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3 November, 14:40

Two blocks of rubber, each of width w = 60 mm, are bonded to rigid supports and to the movable plate AB. Knowing that a force of magnitude P = 19 kN causes a deflection δ = 3 mm of plate AB, determine the modulus of rigidity of the rubber used.

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  1. 3 November, 15:00
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    Answer: modulus of rigidity of the rubber used = 12.6*10⁶ Pa or 12.6 MPa

    The dimension of the rubber for the cross sectional area were not provided therefore I have considered them to be as 150 mm (0.15) & 100 mm (0.1 mm)

    Explanation: Force exerted by the rubber blocks = (1/2) * P

    = 0.5 * 19 * 1000 N

    = 9.5*10³ N

    Shear Stress τ = (9.5*10³ N) / (0.15 m * 0.10 m)

    = 6.33*10⁵ Pa

    The deflection given is δ=3 mm and w = 60 mm

    γ = δ/w = (3*10⁻³ m) / (0.06 m)

    = 0.05

    modulus of rigidity of the rubber = τ/γ = (6.33*10⁵ Pa) / (0.05)

    = 12.6*10⁶ Pa or 12.6 MPa
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