AbstractA strain energy function of the Valanis‐Landel type,W=w(λ1) +w(λ2) +w(λ3), 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 derivativew′(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 cros
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