Question

The fatigue limit of steel is around ____ times the ultimate tensile strength.

(a) 0.3

(b) 5

(c) 3

(d) 0.5

This question was posed to me by my college director while I was bunking the class.

This interesting question is from Aircraft Materials topic in division Testing Aircraft Materials of Aerospace Materials & Processes

Answer 1

Correct choice is (d) 0.5

To elaborate: The fatigue limit is different for different materials. For the material steel, the fatigue limit is around 0.5 of its ultimate tensile strength. For materials that are non-ferrous in nature, the fatigue limit can 0.3 or 0.4 of its ultimate tensile strength.