Fatigue Strength Reduction Factor
Fatigue Strength Reduction Factor
(OP)
Hi,
Does anyone know how to determine what the fatigue strength reduction factor should be for a fatigue analysis of a part or assembly? I have read the help files both in the tech support section of the ptc web site, and by going through the help files in Pro, and have found nothing helpful at all. Does anyone have any sort of guideline for determining this factor?
Thanks,
Tom
Does anyone know how to determine what the fatigue strength reduction factor should be for a fatigue analysis of a part or assembly? I have read the help files both in the tech support section of the ptc web site, and by going through the help files in Pro, and have found nothing helpful at all. Does anyone have any sort of guideline for determining this factor?
Thanks,
Tom
RE: Fatigue Strength Reduction Factor
There is no single answer. Fatigue analysis is very complicated and there are some sophisticated analysis packages for studying just this type of problem (nCode for example). Some questions to consider: Are you performing strain-life or stress life predictions? Will you be applying a Neuber correction factor?
Best regards,
Matthew Ian Loew
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.
RE: Fatigue Strength Reduction Factor
- Dave
RE: Fatigue Strength Reduction Factor
Kf = 1+ q(kt -1) where kt is stress concentration factor.
Notch sensitivity factor q can be found from Peterson's guide or by using q=1/(1 + a/r) where a is a constant and given by a= ((300/Su)^1.8)/1000
Su = Ultimate tensile strength of the mtrl.
Hope that helps.