MATERIAL SELECTION
SELECTION CRITERIA FOR SOCKET
The material selected should be soft, light weight, chemically inactive, have
low coefficient of thermal expansion, easy to use, good corrosion resistance and
cost efficient. Also, the strength factor and modulus of elasticity should be high.
MATERIALS SELECTED
Based on these four materials are selected and they are
 CFRP (Carbon Fibre Reinforced Polymer)
 GFRP (Glass Fibre Reinforced Polymer)
 AFRP (Abaca Fibre Reinforced Polymer)
 PP (Poly Propylene)
These four materials are commonly used in manufacturing of socket. Among
these four materials, the material chosen for socket is CFRP (Carbon Fibre
Reinforced Polymer).
Material
Carbon fiberreinforced
composite
(CFRP),
Glass
fiberreinforced
composite
(GFRP),
Abaca fiberreinforced
composite
(AFRP )
Ultimate
Tensile
Strength
(MPa)
Flexural
Strength
(MPa)
Modulus of
Elasticity
(GPa)
Yield
Strength
(MPa)
481.8
201.5
40.7
36.4
282.3
130.3
11.4
34.3
415.3
42.2
27.3
49.4
Thermoplastic
polypropylene.
33.3
16.7
3.5
153.8
From the table we can infer that CFRC has high strength factor and is relatively
very low cost when compared to other materials listed in the table. Hence CFRC
is very suitable selection for the manufacture of Socket.
SELECTION CRITERIA FOR PYLON
The selection criteria for pylon are that it should have light weight with high
compressive strength and also cost efficient.
MATERIAL SELECTED
The following materials are very common in pylon manufacturing and satisfies
the above said properties. They are
 Ti-6Al-4V
 AL-6061-T6
 SS 304
Material
Ultimate Tensile
Strength (MPa)
Impact
Strength
(MPa)
Modulus of
Elasticity
(GPa)
Compressive
Strength (MPa)
Ti-6Al-4V
215.9
3.9
25.9
862
Al-6061-T6
114.8
9.3
25.6
250
SS 304
63.1
40.6
24.1
205
From the table, it is very clear that titanium has very high compressive strength.
But when it comes to cost titanium costlier than the other. When it comes to cost
Al-6061-T6 alloy stands first as it is comparatively lower than the Ti alloy.
Therefore Al-6061-T6 alloy is chosen as the suitable material for Pylon.
MATERIAL FOR FOOT
The foot designed in this project is called Poly stack foot. The materials chosen
for foot are
 Delrin
 Vulcrepe
Both materials are strong, flexible enough to deform under the loads
experienced by the foot, compressible. When it comes to cost both materials are
very cheap and easily affordable. Therefore, when it comes to the properties,
Delrin is quite flexible when compared to the vulcrepe. Hence Delrin is selected
as a suitable material for foot.