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Helical spring

  1. Sep 6, 2007 #1
    how can we increase or decrease the stiffness of a spring
  2. jcsd
  3. Sep 6, 2007 #2


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    Gold Member

    Thicker cross-section?
  4. Sep 6, 2007 #3


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    Homework Helper

    The basic design formula is

    Spring stiffness = [tex]\frac{Gd^4}{8nD^3}[/tex]

    G = shear modulus of material
    d = wire diameter
    D = spring diameter
    n = number of coils.

    [tex]G = \frac{E}{2(1 + \nu)}[/tex]

    where E is Young's Modulus, [itex]\nu[/itex] is Poisson's ratio.

    You can change any or all of G, D, d or n.
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