Question: From a shaft subjected to 60 MPa fully variable bending and 30 MPa constant torsional stress. A life of 90 000 cycles is desired. The

From a shaft subjected to 60 MPa fully variable bending and 30 MPa constant torsional stress. A life of 90 000 cycles is desired. The tensile strength of the shaft material was calculated as 725 MPa and the permanent strength was calculated as 406 MPa. What is the safety factor of the shaft according to the Goodman criterion?

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