Question

Circular beams of uniform strength can be made by varying diameter in such a way that

Answer 1

Generally the beams are commonly employed are of uniform section throughout their length. Limiting stresses are reached only at the section subjected to the maximum bending moment. At all other sections of the beam, maximum allowable stress is not reached and the material is not put to its most economical use and as a result a considerable amount of the material is understressed and is wasted. To achieve the most economical use of the material, beams of uniform strength throughout their length can be suitably designed, so that the maximum stress developed anywhere along the length remains the same.