We deal with a model for an elastic material with a cohesive crack along a prescribed fracture set. We consider two n-dimensional elastic bodies and a cohesive law, on their common interface, with incompenetrability constraint and general loading-unloading regimes. We first provide a time-discrete evolution by means of local minimizers of the energy with respect to the L-2-norm of the crack opening displacement. The choice of this norm is due to technical reasons (the lambda-convexity of the energy) and is in analogy with the classical approach in quasi-static brittle fracture, where the evolution of the system is condensed into the evolution of the crack. In the "time-continuous" limit we obtain a BV-evolution, in parametrized form, characterized by Karush-Kuhn-Tucker conditions, for the internal variable, equilibrium and energy identity.
Negri, M., Scala, R. (2017). A quasi-static evolution generated by local energy minimizers for an elastic material with a cohesive interface. NONLINEAR ANALYSIS: REAL WORLD APPLICATIONS, 38, 271-305 [10.1016/j.nonrwa.2017.05.002].
A quasi-static evolution generated by local energy minimizers for an elastic material with a cohesive interface
Scala R
2017-01-01
Abstract
We deal with a model for an elastic material with a cohesive crack along a prescribed fracture set. We consider two n-dimensional elastic bodies and a cohesive law, on their common interface, with incompenetrability constraint and general loading-unloading regimes. We first provide a time-discrete evolution by means of local minimizers of the energy with respect to the L-2-norm of the crack opening displacement. The choice of this norm is due to technical reasons (the lambda-convexity of the energy) and is in analogy with the classical approach in quasi-static brittle fracture, where the evolution of the system is condensed into the evolution of the crack. In the "time-continuous" limit we obtain a BV-evolution, in parametrized form, characterized by Karush-Kuhn-Tucker conditions, for the internal variable, equilibrium and energy identity.File | Dimensione | Formato | |
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https://hdl.handle.net/11365/1087416