Write a mathematical expression for s

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For steels, the endurance limit is approximately 1/2 of the tensile strength, and the fatigue strength at 103 cycles is approximately 90% of the tensile strength. The S-curves can be approximated by a straight lines between 103 and 106 cycles when plotted as log() versus log(N). Beyond 106 cycles the curves are horizontal.

A. Write a mathematical expression for as a function of for the sloping part of the S-curve, evaluating the constants in terms of the approximations above.

B. A steel part fails in 12,000 cycles. Use the above expression to ?nd what % decrease of applied (cyclic) stress would be necessary to increase in the life of the part by a factor of 2.5 (to 30,000 cycles).

C. Alternatively, what % increase in tensile strength would achieve the same increase in life without decreasing the stress?

Reference no: EM13887384

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