'Fatigue failure' in steel structures occurs under:
Choose the correct answer
A single static overload event
Repeated cyclic loading at below-yield stress — crack initiates at notches/welds and propagates per S-N curve
Only in plastic range (fy exceeded)
Creep at high temperature
Correct Answer
B. Repeated cyclic loading at below-yield stress — crack initiates at notches/welds and propagates per S-N curve
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Fatigue: failure under repeated cyclic loading at stresses BELOW static yield strength. Crack initiates at stress concentration (weld toe, notch, hole). Propagates with each cycle. S-N curve (stress range vs. cycles to failure): no endurance limit for steel in corrosive environment. IS 800 Cl. 13 provides fatigue design: stress ranges and detail categories. Critical for: crane girders, bridges, offshore structures.
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