Question

The maximum stress at which even a billion reversals of stress cannot cause fatigue failure of the material is called as:
1. Factor of safety
2. Lower Limit
3. Endurance Limit
4. Permissible limit

Answer 1

Correct Answer - Option 3 : Endurance Limit

Explanation:

Fatigue:

• The deformation of a material due to t repeated cycle of stress & strain resulting in progressive cracking.
• In a typical fatigue failure, a microscopic crack developed at a point of high stress and gradually enlarge as the loads are applied repeatedly, when crack become large sudden failure occurs.
• Endurance limit is the stress level below which even a large number of stress cycles can not produce fatigue failure.