Calculate fatigue life using industry-standard S-N curves from DNV, API, BS 7608, and more. Interactive visualization with instant results.
DNV-RP-C203 provides S-N curves for fatigue analysis of offshore steel structures. The curves account for different weld details, environments, and thickness effects. This is the most widely used standard for offshore fatigue assessment.
Basic S-N Relationship:
N = a / (Sm)
Where:
N = Number of cycles to failure
S = Stress range (MPa)
a = S-N curve intercept (log scale)
m = Negative inverse slope
Fatigue Damage (Miner's Rule):
D = n / N
Where:
D = Cumulative fatigue damage
n = Applied number of cycles
N = Allowable cycles from S-N curve
Failure when D >= 1.0
Our automated fatigue assessment system includes 221+ S-N curves from 17 international standards, multi-stress state analysis, and automated reporting.
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