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27 Cards in this Set
- Front
- Back
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Define machinability |
The ability of a material to be machined to a good finish. Good metal Bad rubber unless frozen |
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Ductility |
Its capacity to be permanently deformed without breaking. Good plastic Bad concrete |
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Durability |
Ability of a material to last under environmental or industrial conditions without losing its ability to perform the function it was designed for. Good pastic Bad rubber |
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Wear resistance |
The ability of a material to resist loss of material from its surface, though abrasion, adhesion or corrosion. Good concrete Bad wood |
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Lustre |
Ability to take a polish and reflect color brightly. Good metal Bad rubber |
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Hardenability |
The ease with which a steel can be quenched ro increase its hardness and to what depth good steel bad concrete |
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Thermal conductivity |
The ability of a material to conduct heat good metal eg copper bad wood |
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Weldability |
Ability for a material/ metal to be joined together with the wielding process good metal bad wood |
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Malleability |
Materials ability to be hammered or rolled into other forms good metal eg copper bad wood |
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Electrical conductivity |
Ability of a material to conduct electricity good copper bad concrete |
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Colour |
A way of telling the difference between different materials. It can also be used to tell the temperature of some materials |
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Density |
A measure of the amount of mass a material has per unit of volume High density tungsten low density wood |
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Strength |
Ability to resist failure when a load is applied to itGood metal bar rubber |
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Hardness |
Ability to withstand scratching, wear, abrasion, penetration and plastic deformation Good metal bad wood |
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Surface texture/finish |
Raw characteristics of a given surface. It has three components namely: surface roughness, lay and wariness. It is also known as surface finish |
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Melting point |
Defined as the temperature is which a material moves from its solid state to its liquid state. High melting point austentic stainless steel Low melting point thermoplastic pvc |
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Two main groups of plastic |
Thermoplastics Therosets |
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Where does majority of plastics come from? |
Most plastics comes from petroleum |
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Common uses for plastics |
Bearings Housings Gears Valves |
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Where does metal originate? |
Mined from the ground and processes by heating |
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Define the difference between ferrous and non ferrous metals |
Ferrous metals are based on iron and non-ferrous are made up of metals other than iron |
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Most common metals used in engineering? |
Mild steel Aluminium Copper Brass Austenitic stainless steel |
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Some common uses for Low carbon steel Medium carbon steel High carbon steel |
Lcs gears, bolts, shafts, pins Mcs forgings, leaf springs, hammer heads, axles, wire ropes His files, hand tools, drills, taps and dies |
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What is used to make concrete? |
Cement Water Aggregate |
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Types of concrete |
Plain concrete Reinforced concrete Pre-stressed concrete |
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Common uses for concrete |
House foundations Footpaths Bridges Dams |
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Process for making concrete |
A chemical reaction takes place between water and cement, this solidifies the concrete, hardening and strengthening it over several weeks |
