Fatigue failure in steel structures is governed by:
Choose the correct answer
Static strength (yield stress)
Range of stress cycles and number of cycles (S-N curve)
Minimum stress in the cycle
Maximum stress only
Correct Answer
B. Range of stress cycles and number of cycles (S-N curve)
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Fatigue failure depends on the stress range (sigma_max - sigma_min) and number of load cycles N. IS 800 uses S-N (Wohler) curves for different detail categories. Stress range decreases with increasing N (log-log relationship).
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