Fatigue based on Random Vibration

Hi guys,

I need to perform fatigue analysis using a PSD as my input data. SW will not allow this...I have been working on generating a modal time history of the PSD but I end up with too many points (1E06)!. I was planning on getting the Von M stress from a single load from the specta and in excel scaling the other loads according to the stress in the orginal model and then applying Miners rule for each peak in load spectra.

Is there another way to do this?

BTW Im working with AL6082T6...its difficult to get SN Curve for....any reliable sources please?

Thanks in advance,

Mark