A steel turbine disk with rotates at 5000 rpm carrying blades weighing a total of 540 N.The center of gravity of each blade lies on a circle of 0.575-m radius. Assuming zero pressure at the bore, determine (a) the maximum stress for a disk of constant thickness and (b) the maximum stress for a disk of hyperbolic cross section. The thickness at the hub and tip are respectively. (c) For a thickness at the axis . determine the thickness at the outer edge, for a disk under uniform stress, 84 MPa. Take
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