Chapter 6.4, Problem 55P

The tubular shaft is supported by a smooth thrust bearing al B and smooth journal bearing al A. If the material has an allowable bending stress of ${\sigma }_{allow}=20\text{ksi}$ , determine the required minimum outer diameter and the corresponding inner diameter of the shall 10 Ihc nearest $\frac{1}{16}$ in. Take the inner radius to be 0.8 times the outer radius, that is, $r_i=0.8r_o$ .