Geodesic
Note on a mixed variational principle in finite elasticity
Atti della Accademia nazionale dei Lincei. Rendiconti Lincei. Matematica e applicazioni, Série 9, Tome 3 (1992) no. 1, pp. 69-74 Cet article a éte moissonné depuis la source Biblioteca Digitale Italiana di Matematica

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In the present context the variation is performed keeping the deformed configuration fixed while a suitable material stress tensor \( \mathcal{S} \) and the material coordinates are required to vary independently. The variational principle turns out to be equivalent to an equilibrium problem of placements and tractions prescribed at the boundary of a body of finite extent. 
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     title = {Note on a mixed variational principle in finite elasticity},
     journal = {Atti della Accademia nazionale dei Lincei. Rendiconti Lincei. Matematica e applicazioni},
     pages = {69--74},
     year = {1992},
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     number = {1},
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     mrnumber = {MR1160002},
     language = {en},
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Maugin, Gérard A.; Trimarco, Carmine. Note on a mixed variational principle in finite elasticity. Atti della Accademia nazionale dei Lincei. Rendiconti Lincei. Matematica e applicazioni, Série 9, Tome 3 (1992) no. 1, pp. 69-74. http://geodesic.mathdoc.fr/item/RLIN_1992_9_3_1_a8/