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Combined Stress

Combined Axial + Bending Stress Calculator

Visualize normal stress distribution from axial force and biaxial bending moments on rectangular or circular cross-sections. Compute neutral axis, max stress and safety factor in real time.

Parameters
Cross-section
Width b 100 mm
Height h 200 mm
Material (Yield Stress)
Axial Force N 0 kN
Positive = tension, negative = compression
Bending Moment M_y 50 N·m
Bending Moment M_z 0 N·m
σ_max Tensile [MPa]
σ_min Compressive [MPa]
Neutral Axis z [mm]
Safety Factor SF

Theory

$$\sigma = \frac{N}{A} + \frac{M_y}{I_y}z + \frac{M_z}{I_z}y$$

Rectangle: $A=bh$,   $I_y=\dfrac{bh^3}{12}$,   $I_z=\dfrac{hb^3}{12}$

Circle: $A=\dfrac{\pi D^2}{4}$,   $I_y=I_z=\dfrac{\pi D^4}{64}$

Safety factor: $SF = \sigma_y / |\sigma_{max}|$

CAE Applications: Column & beam section preliminary design / eccentric axial loading (M = N·e) / pre-FEM hand-calculation check. Results can be cross-checked against AISC and Eurocode 3 combined stress interaction equations.