Miner's Rule Cumulative Damage

Cumulative fatigue damage D = Σ n_i / N_i. Failure predicted at D = 1.

StructuralFatigue

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This calculator requires JavaScript to compute its result. The formula, symbols, and regulatory sources are shown in the Formula section below.

Formula, assumptions, and limits

D = \sum_i \frac{n_i}{N_i}

Symbol	Meaning	Unit
$n_i$	Actual cycles at stress level i
$N_i$	Allowable cycles from S-N curve
$D$	Cumulative damage

Source: Miner (1945) - Cumulative damage in fatigue; DNV-RP-C203 - Fatigue design

Cumulative fatigue damage D = \u03a3 n_i / N_i.