LAUSR

We analyze, both experimentally and numerically, two EVA foam specimens with densities =120kg/m3 and =220kg/m3. In the numerical analysis, we use our recent finite strain element formulations based on least-squares strains (in both solid-shells and full three-dimensional discretizations). The OgdenHill hyperelastic model is coupled with a one-term standard solid containing a Maxwell element. Compression experiments are performed to evaluate the OgdenHill properties for the two EVA foams. Viscous properties are obtained from interpolation of creep results reported by R. Verdejo. An exponential integration of the internal variables (which have the role of back-stresses) is proposed along with the complete description of the constitutive system. The classical analysis of the acoustic tensor is also performed for the measured properties. Four benchmark examples are introduced. HighlightsExperimental determination of EVA properties by compression tests (performed in a Shimadzu AG-X Plus 100kN testing machine).Use of new mixed solid and solid/shell elements capable of very large compressive strains in foams.Contour maps of the strong ellipticity indicator and the acoustic determinant for the experimentally obtained properties.Exponential integration of the internal variables (which have the role of back-stresses) is proposed.Three finite-strain benchmarks proposed here for testing of EVA foams.