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German nomenclature for reliability and confidence - fatigue testing

German nomenclature for reliability and confidence - fatigue testing

German nomenclature for reliability and confidence - fatigue testing

(OP)
Dear eng-tips crew, need your help figuring out requirements for fatigue on this stabilizer bar.

Life 100,000 - i get that.

Random sample, min six parts - OK got that.

Here's where i get lost

"The test requirement is for Pu = 50% (actually P sub u double dot), and permissible standard deviation s log <= 0.20"

Anyone know what P sub u double dot is?

For the standard deviation requirement, I tried a simple log of my usual standard deviation and its about 4 (log of 10,000 = 4).  Not even close to the 0.2 required. so i must be doing soemthing wrong, maybe 's' is a constant?  everything is in German so its difficult to follow.

I'm used to B10C90 etc..

Help appriciated - thank you,

Jeff


 

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