SHAPE
MEMORY ALLOY
INTRODUCTION
SMA is one of
the smart materials a smart material is defined as one which has multiple
responses to one stimulus in a coordinated manner. External stimulus can be pressure,
load, electrical field or magnetic field. Smartness of the material can be
attributed to the self-adaptability, self sensing, self memory and multiple-functionality.
These smart characteristics provide numerous application in defense,
manufacturing process and bio medical application.
DEFINATION
A shape memory
alloy is an alloy that "remembers" its original shape and that when
deformed return to its pre-deformed shape when heated, this material is light
weight.
Let us we discuss
about the application of SMA-
I explain you
with one example ,Everybody knows
the catheter-
It is a tube and
guide wire which are used for the medical treatment in blood vessel are called
catheter.
Now days we are
using active catheters using shape memory
alloy.
Then you are
thinking what is active catheter-
Catheter based
diagnosis and therapy have become increasingly popular. Conventional catheters
can not move actively and the operations required certain human skill. The tip
of active catheters and active guide wires move actively using shape memory
alloy actuators. Several micro sensor and therapeutic devices have been also
developed for minimally invasive diagnosis and therapy. These devices can be
used in other areas in human body and enables novel diagnosis and therapy.
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