Estimate extreme-fibre bending stress from moment, distance to the extreme fibre, and second moment of area.
| Stress (MPa) | – |
Use this calculator for σ = My/I on a beam. Enter the bending moment in N·m, the distance from the neutral axis to the extreme fibre, and I in cm⁴.
Stress (MPa) = (M × c) / I / 1e6, with c converted from millimetres to metres and I from cm⁴ to m⁴ (× 1e-8). The distance c can be entered in millimetres (mm) or inches (in). Moment stays in N·m; I stays in cm⁴.
This is elastic flexure only. It does not apply a section modulus table lookup or a plastic modulus.
Moment (N·m): Bending moment in newton-metres.
c: Distance from the neutral axis to the extreme fibre, in mm or in.
I (cm⁴): Second moment of area in cm⁴.
Stress (MPa): Extreme-fibre stress in megapascals.
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