Geodesic
On ellipticity of hyperelastic models based on experimental data
Contemporary Mathematics. Fundamental Directions, Differential and functional differential equations, Tome 63 (2017) no. 3, pp. 504-515.

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The condition of ellipticity of the equilibrium equation plays an important role for correct description of mechanical behavior of materials and is a necessary condition for new defining relationships. Earlier, new deformation measures were proposed to vanish correlations between the terms, that dramatically simplifies restoration of defining relationships from experimental data. One of these new deformation measures is based on the QR-expansion of deformation gradient. In this paper, we study the strong ellipticity condition for hyperelastic material using the QR-expansion of deformation gradient. 
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V. Yu. Salamatova; Yu. V. Vassilevskii. On ellipticity of hyperelastic models based on experimental data. Contemporary Mathematics. Fundamental Directions, Differential and functional differential equations, Tome 63 (2017) no. 3, pp. 504-515. http://geodesic.mathdoc.fr/item/CMFD_2017_63_3_a7/

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