简介:Amolecularnetworkconstitutivemodelisproposedinthisstudy.Basedontheconceptofmolecularnetworkdecomposition,themolecularnetworkwasdecomposedintoaJames-Guth3-chainnetworkmodelandanArruda-Boyce8-chainnetworkmodel.Consideringthatthesinglemolecularchainofrubberisconstrainedbythesurroundingmolecularnetworks,the3-chainmodelandthe8-chainmodelwereconsequentlymodifiedusingthetubetheory.Theproposedmodelcontainsfourmaterialparametersthatweredeterminedbyfittingtheuniaxialtensiletestdatafromrubber-likematerials,andthevaluesoftheseparameterswereutilizedtodeterminethepureshearandthebiaxialextension.Theproposedmodelagreeswellwiththeexperimentaldataandcanpredictthetestresultsofexperimentsperformedundertheconditionsofpureshearandequi-biaxialdeformationwithacceptableaccuracy.