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Finite-element modelling of NiTi shape-memory wires for morphing aerofoils

Wan A Hamid, Wan Luqman Hakim and Lannucci, Lorenzo and Robinson, Paul (2020) Finite-element modelling of NiTi shape-memory wires for morphing aerofoils. The Aeronautical Journal, 124 (1281). pp. 1740-1760. ISSN 0001-9240 E-ISSN 2059-6464

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This paper presents the development and implementation of a user-defined material (UMAT) model for NiTi Shape-Memory Alloy (SMA) wires for use in LS-DYNA commercial explicit finite-element analysis software. The UMAT focusses on the Shape-Memory Effect (SME), which could be used for actuation of aerostructural components. The actuation of a fundamental structure consisting of an SMA wire connected in series with a linear spring was studied first. The SMA thermomechanical behaviour obtained from the finite-element simulation was compared with that obtained from the analytical solution in MATLAB. A further comparison is presented for an SMA-actuated cantilever beam, showing excellent agreement in terms of the SMA stress and strain as well as the tip deflection of the cantilever beam. A mesh sensitivity study on the SMA wire indicated that one beam element was adequate to accurately predict the SMA thermomechanical behaviour. An analysis of several key parameters showed that, to achieve a high recovery strain, the stiffness of the actuated structure should be minimised while the cross-sectional area of the SMA wire should be maximised. The actuation of an SMA wire under a constant stress/load was also analysed. The SMA material model was finally applied to the design of morphing aluminium and composite aerofoils consisting of corrugated sections, resulting in the prediction of reasonably large trailing-edge deflections (7.8–65.9 mm).

Item Type: Article (Journal)
Uncontrolled Keywords: Shape-memory alloy (SMA), shape-memory effect, UMAT, LS-DYNA, morphing structures.
Subjects: T Technology > TL Motor vehicles. Aeronautics. Astronautics > TL500 Aeronautics
Kulliyyahs/Centres/Divisions/Institutes (Can select more than one option. Press CONTROL button): Kulliyyah of Engineering > Department of Mechanical Engineering
Depositing User: Dr. Wan Luqman Hakim Wan Abdul Hamid
Date Deposited: 28 Jul 2021 10:10
Last Modified: 28 Jul 2021 10:10
URI: http://irep.iium.edu.my/id/eprint/91087

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