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Factor of safety and probability of failure 4 Hence (2) Note that, theoretically, the denominator for calculation of variance of samples should be n, not (n 1) However, for a finite number of samples, it can be shown that the correction factor n/(n1), known as Bessel's correction, gives a better estimate For practical purposesFor yield strength, the safety factor in most cases is a ⅔ multiplier, with the joint efficiency factor of 085 applied in the same case as for tensile;613,14 (Summary) Torsional Fatigue Strength under fluctuating Stresses & Combine loading! Factor Of Safety An Overview Sciencedirect Topics Safety factor yield strength equation