Shape Memory Alloy ppt
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SHAPE MEMORY ALLOY
(SMA)PRESENTED BY:- GUIDED BY:SAMBHRANT KESHARI BAL PROF. JYOTI RANJAN BARIK
REGD.NO:1201298410 DEPARTMENT OF MECHANICAL
ENGINEERING
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CONTENTSNAME
1.HISTORY OF SMA2.INTRODUCTION
3.SCHEMATIC DIAGRAM UNDER TEMPERATURE 4.SUPERELASTIC SMAS 5.SHAPE MEMORY ALLOYS : MODELING
6.APPLICATIONS 7.FUTURE APPLICATIONS OF SMA 8.ADVANTAGES 9.DISADVANTAGES 10.CONCLUSION
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1.HISTORY OF SMA
SMAs were first discovered in 1951 Further publicized after the discovery of Ni-
Ti alloy in 1963SMAs have two main phases: Austenite and
Martensite Austenite phase is Symmetric,while
martensite phase is less symmetricPhase transformation occur either thermally
of mechanically
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2.INTRODUCTIONShape Memory Alloys (SMAs) are a
unique class of metal alloys that can recover apparent permanent strains when they are heated above a certain temperature.
The SMAs have two stable phases - the high-temperature phase, called austenite and the low-temperature phase, called martensite
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3.SCHEMATIC DIAGRAM UNDER TEMPERATURE
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4.SUPERELASTIC SMAsSuper elastic SMAs are
characterized by:1) Excellent recentering capability2) Controlled level of force at
moderate strain levels3) Strain hardening at large strain
levels4) Hysteretic energy dissipation5) Excellent corrosion resistance6) High fatigue strength
Casati, R., Passaretti, F., & Tuissi, A. (2011). Effect of electrical heating conditions on functional fatigue .
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5.SHAPE MEMORY ALLOYS : MODELING
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6.Applications:
Various thermal actuators then came into existence as a part of electric appliances and automobile engineering.
AutomobileAerospace applicationBio medicalCivil engineering of Mega structures
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7.FUTURE APPLICATIONS OF SMAEliminate vibrations of read/write heads in hard disk drivesMicrostents
Promote flow in tubular passages Reinforce weak blood vessels
Microsurgery Cardiovascular applications Orthopedic applications
microstents
Simon filter
Micro wrapper
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8. ADVANTAGES• High strength • Good elasticity• Fatigue Resistance• Wear resistance• Easy fabrication• Easy to sterilize• High Power/weight ratio• Light weight• Shape memory
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Cont...Grab tiny foreign objects for removal from the body
Facilitates access to intricate regions of the bodyMicro assembly for MEMS devicesIntravascular Therapy
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9.DISADVANTAGES OF SMAs
The main disadvantages of SMA’s are:Initial ExpensiveSensitivity of material properties in fabrication.Residual Stress’s developed in thin films.Nonlinearity of actuation force.Lower maximum frequency compared to other
micro actuator devices.• Poor fatigue Property.
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REFERENCE
Casati, R., Passaretti, F., & Tuissi, A. (2011). Effect of electrical heating conditions on functional fatigue of thin NiTi wire for shape memory actuators Retrieved 06 2011, from ScienceDirect: http://www.sciencedirect.com/
de Haan, J. (1994, juli). Geheugenwerking bij NiTi-legeringen. Retrieved 06 2011, from alexandria.tue.nl: http://alexandria.tue.nl/repository/books/642146.pdf
Detailed Introduction to Shape Memory Alloys. (n.d.). Retrieved 06 2011, from smart.tamu.edu: http://smart.tamu.edu/overview/smaintro/detailed/detailed.html
Djavareshkian, M., Esmaeli, A., & Parsani, A. (2011). Aerodynamics of smart flap under ground effect Retrieved 07 2011, from ScienceDirect: http://www.sciencedirect.com
Kanada, T. (2008, 05 05). A new drive system using a shape memory alloy (SMA). Retrieved 06 2011, from joam.inoe.ro/download.php?idu=1360
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