The pads are 200mm long, 150 mm wide and thickness equal to 12mm. 1 - Determine the average shear strain in the rubber if the force P = 15 kN and the shear modulus for the rubber is G = 830 kPa. 2 - What is the relative horizontal displacement between the interior plate and the outer plates Esteel = 200 GPa Gste

a) 0.3

b) 3.6 mm

Explanation:

Given

Length of the pads, l = 200 mm = 0.2 m

Width of the pads, b = 150 mm = 0.15 m

Thickness of the pads, t = 12 mm = 0.012 m

Force on the rubber, P = 15 kN

Shear modulus on the rubber, G = 830 GPa

The average shear strain can be gotten by

τ (average) = (P/2) / bl

τ (average) = (15/2) / (0.15 * 0.2)

τ (average) = 7.5 / 0.03

τ (average) = 250 kPa

γ (average) = τ (average) / G

γ (average) = 250 kPa / 830 kPa

γ (average) = 0.3

horizontal displacement,

δ = γ (average) * t

δ = 0.3 * 12

δ = 3.6 mm