| where: | |
|---|---|
| DP(fn) = | Cumulative damage index as a function of system natural frequency |
| fn = | System natural frequency (variable), Hz |
| T = | Total exposure time in environment, seconds |
| G(fn) = | Equivalent ASD for a given DP(fn), T, g2/Hz |
| ζ = | Damping ratio of system at dominant natural frequency expressed as a decimal |
| b = | Fatigue curve slope value when computed as a linear fit in log-log domain. |
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