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Thread: Formula to obtain engineering stress for Elastomers

  1. #1
    Join Date
    2011-03
    Location
    Gerona, Catalunya
    Posts
    3

    Formula to obtain engineering stress for Elastomers

    So, After uniaxial tests We all use the conventional formulas to obtain engineering stress and strain:
    Strain=L-Lo/Lo
    Stress=F/A

    But my advisor told me of a different formula to calculate engineerig stress for elastomers due to the fact that the response is not linear anymore.. He mentioned it but I am not able to find it anywhere.. It may be something like this:
    Stress=TF^-1

    Any reference or someone please correct me?

  2. #2
    Join Date
    2000-02
    Location
    Boston, USA
    Posts
    3,359
    Your first equation should be: strain = (L - L0) / L0

    There may be different ways to calculate the engineering stress and strain. What type of experimental data do you have (uniaxial, torsion, shear?)

    -Jorgen
    Jorgen Bergstrom, Ph.D.
    PolymerFEM Administrator

  3. #3
    Excellent post I must say.. Simple but yet entertaining and engaging..

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