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Panel Buckling

A thin panel in compression buckles long before it yields: σ_cr = k·π²E / (12(1−ν²)) · (t/b)². Everything hinges on the thickness-to-width ratio — halve b and you quadruple the buckling stress.

Modulus E (MPa)

Poisson's ν

Thickness t (mm)

Loaded width b (mm)

Edge condition

Critical stress

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Critical load per mm

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b/t ratio

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Elastic buckling. If σcr comes out above the material yield, buckling is not the limit — plasticity is, and you need a plasticity-corrected check.

A helper, not a substitute for engineering judgment. Verify against the governing standard.