Fatigue failure and it's prediction techniques.
The components that undergo varying loa d with respect to time and can fail well below the Ultimate tensile stress is called Fatigu e failure. If you don't know , this failure contributes up to 90% of the total failure worldwide. So it is certainly very important to predict this type of failure and find a solution to avoid this failure. To understand fatigue failure we will list out the components undergoing fatigue loading. 1. Drive shaft of the car Source: Drive Shaft Fatigue Failure – Duffner Engineering 2. Wind Turbines Source: More Wind Turbine Self-Incinerations & 10 Tonne Blade Throws – STOP THESE THINGS Cause of Fatigue failure Fatigue failure occurs in 3 stages 1. Crack formation Due to the constant to and fro motion (straining) crack is formed in the high stress regions ( below Ultimate tensile strength) 2. Crack Propagation Since the crack can propagate. The crack which started initiating first is now extended . 3. Fracture. The extended crack will lead to fractu