Materials Flashcards
Density is
Mass per unit volume
Melting point
Temp at which a material turns solid to liquid
Thermal conductivity
Ability to conduct heat
Electrical conductivity
Ability to conduct electricity
Strength is
Ability to withstand stress without breaking
Plasticity
Ability to deform when loaded
Malleability
Ability to be shaped under compressive stress (hammering or rolling)
Ductility
Ability to deform under tensile stress (stretched)
Hardness
High resistance to shape change , scratching or cutting
Durability
Ability to withstand demanding applications (eg outside in extreme environments)
Test for Tensile strength
Stretch a material to see how it extends (steel cables in bridge building need high tensile strength)
Testing for hardness
Measure the depth of an indentation left by an indented applied with a specific force
Test for toughness
Measured resistance of materials to break or fracture
Test for ductility
How much a material will deform before breaking (eg a copper wire can be drawn, pulled thinner, before it breaks)
Opaque
Cannot see through it
