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Q: When is fatigue typically observed in materials?
  • A. Under high temperatures
  • B. Under cyclically repeated stress
  • C. Under impact forces
  • D. Under constant load
Correct Answer: Option B - Fatigue–Deterioration of a material under repeated cycles of stress or strain resulting in progressive cracking that eventually produces fracture is called fatigue. It is typically observed in materials under cyclically repeated stress. In a typical fatigue failure, a microscopic crack from at a point of high stress and gradually enlarges as the loads are applied repeatedly, when crack becomes large, sudden failure occurs.
B. Fatigue–Deterioration of a material under repeated cycles of stress or strain resulting in progressive cracking that eventually produces fracture is called fatigue. It is typically observed in materials under cyclically repeated stress. In a typical fatigue failure, a microscopic crack from at a point of high stress and gradually enlarges as the loads are applied repeatedly, when crack becomes large, sudden failure occurs.

Explanations:

Fatigue–Deterioration of a material under repeated cycles of stress or strain resulting in progressive cracking that eventually produces fracture is called fatigue. It is typically observed in materials under cyclically repeated stress. In a typical fatigue failure, a microscopic crack from at a point of high stress and gradually enlarges as the loads are applied repeatedly, when crack becomes large, sudden failure occurs.