Explain the concept of unsymmetrical bending. What are the conditions that should be satisfied for a beam to bend without twisting? A circular steel bar of diameter 5 mm and length 2 m is bent into an...

Explain the concept of unsymmetrical bending. What are the conditions that should be satisfied for a beam to bend without twisting?

A circular steel bar of diameter 5 mm and length 2 m is bent into an arc of radius R m such that the chord length becomes 90% of its length. Find the maximum stress in the material if E = 200 GPa.