Submitted by: Submitted by michal
Views: 126
Words: 3809
Pages: 16
Category: Science and Technology
Date Submitted: 10/06/2013 07:23 AM
Shape
memory
alloys
in
civil
structures
Abstract
With
the
development
of
materials
and
technology
and
deteriorating
infrastructures,
many
new
materials
find
their
applications
in
civil
engineering.
Shape
Memory
Alloy
(SMA)
is
a
distinguished
type
of
material
that
can
adapt
and
convert
thermal
energy
directly
into
mechanical
work.
From
the
early
1930s,
Shape
memory
effect
(SME)
for
different
alloys
has
been
documented
leading
to
multiple
commercial
products
in
the
mechanical
and
aerospace
industries.
Nickel-‐Titanium
(Ni-‐Ti)
is
the
most
commonly
used
SMA.
With
two
crystal
structures
called
Austenite
and
Martensite
depending
on
temperature,
SMA
exhibits
two
special
properties
different
from
ordinary
steels.
One
is
shape
memory,
and
the
other
is
super-‐elasticity.
Both
of
these
properties
can
suit
varied
applications
in
civil
engineering,
such
as
pre-‐stress
bars,
self-‐rehabilitation,
isolation,
energy
dissipation,
and
two-‐way
actuators,
etc.
The
objective
of
this
paper
is
to
explore
the
concept
of
smart
material
and
explore
the
mechanical
properties
of
SMA.
The
applications
in
civil
structures
will
also
be
discussed,
including
strengthening,
isolation
and
energy
dissipation.
Finally,
a
case
study
on
a
displacement
control
experiment...