고체역학 (Gere) — Stresses in Beams (Basic Topics): Problem 5.7-5

5.7-5 Refer to the tapered cantilever beam of solid circular cross section shown in Fig. 5-26 of Example 5-9. (a) Considering only the bending stresses due to the load P, determine the range of values of the ratio \(d_B/d_A\) for which the maximum normal stress occurs at the support. (b) What is the maximum stress for this range of values?