1. www.studymafia.org Seminar On Smart material
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2. content Introduction Operation principle Types of SMA
Economical Outlook
Applications
References

3. introduction
Smart materials are designed materials that have one or more properties that can be significantly changed in a controlled fashion by external stimuli, such as stress, temperature, moisture, electric or magnetic fields.
Types of Smart material:
Shape memory alloy
Piezoelectric
Thermoelectric materials
Thermochromic
Photochromic, etc.

4. SMA
SMA are the Materials which have the ability to return to a predetermined shape when heated or cooled, or below its transformation temperature.
When it is heated above its transformation temperature it undergoes a change in crystal structure which causes it to return to its original shape.
The most common shape memory material is an alloy of nickel and titanium called Nitinol
This particular alloy has very good electrical and mechanical properties, long fatigue life, and high corrosion resistance.

5. Operation principle SMA has two stable phases
1) Austenite (high temperature phase)
2) Martensite (low temperature phase)
Fig. 1: Different phases of a shape memory alloy

6. Contd…
(a) (b)
Fig. 2: (a)Temperature-induced phase transformation of a shape memory alloy without mechanical loading. (b) hysteresis curve

7. types Types of SMA Types of Alloys One way SMA
Cu-Al-Ni Alloy, Ti51Ni49
Two way SMA
Types of Alloys
Ni-Ti
Copper

8. nitinol
The term nitinol is derived from its composition and its place of discovery: (Nickel Titanium-Naval Ordnance Laboratory).
Nitinol is actuator, sensor and heater all in one material
Nitinol thin film actuators have attracted significant development efforts in the recent past years.
Nitinol films normally less than 10m in thickness were deposited on silicon, glass or polymeric substrates by sputter deposition.

9. ECONOMICAL OUTLOOK 1 Billion dollar market 75% - Electro-ceramics
10% -Shape Memory Materials
10% - Magnetostrictive materials
5% - Active Fluids

10. application MEMS electrical & thermal Actuator Micro-grippers
Aerospace and Naval Applications
Medical
Dentistry
Repair broken bones
Replace damage discs
Cellular phones
Robotics arm
Fire alarm sensor
Arts

11. References www.google.com www.wikipedia.com www.studymafia.org

12. Thank you