Determining the Parameters of the Hereditary Kernels of Isotropic Nonlinear Viscoelastic Materials in Combined Stress State*
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The relations between the heredity kernels of isotropic nonlinear viscoelastic materials in combined and one-dimensional stress states are derived. The constitutive equations are presented in a form corresponding to the proportional deviator hypothesis. The nonlinearity of viscoelastic properties is described by Rabotnov’s type models. The creep strains and stress relaxation in thin-walled tubular elements subject to a combination of tension and torsion are determined and tested experimentally.
Keywordsnonlinear viscoelasticity isotropic material combined stress state proportional deviator hypothesis creep kernel stress relaxation kernel thin-walled tube element tension and torsion
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