MATERIALS

The materials used to manufacture the crane must be strong and resist at the friction and the pressure due to the load.
We have to look for the density, the tensile strength, the yield strength, and the young's modulus of differente materials to help choose which are suitable.
After research we found that Aluminium and Steel are most common materials that can be used in our purpose because of their advantages.
Aluminium: is the most abundant metal to be found in the nature. It is relatively low weigth. Good resistance to corrosion, Good thermal and electrical conductivity. It can be melted, cast, formaed and machined easely.
Young's modulus, 69 GPa
Yield strength, 55 MPa
Tensile strength, 125 MPa
Density, 2.7 Kg/m^3.
Steel:
Low carbon steel( Mild steel) is the most commonly used, readly welded construction material, and has the following typical mechanical properties:
Density, 7.85 Kg/m^3
Yield strength, 250 MPa
Young's modulus, beteen 190 and 210 GPa
Tensile strength, 280 MPa