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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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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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Please briefly explain why you feel this answer should be reported.