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To specify the probability density function to be used in calculating fatigue life estimates from stress spectra.
Refer to Fatigue Analysis (Mode 1) for further information on this feature.
One line of data specifying the probability density function as follows.
PDF=PDF Type
PDF Type can be RAYLEIGH or DIRLIK. This keyword is optional. If omitted, PDF Type defaults to RAYLEIGH.
Input: |
Description |
Probability Density Function: |
This option allows you to choose the probability density function (pdf) to be used in calculating fatigue life estimates from stress spectra. The standard Rayleigh PDF (the default) is narrow banded, while the Dirlik PDF is more appropriate when the stress spectra are broad banded. |