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Notch coefficient shaft8/30/2023 ![]() Generally, preferred SI units have been stated. One approach which is relevant to the present discussion is that proposed by Lipson & Juvinal( 60) which utilises fatigue stress concentration factors, K f, suitably modified by various coefficients to take account of the above-mentioned variables. Stronger shaft the shaft, lower notch coefficient Economical lot production using a hobbing method High accuracy of production similarly as with accurate gears. It is well known (and discussed in detail in Chapter 11) that the fatigue life of components is affected by a great number of variables such as mean stress, stress range, environment, size effect, surface condition, etc., and many different approaches have been proposed to allow realistic estimations of life under real working conditions as opposed to the controlled laboratory conditions under which most fatigue tests are carried out. The value of K f is normally obtained from fatigue tests on identical specimens both with and without the notch or stress-raiser for which the stress concentration effect is required. ![]() K ƒ is sometimes referred to by the alternative titles of "fatigue strength reduction factor" or, simply, the "fatigue notch factor". ![]() ![]() (10.31) K f = S n f o r unnotched material S n f o r notched material ![]()
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