Shape Memory Alloys: modeling and applications - unicas.it
Transcript of Shape Memory Alloys: modeling and applications - unicas.it
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Shape Memory Alloys:modeling and applications
Elio SaccoDipartimento di Meccanica, Strutture, A. & T.
University of Cassino
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Ferdinando AuricchioFerdinando Auricchio
J.N.J.N. ReddyReddy
Sonia MarfiaSonia Marfia
Elio SaccoElio Sacco
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• F. Auricchio, E. Sacco Bending of shape-memory-alloy beams. ECCOMAS’96, 1996• F. Auricchio, E. Sacco An integration algorithm for a superelastic shape-memory-alloy model.
Int. Conf. Computational Mechanics, Padova, settembre 1996• F. Auricchio, E. Sacco A SMA thermomechanical finite-element beam model. Shape Memory
and Superelastic Technologies: Engineering and Biomedical Applications, Pacific Grove (U.S.A.) 2-6 March, 1997
• F. Auricchio, E. Sacco A one-dimensional model for superelastic shape-memory alloys with different elastic properties between austenite and martensite. Int. J. Non-Linear Mechanics, vol. 32-6, pp. 1101-1114, 1997
• F. Auricchio, E. Sacco A superelastic shape-memory-alloy beam model. J. Intelligent Material Systems and Structures, vol. 8, pp. 489-501, 1997
• F. Auricchio, E. Sacco Modellazione ed algoritmo di integrazione per leghe a memoria di forma superelastiche. IV Convegno Nazionale AIMAT, Cagliari 8-11 giugno 1998
• F. Auricchio, E. Sacco Shape-memory–alloy linear and angular actuators ICIM Proceedings of the fourth International Conference on intelligent materials, Makuhai, Japan October 5-7 1998
• F. Auricchio, E. Sacco A temperature-dependent beam for shape-memory alloys: constitutive modelling, finite element implementation and numerical simulations. Computer Methods in Applied Mechanics, vol. 174, pp. 171-190, 1999
• F. Auricchio, E. Sacco Modelling of the rate-dependent superelastic behavior of shape-memory alloys. ECCM, August 31-September 3, Munchen, Germany 1999
• F. Auricchio, E. Sacco Thermo-mechanical behavior of a shape-memory alloy beam in the superelastic range ECCOMAS, Barcelona,11-14 September 2000
• F. Auricchio, M. Di Loreto, E. Sacco Finite-element Analysis of StenoticArtery Revascularization Through a Stent Insertion. Computer Methods in Biomechanics and Biomedical Engineering, Vol. 4, pp 249-263, 2001.
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• F. Auricchio, E. Sacco Thermo-mechanical modelling of a superelasticshape-memory wire under cyclic stretching-bending loadings. International Journal of Solids and Structures, vol. 38, pp. 6123-6145, 2001
• F. Auricchio, L. Petrini, R. Pietrabissa, E. Sacco Modeling of shape-memory-alloy orthodonticappliances XV Congresso AIMETA di Meccanica Teorica e Applicata,Taormina, 26-29/09/ 2001
• S. Marfia, E. Sacco Training effects in the modeling of SMA materials. Third Joint Conference of Italian Group of Computational Mechanics and Ibero-Latin America Association of Computational Methods in Engineering, Giulianova (TE), June 24-26, 2002.
• S. Marfia, J.N. Reddy, E. Sacco Laminated SMA beams finite elements, WCCM V Fifth World Congress on Computational Mechanics, Vienna, July 7-12, 2002.
• S. Marfia, J.N. Reddy, E. Sacco, Superelastic and shape memory effects for laminated SMA beams. AIAA Journal, Vol. 41, No.1, pp. 100-109, 2003
• F. Auricchio, L. Petrini, R. Pietrabissa, E. Sacco Numerical modeling of shape memory alloys in orthodontics. Computer Modeling in Engineering and Sciences, Vol. 4, pp. 365-380, 2003.
• F. Auricchio, S. Marfia, E. Sacco Modeling of SMA materials: training and two way memory effects, Computers and Structures, Vol. 81, pp. 2301–2317, 2003.
• S. Marfia, E. Sacco Modeling of fiber reinforced SMA. Composite in Costructions 2003, D. Bruno, G. Spadea, N. Swamy (Eds), Editoriale BIOS, 2003.
• S. Marfia, E. Sacco Micromechanics of fiber reinforced SMA composites. XVI Congresso AIMETA di Meccanica Teorica e Applicata, Ferrara, 9-12 settembre 2003.
• S. Marfia, E. Sacco Micromechanics and homogenization of SMA-wire reinforced materials. J. of Applied Mechanics, Vol. 72, pp. 259-268, 2005.
• S. Marfia, E. Sacco Analysis of SMA composite laminates using a multiscalemodeling technique. Int. J. Numerical Method Engineering. In press 2006.
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Outline of the presentation
• Shape memory alloys behavior and applications
• SE – 1D SMA model• SE – SM 1D thermo-elastic SMA model• SE – SM – TWME 1D SMA model
accounting for training effect• SE – SM 3D SMA model
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Superelastic effect
Mechanical recover
High temperature
SMA behavior and applications
SMA behavior under uniaxial test
Shape memory effect
Thermal recover
Low temperature
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Shape memory alloys (SMA)• reversible changes
of the crystallographic structure, depending on the temperature and on the state of stress:– austenite stable at
high temperature and low stress
– martensite is stable at low temperature and high stress.
• ability to undergo reversible large deformations under loading/thermal cycles
austenite
austenite-martensite
martensite-austenite
martensite
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SMASMAPhasePhasetransformationstransformations
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Martensite Variants►► multimulti--variantvariant MartensiteMartensite►► singlesingle--variantvariant MartensiteMartensite
• Macroscopic deformation(shape deformation)
• Interface(habit plane → invariant plane)
• Homogeneous and lineartransformation
Monocristallo di martensite
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Considered phase trasformations
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Biomedical applications: orthodontic, orthopedic, guide systems, stent, glasses, micro-actuators
Mechanical applications:actuators, thermal valves, connectors, opening and closure systems
Structural applications: vibration control, shape control, dampers
SMA applications
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Superelastic effect
…. SMA applications
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…. SMA applications (surgey)
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Configurazione di uno STENT del tipo Palmaz-Schatz nel catetere di trasporto prima dell’espansione, in una vista 3D.
Analisi agli elementi finiti della rivascolarizzazione di un arteria
stenotica tramite STENT
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After only 3 weeks of therapy !!
…. SMA applications (orthodontic)
Superelastic effect: constant force during the
teeth movement