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Engineering Mock Revision (Comparing Mild steel and aluminium when…
Engineering Mock Revision
Metals and their properties
Ferrous Alloys
Cast Iron-good compressive strength, rusts easily, cheap, difficult to machine- used for anvils, engine blocks
Low-Carbon steel- strong, tough, cheap- used for nails and screws, car bodies
High-Carbon Steel- strong and hard, difficult to form, not as tough as low-carbon steel- used for saw blades, hammers and chisels
Stainless Steel- strong and hard, difficult to machine, good corrosion resistance, expensive- used for knives and forks, medical equipment and sinks
Non-Ferrous metals
Brass- corrosion resistant, good conductor of heat/electricity and casts well- used for castings, forgings, ornaments
Aluminium- light,soft,ductile,malleable, good conductor of heat/electricity, corrosion resistant- used for aircraft bodies, saucepans, cooking utensils, foils, cans
Copper- malleable, ductile, tough, good conductor of heat/electricity and easily joined- used for electrical wire, printed circuits
Bronze-tough, hard wearing, corrosion resistant- used for bearings, coins, water valves
Lead-very soft, malleable, heavy, corrosion resistant, low melting point- used for soft solders, roof coverings
Zinc- low melting point, corrosion resistant, easy to work with- used for coating steel, metal dustbins, die casting
Equations
Pressure
Gear ratio
Diameter of driven gear
/ diameter of driver gear
Number of teeth on output gear / number of teeth on input gear
What are composite materials?
Composites are made by combining different types of material to develop combinations of properties that are not possible in individual materials
Comparing Mild steel and aluminium when manufacturing car bodies
Similarities
Both malleable
Both machineable
both weldable
Differences
Aluminium can be formed to make shapes while mild steel cannot
Aluminium is expensive while mild steel is cost effective
Mild steel is heavier and denser
Ease of manufacture
mild steel can be carbonised
both can be welded with ease
aluminium is smeltable meaning that it is easily mass produced
Advantages and disadvantages
Chain and sprocket
It can be noisy and more expensive than a belt and pulley drive system. The chain and sprocket drive does not allow slip.
The chain cannot slip on the sprocket because the sprocket teeth prevent the chain from slipping.
.
Pulley system
Silent in operation.
It provides mechanical advantage while lifting heavy loads.
At acts as a support for long distance moving ropes.
Easy and cheaper to manufacture than gears.
No lubrication required.
