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8.23 Plot on log-log coordinates estimated S-N curves for (a) bending, (b) axial, and (c) torsional loading of a 25 mm-diameter steel bar having S = 760 MPa, S, = 530 MPa, and machined surfaces. For each of the three types of loading, what is the fatigue strength corresponding to (1) 10° or more cycles, and (2) 6 x 104 cycles? [Partial ans.: For bending 36.6 ksi, 55 ksi] Repeat Problem 8.23 for a 20-mm-diameter steel bar having S. = 1100 MPa, and Sy = 715 MPa, for (a) fine ground and (b) machined surfaces. 8.24 Section 8.9 Repeat the determination of the six fatigue strengths in Problem 8.23 for the case of zero-to-maximum (rather than completely reversed) load fluctuation. [Partial ans.: For bending, 0 to 56 ksi, 0 to 74 ksi] 8.25
8.23 Plot on log-log coordinates estimated S-N curves for (a) bending, (b) axial, and (c) torsional loading of a 25 mm-diameter steel bar having S = 760 MPa, S, = 530 MPa, and machined surfaces. For each of the three types of loading, what is the fatigue strength corresponding to (1) 10° or more cycles, and (2) 6 x 104 cycles? [Partial ans.: For bending 36.6 ksi, 55 ksi] Repeat Problem 8.23 for a 20-mm-diameter-steel bar having s = 1100 MPa, and Sy = 715 MPa, for at fine ground and (b) machined surfaces. 8.24 Please answer this 8.25 only Section 8.9 8.25 Repeat the determination of the six fatigue strengths in Problem 8.23 for the case of zero-to-maximum (rather than completely reversed) load fluctuation. [Partial ans.: For bending, 0 to 56 ksi, 0 to 74 ksi)