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Does durometer rating have units?

Discussion in 'Biomechanics, Sports and Foot orthoses' started by markjohconley, Jun 13, 2013.

  1. markjohconley

    markjohconley Well-Known Member

    Members do not see these Ads. Sign Up.
    Tried a search but was unable to comprehend exactly what they were saying, a bit like explanations for stiffness, physics .....
    Would it be (kg cm-1)?
  2. Craig Payne

    Craig Payne Moderator

    Nope. It is a unitless or dimensionless value from 1 to 100.
  3. Craig Payne

    Craig Payne Moderator

    Here is the wiki article on it:

    Shore durometer

    Two inline skates wheels with different durometer - 85A and 83A.
    Hardness tester shore (Shore durometer)

    Durometer is one of several measures of the hardness of a material.

    Higher numbers indicate harder materials; lower numbers indicate softer materials.

    Hardness may be defined as a material's resistance to indentation. The durometer scale was defined by Albert Ferdinand Shore, who developed a device to measure Shore hardness in the 1920s. The term durometer is often used to refer to the measurement as well as the instrument itself. Durometer is typically used as a measure of hardness in polymers, elastomers, and rubbers.[1]

    Shore's device was neither the first hardness tester nor the first to be called a durometer (ISV duro- and -meter; attested since the 19th century), but today that name usually refers to Shore hardness.(Other devices are simply called Hardness Testers)

  4. markjohconley

    markjohconley Well-Known Member

    Thanks Craig, unitless.

    Sent PM re request, mark
  5. Durometer is a measure of material stiffness. High durometer midsoles are more stiff. Low durometer midsoles are less stiff. As Craig stated, it is a dimensionless quantity.

    Strain is another dimensionless quantity commonly used in biomechanics.

    Good question, Mark!:drinks
  6. Phil Rees

    Phil Rees Active Member

    This may be of some interest ...

    Uncertainty evaluation of shore hardness testers.
    Measurement, Volume 33, Issue 3, April 2003, Pages 251-257
    M.I. Mohamed, G.A. Aggag

    "Shore hardness is used for the determination of the indentation hardness of plastics and ebonite by means of durometers of two types: durometer type A, used for softer materials and durometer type D for harder materials. The indentation hardness is inversely related to the penetration and dependent on the modulus of elasticity and the viscoelastic properties of the material. The shape of the indenter, the force applied, the duration of its application and some other factors, to be discussed later, influence the results obtained throughout the test. "

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