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Q: The phenomenon of 'fatigue failure' in steel structures is primarily caused by:
  • A. Excessive loading
  • B. Corrosion
  • C. Repeated cyclic loading
  • D. Temperature fluctuations
Correct Answer: Option C - Fatigue failure is the formation and propagation of cracks due to a repetitive or cyclic load. Most fatigue failures are caused by cyclic loads significantly below the load that would result in yielding of the material.
C. Fatigue failure is the formation and propagation of cracks due to a repetitive or cyclic load. Most fatigue failures are caused by cyclic loads significantly below the load that would result in yielding of the material.

Explanations:

Fatigue failure is the formation and propagation of cracks due to a repetitive or cyclic load. Most fatigue failures are caused by cyclic loads significantly below the load that would result in yielding of the material.