Problem 2: A one inch diameter machined steel cantilever 10 in. long is loaded on the end with a force that varies from 60 lb down to 100 lb up. There is a 4" fillet where the member is connected to the support which causes a theoretical stress concentration factor K=1.32. The notch sensitivity factor q may be taken at 0.92. 9 If the material has an ultimate stress su 80,000 psi, an endurance limit in reversed bending s,= 35,000, and a yield strength, s, 60,000, determine: (a) maximum bending stress, (b) minimum bending stress. (e) mean stress, (d) variable stress, (e) design factor N. m

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A:

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Pressure and Stress