properties of materials : metals and polymers Flashcards
Thermoforming definition?
Plastic materials are materials that can be repeatedly softened by heat and formed into shapes which become hard when cooled.
Thermosetting definition?
Plastic materials are materials that can be softened and formed into shapes which become hard when cooled and cannot be softened again
elastic state definition?
The state in which a thermoforming polymer is at a temperature that produces a stretchy consistency and in which it can be shaped, but will not retain its form without being held in place.
( line bending, vacuum forming, dome blowing)
plastic state definition?
the state in which a thermoforming polymer is at a temperature that produces a consistency that is softer and more malleable than the elastic state.
( injection moulding)
properties of thermoforming polymers?
Thermo performance and stability.
Resistance to heat and corrosion.
Superior hardness.
Comprehensive strength.
Excellent moldability can retain a greater degree of physical detail.
properties of thermosetting polymers?
Un - Recyclable
Cannot turn back to liquid
high strength
properties of thermosetting polymers?
Un - Recyclable
Cannot turn back to liquid
high strength
ferrous metals definition?
a metal that contains iron and which will rust unless it’s protected e.g - painting
non - ferrous metals definition?
metals that do not contain iron and therefore don’t rust
alloy definition?
a metallic material that is a mixture of two metals
Name all 7 properties of metals:
Brittleness
Ductility
Hardness
Elasticity
Malleability
Toughness
Work hardening
Brittleness definition?
something that has no flexibility: when it breaks, it shatters into multiple pieces
Ductility definition?
the ability to be stretched, bent, deformed and shaped without breaking
Hardness definition?
resistance to scratching, cutting and wear
Elasticity definition?
the ability to return to its original shape after it has been deformed
