Construction

Bending Stress Calculator

Find bending stress from moment and section modulus.

Calculated Output

Bending stress (MPa) 80

Formula: σ = M ÷ S

Step-by-Step Breakdown

1. Values used:

2. Bending moment (M) = 4,000 N·m

3. Section modulus (S) = 0.0001

5. Bending stress = 80MPa

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The math behind it

σ = bending moment ÷ section modulus. Compare with the material's allowable stress.

4,000 N·m, S = 5e-5 → 80 MPa.

Allowable stress?

Steel ~165 MPa yield; wood ~8–15 MPa; must stay below it.