Question

what is the modulus of elasticity (E) of balata belt and shear modulus (G) of balata belt?

Answer 1

Balata:

• belts are similar to rubber belts except that cotton duck impregnated with balata gum instead of rubber.
• These belts are acid and water proof and also don’t get affected by animal oils and alkalis but get seriously affected by the mineral oils.
• Balata belts have 20-40% higher strength than the rubber belts.
• Balata starts softening and becomes sticky at temperatures above 40°C. So these are not recommended for high temperature applications.
• The strength of balata belts is 25per cent higher than rubber belts.

Properties

Density = 1110 Kg/m^3

Young's modulus =36.86 MPa

Poisson ratio , μ =0.49

E = 2G (1+ μ )

G = E/(2*(1+ μ ))

Shear modulus = (36.86/(2*(1+0.49))

Shear modulus,G = 12.37 MPa