Berekening van een perspassing — vaste aansluitdiameter van 23mm

The legacy "please login" demo lock froze the interface diameter d to 23 mm (also the page's own default). Every other input (bore/outer diameters, length, interference, friction, moduli, Poisson ratios) was already free to vary under the lock and remains free here — the formula itself is identical to the unlocked e3_8 model (press-fit.ts). Interference δ is typically δ/d ≈ 0.001 and should be corrected for surface roughness; assumes stresses stay below the elastic limit. Independently of the diameter lock, if the entered bore/outer diameters are physically invalid relative to the fixed interface diameter (outer diameter smaller than the bore, or a negative bore), the legacy source silently discards both and substitutes its own defaults (dᵢ=20 mm, dₒ=80 mm) rather than rejecting the input — preserved exactly, with no separate output showing the diameters actually used. Separately, entering dₒ=0 is a supported special case (unlike the reset above) — the legacy source treats it as an effectively infinite outer diameter (a very thick outer part with no defined outer boundary), substituting a large finite stand-in value rather than 0 itself; this is not indicated in the field label.

Methode & referenties

• Lame’s equations for thick-walled cylinders (elastic regime).
• Default values represent a bronze bush in a steel flange.
• FIXED GEOMETRY: interface diameter d = 23 mm — the original login gate forces this value regardless of input; see notes.

• ISO 286-2 hole & shaft tolerance reference tables

De berekening is een letterlijke overzetting van de originele client-side JavaScript van /calculators/c5_14.htm. Resultaten zijn geverifieerd gelijk aan het origineel via een geautomatiseerde golden-master-test. Geen enkele formule is opnieuw afgeleid of “verbeterd”.