A vibration isolation unit consists of two blocks of hard rubber bonded to plate AB and

Chapter 9, Problem 9.82

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A vibration isolation unit consists of two blocks of hard rubber bonded to plate AB and to rigid supports as shown. For the type and grade of rubber used, \(\tau_{\text {all }}=220\) psi and G = 1800 psi. Knowing that a centric vertical force of magnitude P = 3.2 kips must cause a 0.1-in. vertical deflection of the plate AB, determine the smallest allowable dimensions a and b of the block.

                                               

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