_________ is a mechanical form of degradation that occurs when a component is exposed to cyclical stresses for an extended period, often resulting in sudden, unexpected failure.

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_________ is a mechanical form of degradation that occurs when a component is exposed to cyclical stresses for an extended period, often resulting in sudden, unexpected failure.
A . Stress fatigue
B . Mechanical fatigue
C . Thermal fatigue
D . Cyclic fatigue

Answer: B