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Question on steel fatigue

Question on steel fatigue

Question on steel fatigue

(OP)
Does anyone know, or has a reference to, how the endurance limit varies with minimum stress in a steel fatigue situation ?

RE: Question on steel fatigue

i think you're referring to the cycle minimum stress.  

endurance limit assumes minimum stress = 0.  if you've got cycle max > EL and cycle min = (cycle max - EL) (ie the stress cycle 0-EL-0 is shifted up) then you're going to be very close to infinite life.  there is a stress ratio effect but generally R > 0 is beneficial.

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