2 A 2.0-in.-diameter aluminum shaft rotates at 3000 rpm and is subjected to a reversed bending moment of 1775 in. Ib. A

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2 A 2 0 In Diameter Aluminum Shaft Rotates At 3000 Rpm And Is Subjected To A Reversed Bending Moment Of 1775 In Ib A 1 (52.93 KiB) Viewed 30 times

2 A 2.0-in.-diameter aluminum shaft rotates at 3000 rpm and is subjected to a reversed bending moment of 1775 in. Ib. A crack, 0.004 in. deep, extends radially inward from the external surface. The reversed bending moment is applied remote from the crack. 2.7 and a stress intensity range of 1.5 ksi Vin., corresponding to a growth rate of Estimate the crack depth after 100 hours of operation, assuming a Paris exponent of 0.040 in./10° cycles. The configuration factor Y may be approximated by Y = [1.12 + a(2.62a - 1.59)]/(1 - 0.70m), where a = the round bar. The stress intensity factor, K, is equal to oY VTC, where is the maximum bending stress for the gross cross section (see Figure P8.54). c/w and w is the radius of M M FIGURE P8.54