Existence of strong minimizers for the Griffith static fracture model in dimension two
Annales de l'I.H.P. Analyse non linéaire, Tome 36 (2019) no. 2, pp. 455-474.
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We consider the Griffith fracture model in two spatial dimensions, and prove existence of strong minimizers, with closed jump set and continuously differentiable deformation fields. One key ingredient, which is the object of the present paper, is a generalization to the vectorial situation of the decay estimate by De Giorgi, Carriero, and Leaci. This is based on replacing the coarea formula by a method to approximate SBDp functions with small jump set by Sobolev functions, and is restricted to two dimensions. The other two ingredients will appear in companion papers and consist respectively in regularity results for vectorial elliptic problems of the elasticity type and in a method to approximate in energy GSBDp functions by SBVp ones.

DOI : 10.1016/j.anihpc.2018.06.003
Mots-clés : Calculus of variations, Functions of bounded deformation, Existence, Fracture mechanics, Griffith's model
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Conti, Sergio; Focardi, Matteo; Iurlano, Flaviana. Existence of strong minimizers for the Griffith static fracture model in dimension two. Annales de l'I.H.P. Analyse non linéaire, Tome 36 (2019) no. 2, pp. 455-474. doi : 10.1016/j.anihpc.2018.06.003. http://www.numdam.org/articles/10.1016/j.anihpc.2018.06.003/

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