Symbol in context

$n_i$

This entry links every published equation using this exact notation. Its meaning may change between equations.

Meanings in context

Article-grounded definition

cycles actually applied at a given stress level.

\text{cumulative damage} \approx \sum_i \frac{n_i}{N_i}

This equation gives an approximation: it relates the quantities while allowing an approximation.

n_i

cycles actually applied at a given stress level.

n_i

This mathematical expression combines the displayed quantities; its precise role follows from the surrounding article text.

\text{Cost}(n_i, n_o) = \begin{cases} n_i\, p_i^{L} + n_o\, p_o^{L}, & n_i < T \\ n_i\, p_i^{H} + n_o\, p_o^{H}, & n_i \geq T \end{cases}

This equation states a bound: one expression must stay on the indicated side of the other under the article’s assumptions.