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Necked areas in the pure shear tests. Real strain-stress???.

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  • Necked areas in the pure shear tests. Real strain-stress???.

    Dear Dr. Bergstrom and other experts,


    I’m really new in the field of rubber and in the field of FEA too so, I’ m sorry if my questions are too simple. I’m carrying out my Master Thesis (Diplomarbeit) and one area consists of validating the test data of a rubber obtained with pure shear tests (conventional device: load cell) using FEA and then using an optical device. The main problem of the test data obtained with the load cell is how to convert the engineering stress-strain to the real stress-strain, because of the appearance of a neck to low strains.
    Although there is a necked area and a heterogeneous distribution of the strain along the gage length, can I use the conventional equations s=s(e+1); e=ln(A0 / A) to obtain real stress-strain data?. Is there a mathematical model to obtain a corrected real strain-stress curve for necking, like Bridgman, Aronofsky, Tegart, … analysis in metals?. Any mathematical model to describe the stress state in the necked area and the influence of it in the test data results, for rubbers?. Bibliography?.

    Another question: how does Abaqus interpret these necked areas in the job results (strains, stresses,…)?.

    Thank very much for everything and for your great help.

    David Fol

    SF#

  • #2
    See my comments here.

    Jorgen
    Jorgen Bergstrom, Ph.D. PolymerFEM Administrator

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    • #3
      Necked areas in the pure shear tests. Real strain-stress???.

      Originally posted by Jorgen View Post
      See my comments here.

      Jorgen
      HI Dr. Jorgen,
      I cannot see your comment, can you fixed the link.

      Tq.

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