Beam Bending Stress

Beam bending stress, abbreviated as \(\sigma \) (Greek symbol sigma), also called flexure, is when a beam is subjected to a load along it's length axis with stress applied perpendicular to the axis.

 

 

 

 

 

 

 

Beam Bending Stress formula
\(\large{ \sigma_b = \frac{M \; y}{I} }\)
Symbol	English	Metric
\(\large{ \sigma_b }\)  (Greek symbol sigma) = bending stress	\(\large{\frac{lbf}{in^2}}\)	\(\large{Pa}\)
\(\large{ M }\) = moment about the neutral axis	\(\large{\frac{lbf}{sec}}\)	\(\large{\frac{kg-m}{s}}\)
\(\large{ y }\) = perpendicular distance to the neutral axis	\(\large{in}\)	\(\large{mm}\)
\(\large{ I }\) = second moment of area about the neutral axis (moment of inertia)	\(\large{in^4}\)	\(\large{mm^4}\)