The stepped rod shown in sketch k is subjected to a tensile force that varies between 15,000 and 30,000 N. The rod has a machined surface finish everywhere except the shoulder area, where a grinding operation has been performed to improve the fatigue resistance of the rod. Using a 99% probability of survival, determine the safety factor for infinite life if the rod is made of AISI 1080 steel, quenched and tempered at 800C. Use the Goodman line. Does the part fail at the fillet? Explain.

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