector procedure is developed to solve the governing equations with both material and geometrical non-linearities. The feasibility of reversible SMA bellows in transferring pressure and/or temperature into a linear motion is numerically demonstrated. In this respect, the effects of geometric parameters, magnitude of thermo-mechanical loadings and end conditions on the performances of SMA bellows are evaluated and discussed in depth. This study provides pertinent results toward an efficient and reliable design of reversible thermally-driven SMA bellows.
All Author(s) ListDamanpack A.R., Bodaghi M., Liao W.H.
Journal nameSmart Materials and Structures
Volume Number24
Issue Number6
PublisherInstitute of Physics Publishing
Place of PublicationUnited Kingdom
LanguagesEnglish-United Kingdom
Keywordsbellows, martensitic transformation, reversible thermally-driven sensors/actuators, shape memory alloys

Last updated on 2020-19-11 at 01:39