1) For a 1030 HR steel shaft with a bending moment of 400in-lbf, torque of 300in-lbf, stress concentration caused by a retaining ring groove with a relevant shaft diameter of 1.5in, what is the safety factor against fatigue using the Goodman Criteria?
2) For a 1030 HR steel shaft with a bending moment of 100in-lbf, torque of 200in-lbf, stress concentration caused by a wide radius with a relevant shaft diameter of 0.75in, what is the safety factor against fatigue using the Goodman Criteria?
Im using the Shigley's Mechanical Engineering Design 11th edition textbook.