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Which of the following is True about fatigue crack?

21. Which of the following is True about fatigue crack?

1. A fatigue crack is a crack that forms in a material as a result of constant stress
2. A fatigue crack is a crack that forms in a material as a result of non-repetitive cyclic loading
3. A fatigue crack is a crack that forms in a material as a result of repetitive cyclic loading
4. A fatigue crack is a crack that forms in a material as a result of repetitive non-cyclic cyclic loading

Answer: C) A fatigue crack is a crack that forms in a material as a result of repetitive cyclic loading.

Explanation:

A fatigue crack is a crack that forms in a material as a result of repetitive cyclic loading.