Discussion
Assertion (A): The fatigue notch factor equals the theoretical stress concentration factor.
Reason (R): The theoretical factor is a purely elastic, geometric quantity.
Select the correct answer from the options below.
Answer: D
The assertion is false and the reason is true. Local plasticity and the steep stress gradient at a notch root mean the material does not feel the full elastic peak, so the fatigue factor is smaller, related to the elastic one through the notch sensitivity.
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