Bending Moment & Bending Stress

[tomtomtom1]

TL;DR

Bending Moment & Bending Stress
Bending Stress = Moment (M) * Distance From Neutral Axis (Z) / Second Moment Of Area (I)

Hello all

I was wondering if anyone could figure out the what the equation below means, specifically the W term?

The equation to calculate bending stress for a cross section that i have used and i know is correct is:-

Bending Stress = Moment (M) * Distance From Neutral Axis (Z) / Second Moment Of Area (I)

I cannot for the life of me figure out what W refers to??

Can anyone help?

Thank you

 

[FEAnalyst]

W stands for section modulus - moment of inertia divided by the distance from neutral axis to fibers for which we calculate bending stress (typically farthest ones). It's rarely used in English literature but can be often found in non-English books.