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On the form of the strain energy function for a family of SBR materials


  • R. J. Arenz

    1. Propulsion and Materials Research, Jet Propulsion Laboratory, Pasadena, California 91103
    2. Mechanical Engineering Department, Loyola Marymount University, Los Angeles, California 90045
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A strain energy function of the Valanis-Landel type, W = w1) + w2) + w3), is shown to be applicable to styrene–butadiene rubber (SBR) materials having varying crosslink densities νe. A previously obtained functional form of the strain energy derivative w′(λ), normalized by dividing by νe, is confirmed by one of the validity check plots in which a single curve represents the whole body of large-deformation test results for all degrees of biaxiality and crosslink density.

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