Spring Buckling Calculator

Inputs

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Diameter of the spring wire.
mm
Center-to-center across the coil (outside diameter minus wire diameter).
mm
Coils that actually deflect.
Unloaded spring length used for buckling slenderness.
mm
Compression at the checked operating point.
mm
Sets Young modulus E and shear modulus G for the buckling constants.
Sets the end-fixity constant used in effective slenderness.

Results

Default result
Edit inputs
Working utilization(x / x_crit)
33.33%
Pass

Comfortable margin to the limiting deflection.

Working deflection as a share of the limiting deflection.

Also computed

Critical deflection(x_crit)Pass30mm

Effective slenderness is below the stability constant; no buckling before solid height is predicted by this model.

Critical load(F_crit)37.17N

8.357 lbf

Deflection margin(x_crit - x)Pass20mm

Working deflection is below the limiting deflection.

Effective slenderness(alpha L0 / D)Pass2

Compare with sqrt(C2) = 2.626 for the selected material.

No-buckling free length(L0 limit)52.52mm

Maximum free length for the absolute-stability screen at this mean diameter.

Mean diameter for no buckling(D_req)Pass7.617mm

Mean diameter meets the absolute-stability screen.

Method notes 3 notes
  • Buckling follows the same Shigley-style compression-spring screen used by the main compression spring calculator.
  • If effective slenderness is below the material stability constant, this model reports travel-to-solid as the finite limiting deflection because buckling is not predicted before coil bind.
  • Final spring design still needs supplier drawing/data, guides, seat flatness, dynamic side loads, fatigue, set, tolerances and testing.

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