properites definitions_filled inx - Technology NZ

quartzaardvarkΠολεοδομικά Έργα

29 Νοε 2013 (πριν από 3 χρόνια και 7 μήνες)

56 εμφανίσεις


Lesley Pearce team Solutions. National Coordinator Technology. Auckland University

Pair definitions

Properties of materials


Key Words

Definitions

Words



mallability



This is the ability of the shape of the material to be
altered in any direction by compressive forces such as
hammering, pressing rolling or bending without
RUPTURING. Usually sheet material. Malleable materials
need not be strong but they must be highly plastic.




plasticity



When some materials are subjected to forces, they
permanently change shape. Plasticity is the ability of
materials not to permanentl
y change shape. Some
materials become plastic if they are overloaded and
remain in the changed shape.




viscosity



The state of being thick, sticky, and semifluid in
consistency, due to internal friction.



Compression




All materials can be compressed by pushing at both ends.
Concrete is used for building as it has high compressive
strength. Concrete has no tensile strength so when it is
used for beams and floors, steel reinforcing bars must be
added to take the loads. Ma
terials BUCKLE when they fail
under Compression.






Thermal conductivity





If heat can flow through it easily



Lesley Pearce team Solutions. National Coordinator Technology. Auckland University


Pair definitions

Properties of materials


Key Words

Definitions

Words



Tensile strength


the maximum
stress

that a material can withstand while
being stretched
/
measures the
force

required to pull
something such as
rope
,
wire
, or a structural beam to the
point where it breaks



Elasticity




When material
s are subjected to forces they will change
shape. To be elastic, the material must return to its
original shape when the load is removed. Most materials
are safe to use in their elastic state. A spring has to be
very elastic to work. An eraser is elastic u
p until it
breaks.



ductility




This is the ability of a material to be stretched into long
thin shapes reducing its cross sectional area. Copper has
this ability and is used to make different sized wires by a
process called Cold Drawing. Ductile
materials must be
highly plastic. Plasticine is a malleable material as can be
rolled out but it is not ductile as it easily tears apart
when stretched.




toughness



This is the ability of a material to withstand sudden
impact loads without failing, ie.

hammering,. Materials
that are
……..

will⁷ th獴and⁢ending⁡ d⁳he慲楮g
睩whout⁣牡捫rng.




deg牡摡rility




the⁳t慴e ⁱualit礠o映being⁳u獣数sible⁴o⁢牥慫do睮w
de捯浰o獩tion.


degradable