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Formula to obtain engineering stress for Elastomers

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  • 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
    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

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

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