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- in
Economics
see
elasticity
(economics)
- in
Materials
Science the
word
elastomer
refers to a
material which
is very elastic,
like
rubber. The
word elastic
is often used
colloquially to
refer to an
elastomeric
material such as
rubber or
cloth/rubber
combinations.
- holding
things
together,
e.g. with a
rubber band
-
flexibly
moving
something
over a thick
to a thin
part, as in
clothing
put on over
the head,
hips, hands,
feet, and
elastic
necklaces,
bracelets,
watcharmbands.
An
alternative
in many of
these cases
(not for
socks) is a
closing
device such
as
buttons,
a
zipper,
laces,
Velcro,
a
buckle,
a snap
- flexibly
making
airtight or
fluidtight
connections
as in a hose
or condom
- flexibly
cushioning
(a shock
absorber) as
with tires
and for the
soles of
shoes,
and under
the legs of
chairs,
under
vibrating
equipment,
on a door or
door-post,
on bumper
cars, etc.
- flexibly
filling a
volume of
stretchable
material
with gas or
fluids as in
balloons and
for use in
medicine
- for
reducing
downward
speed
gradually as
in
bungee
jumping,
and then
pulling one
up again
- for
accelerating
an object
such as
slingshot,
bow (weapon)
-
- For some
elastic use
applications
a metal
spring
is an
alternative.
-
- In some
of the
materials
applications
the
flexibility
is needed
but not the
elastic
force. In
that case,
when a large
flexibility
is needed
for a large
surface, a
folding wall
is an
alternative
connections
between
railroad
cars and
in
articulated
buses,
and in an
accordion.
- A collision
is perfectly
elastic if
the total
pre-collision
(initial)
kinetic
energy of a
system is equal
to the total
post-collision
(final)
kinetic
energy of the
system. In other
words, a
collision is
perfectly
elastic only so
long as no
kinetic energy
of the objects
within the
system is
converted to
other forms of
energy during
the collision,
such as heat
energy or sound
energy. To date,
no collision has
ever been
observed to be
truly elastic.
Even in the
collision
between two
electrons, which
is the most
elastic
collision
currently known,
an infinitesimal
portion of the
initial kinetic
evergy is
converted to
other forms of
energy.
- A frequent
cause of highly
inelastic
collisions
occurs when one
or more of the
objects suffers
a
plastic
deformation.
- The
deformation of a
solid is part of
the study of
solid mechanics.
In solid
mechanics, a
material behaves
elasticly
if it changes
shape due to an
applied load,
and that when
the load is
removed,
recovers its
original shape.
According to
solid mechanics
theory, every
material will
change shape
when loads are
applied to it
(even very small
loads).
Furthermore,
every material
will undergo
elastic
deformation
as long as the
loads are kept
under a certain
limit. This
limit is known
as the
elastic limit
or the
yield strength
of the material,
and is one way
of defining its
strength.
- For every
material, the
elastic
deformation is
proportional to
the applied
load. The
elasticity
of a solid is
inversely
proportional to
its
stiffness.
Stiffness, when
corrected for
the dimensions
of the solid,
becomes
modulus of
elasticity,
which is an
intensive
property of
the material.
The stiffness of
a structure is
of principle
importance in
many engineering
applications, so
modulus of
elasticity is
often one of the
primary
properties
considered when
selecting a
material. A high
modulus of
elasticity is
most often
sought, because
deflections
are undesirable
under most
conditions.
(Some
applications can
require a
specific amount
of deflection,
however, so the
stiffest
material might
not be the best
one in these
cases.)
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This type of tape is used in
garment production. |
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Search the internet for
additional Textile
&
Clothing definitions and
Glossaries. |
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