Certainty of Survival of S-N Curves

[feajob]

Hi,
I would like to know what is the Certainty of Survival for the S-N (stress-life) Curves presented in MMPDS?
Thanks,
A.

 

[EdStainless]

There are notes on this somewhere in MMPDS.
They give the statistical basis that was used.
And don't ask me to remember it ....
If you can't find it then call Battel Columbus as they administer MMPDS.

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P.E. Metallurgy, consulting work welcomed

 

[feajob]

Based on the e-mail reply that I received from Battel Columbus "The equation included with each MMPDS S/N curve is the typical regression line, 50% survival. And, the 97.7% survival probability can be computed, by subtracting 2.0 x the standard error of the estimate from the typical line."
Thanks,
A.

 

[SWComposites]

That's what I remembered and was going to look up - the curves are average fits thru the data.