SMART MATERIALS. Introduction:- Nature is full of magic materials. Nature is full of magic materials. Smart materials can sense, stimulate, process and.

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Presentation transcript:

SMART MATERIALS

Introduction:- Nature is full of magic materials. Nature is full of magic materials. Smart materials can sense, stimulate, process and actuate a response. Smart materials can sense, stimulate, process and actuate a response. the properties can be easily altered. the properties can be easily altered.

Shape memory alloys (SMA’s):- Metals which exhibit 2 unique properties: (1) Pseudo-elasticity. (2) Shape Memory Effect.

Working of SMA’s:- The properties are due to the solid state phase change. There are two phases:- (1) Marten site and (2) Austenite.

Marten site is relatively soft and exist at low temp’s The molecular structure is as below:

► Austenite is the stronger phase, occurs at high temp’s. ► Cubic structure.

Shape Memory Effect:- The un-deformed marten site and the austenite have same size and shape. Shape memory effect is absorbed when it is cooled down to less than M f.

Pseudo Elasticity:- It occurs in the alloys which completely consists of Austenite. It occurs without a change in temperature. Applications of pseudo elasticity: (1) eyeglass frames. (2) orthodontic arches.

Applications of shape memory alloys:-  I I I In air craft maneuverability.

 In Robotic muscles:

Points of consideration:- (1) The method of controlling movement with the limb. (2) Emulating real human movements. (3) The gripping force required to hold any object.

 Creating human motion using SMA wires is a complex task.  The wire is heated by passing the current through it.

 In Bone plates:

advantages of sma:- advantages of sma:- Bio-compact ability Bio-compact ability Good Mechanical properties. Good Mechanical properties. dis-advantages of sma:- dis-advantages of sma:-  These alloys are expensive.  poor fatigue properties

Conclusion:- ►T►T►T►The SMA’s have a major say in the field of precision engineering. ►T►T►T►These play a vital role in the surgical operations. ►T►T►T►These act as best alternatives in the field of manufacturing.

References:- o Material Science and Manufacturing by M.Moallem. o Material Science and Engineering by K.M.Guptha, Umesh Publications. o Elements of Material Science and Engineering by Van vik / Adison Wesley.