03-09-2016, 11:04 AM
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A machine component is subjected to a flexural stress which fluctuates between + 300 MN/m2 and – 150 MN/m2. Determine the value of minimum ultimate strength according to Goodman relation; and Soderberg relation. Take yield strength = 0.55 Ultimate strength; Endurance strength = 0.5 Ultimate strength; and factor of safety = 2.
Solution.
Given : 1 = 300 MN/m2 ;2 = – 150 MN/m2 ; y = 0.55 u ; -1 = 0.5 u ; F.S. = 2