Question

The resistance to fatigue of a material is measured by

• A. elastic limit
• B. endurance limit
• C. Young’s modulus
• D. ultimate tensile strength

Hint:

For fatigue design, endurance limit is more important than ultimate strength.

Answer 1

The Correct Option is B

Step 1: Understanding fatigue.
Fatigue is the failure of a material due to repeated or fluctuating stresses, often at stress levels much lower than the ultimate tensile strength.
Step 2: Definition of endurance limit.
The endurance limit is the maximum stress level below which a material can endure an infinite number of load cycles without fatigue failure.
Step 3: Eliminating incorrect options.
Elastic limit indicates the limit of elastic behavior, not fatigue resistance.
Young’s modulus measures stiffness, not fatigue strength.
Ultimate tensile strength represents maximum static strength, not cyclic performance.
Step 4: Conclusion.
Hence, the resistance of a material to fatigue is measured by its endurance limit.