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15 terms

IB Design Technology Topic 4

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atom
the smallest part of an element that can exist chemically
alloy
mixture that contains at least one metal. This can be a mixture of metals or a mixture of metals and non-metals
molecule
two or more atoms that are normally bonded together covalently
composite
a mixture composed of two or more substances (materials) with one substance acting as the matrix or glue
density
the mass per unit volume of a material
electrical resistivity
this is a measure of a material's ability to conduct electricity. A material with a low resistivity will conduct electricity well
thermal conductivity
a measure of how fast heat is conducted through a slab of material with a given temperature difference across the slab.
thermal expansion
a measure of the degree of increase in dimensions when an object is heated. This can be measured by an increase in length, area or volume. The expansivity can be measured as the fractional increase in dimension per kelvin increase in temperature
hardness
the resistance a material offers to penetration or scratching
tensile strength
the ability of a material to withstand pulling forces
toughness
the ability of a material to resist the propagation of cracks
ductility
the ability of a material to be drawn or extruded into a wire or other extended shape
plastic deformation
the permanent deformation of a solid subjected to a stress
fibre
a class of materials that are continuous filaments or are in discrete elongated pieces, similar to lengths of thread with a length to thickness ratio of at least 80
fibre structure
a filamentous material long in relation to its width/breadth