Q#5: (Marks 6) A machine component subjected to cyclic loading with a maximum value of S. 150 ksi, and Simin = 30 ksi, a

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Q 5 Marks 6 A Machine Component Subjected To Cyclic Loading With A Maximum Value Of S 150 Ksi And Simin 30 Ksi A 1 (29.47 KiB) Viewed 69 times

Q#5: (Marks 6) A machine component subjected to cyclic loading with a maximum value of S. 150 ksi, and Simin = 30 ksi, and you may use Safety factor - 1. Note that the maximum and minimum stress accounts for the safety factor, i.e., SF - 1, means o. = 5, and on-Sm. The component is made from steel of ultimate tensile strength, Si = 180ksi and the corrected endurance strength, S. (at 10 cycles) = 80 ksi, with fully-reversed loading applied on to the component; and fatigue strength of Si at 10 cycles 150 ksi. From experience, it is anticipated that the endurance limits. (at 10 cycles) = 80 ksi may not be adequate. Determine whether fatigue strength Sy is greater or less than S, and then calculate fatigue life N, with the corrected fatigue strength S values, using Goodman and Gerber criteria only. Determine whether the machine will have a shorter or longer life than 10 cycles in these two cases. If any of them has the value of corrected endurance strength is greater than the given value of 80 ksi, determine the life in cycles that the component can survive,