Factor of Safety

Written by Jerry Ratzlaff on . Posted in Dimensionless Numbers

Factor of safety, abbreviated as FS, also called safety factor, a dimensionless number, is the ability of a system's structural capacity to be usable beyond it's expected or acrual loads.


factor of safety formula

\(\large{ FS = \frac {UTS}{R}  }\) 
Symbol English Metric
\(\large{ FS }\) = factor of safety \(\large{ dimensionless }\)  
\(\large{ R }\) = applied stress \(\large{ \frac{lbf}{in^2} }\) \(\large{ Pa }\)
\(\large{ UTS }\) = ultimate tensile stress \(\large{ \frac{lbf}{in^2} }\) \(\large{ Pa }\)


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Tags: Strain and Stress Equations Safety Equations