Geodesic
Unilateral gradient flow of the Ambrosio–Tortorelli functional by minimizing movements
Annales de l'I.H.P. Analyse non linéaire, Tome 31 (2014) no. 4, pp. 779-822

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Motivated by models of fracture mechanics, this paper is devoted to the analysis of a unilateral gradient flow of the Ambrosio–Tortorelli functional, where unilaterality comes from an irreversibility constraint on the fracture density. Solutions of such evolution are constructed by means of an implicit Euler scheme. An asymptotic analysis in the Mumford–Shah regime is then carried out. It shows the convergence towards a generalized heat equation outside a time increasing crack set. In the spirit of gradient flows in metric spaces, a notion of curve of maximal unilateral slope is also investigated, and analogies with the unilateral slope of the Mumford–Shah functional are also discussed.

DOI : 10.1016/j.anihpc.2013.07.005
Keywords: Gradient flow, Γ-convergence, Free discontinuity problems, Functions of bounded variation, Mumford–Shah 
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     title = {Unilateral gradient flow of the {Ambrosio{\textendash}Tortorelli} functional by minimizing movements},
     journal = {Annales de l'I.H.P. Analyse non lin\'eaire},
     pages = {779--822},
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Babadjian, Jean-François; Millot, Vincent. Unilateral gradient flow of the Ambrosio–Tortorelli functional by minimizing movements. Annales de l'I.H.P. Analyse non linéaire, Tome 31 (2014) no. 4, pp. 779-822. doi: 10.1016/j.anihpc.2013.07.005

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