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A steel bar of length L with the cross section shown is twisted through 90. Determine the smallest ratio L/b for which the maximum

A steel bar of length L with the cross section shown is twisted through 90. Determine the smallest ratio L/b for which the maximum shear stress will not exceed 150 MPa. Use G = 80 GPa for steel. a = 4b FIG. P3.54 b

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