Standard gradient models and crack simulation

Nguyen Quoc Son, Nguyen Truong Giang
Author affiliations

Authors

  • Nguyen Quoc Son Laboratoire de Mecanique des Solides, Ecole Polytechnique, 91128 Palaiseau, France
  • Nguyen Truong Giang Laboratoire de Mecanique des Solides, Ecole Polytechnique, 91128 Palaiseau, France

DOI:

https://doi.org/10.15625/0866-7136/33/4/261

Keywords:

Gradient and higher gradient models, damage mechanics, standard visco-plasticity, localization and crack propagation

Abstract

The standard gradient models have been intensively studied in the literature, cf. Fremond (1985) or Gurtin (1991) for various applications in plasticity, damage mechanics and phase change analysis. The governing equations for a solid have been introduced essentially from an extended version of the virtual equation. It is shown here first that these equations can also be derived from the formalism of energy and dissipation potentials and appear as a generalized Biot equation for the solid. In this spirit, the governing equations for higher gradient models can be straightforwardly given. The interest of gradient models is then discussed in the context of damage mechanics and crack simulation. The phenomenon of strain localization in a time-dependent or time-independent process of damage is explored as a convenient numerical method to simulate the propagation of cracks, in relation with some recent works of the
literature, cf. Bourdin & Marigo [3], Lorentz & al  [5], Henry & al [12].

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Published

12-12-2011

Issue

Section

Research Article