AbstractIn part I it was shown that if the strain energy functiondocumentclass{article}pagestyle{empty}begin{document}$$ {rm w} = sumlimits_{ij = 0}^infty {C_{ij} (I_1 #x02010; 3)^i ({rm I}_2 #x02010; 3)^j } $$end{document}was expanded to a sufficient degree and the coefficientsCijwere found by regression to pure homogeneous strain data, then stress–strain equations could be derived to give accurate solutions to design problems even at relatively high extensions. The problems of applying this theory to filed vulcanizates are discussed and a way of obtaining pure homogeneous strain data for for such materials is suggested. Stress–strain equations fitted to the data are found to be general within the range of experimental strains and in some cases will extrapolate outside this range. The equations can be used in design applications where strains are greater than would be experienced in normal engineering pract
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