Calcolatrice Costante Elastica Gratuita

Calcola la costante elastica di una molla elicoidale.

GPa
mm
mm

Spring Constant (k)

5.139 N/mm

Spring Index (C = D/d)8.33

Spring Constant (k) vs Shear Modulus (G)

Vedi formula →

Formula

## Helical Spring Constant The stiffness of a helical compression or extension spring depends on material properties, wire size, and coil geometry. ### Formula **k = G d^4 / (8 D^3 Na)** where G is the shear modulus, d is wire diameter, D is mean coil diameter, and Na is the number of active coils. The spring index C = D/d should be between 4 and 12 for practical manufacturability.

Esempio Risolto

A steel spring with 3 mm wire, 25 mm mean coil diameter, 10 active coils, G = 79.3 GPa.

  1. 01G = 79,300 MPa (= N/mm^2)
  2. 02d^4 = 3^4 = 81
  3. 03D^3 = 25^3 = 15,625
  4. 04k = 79,300 x 81 / (8 x 15,625 x 10)
  5. 05k = 6,423,300 / 1,250,000 = 5.139 N/mm
  6. 06Spring index C = 25/3 = 8.33 (good, within 4-12 range)