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A rotating shaft made of AISI 1018 cold-drawn steel transmits torque while experiencing a bending moment. Find the minimum diameter needed for infinite life with a design factor of 2.0. Step-by-Step Mathematical Solution Ultimate Tensile Strength ( Sutcap S sub u t end-sub Yield Strength ( Sycap S sub y Determine Endurance Limit ( Secap S sub e
Se=0.75×220=165 MPacap S sub e equals 0.75 cross 220 equals 165 MPa