A round steel bar of a length of 400mm and a diameter of 15mm at the middle portion is subjected to an axial tensile force of 17kN. What should be the diameter at the outer collars if the stress in the collar is not to exceed 40MPa? What is the magnitude of ‘a’ if the total extension in the bar is not to exceed 0.17mm? E = 200GPa (Fig. 1.48).
