Answer to Question #314416 in Mechanical Engineering for Kamal

Question

A completely reversed axial load of 20 kN is applied to a machine finished plate (BS 080M50, HR) as shown in the figure. Determine the size b of the plate for indefinite cycle of operation based on Goodman equation. Consider b = 10d = 10t. Choose safety factor of 1.5 and reliability of 99%.

Answer 1

After the axle has rotated a half turn, the bottom becomes the top and vice versa, so the stresses on a particular region of material at the surface varies sinusoidally from tension to compression and back again. This is now known as fully reversed fatigue loading.