Mechanical characterization of a viscoelastic plastic granular material sensitive to hydrostatic pressure

  • Authors:

  • M. Gratton;V. D. Le;A. Frachon;M. Caliez;D. Picart

  • Affiliations:

  • Laboratoire de Mécanique et Rhéologie, Université F-Rabelais Tours, Ecole d'Ingénieurs du Val de Loire, Blois Cedex, France;Laboratoire de Mécanique et Rhéologie, Université F-Rabelais Tours, Ecole d'Ingénieurs du Val de Loire, Blois Cedex, France;Laboratoire de Mécanique et Rhéologie, Université F-Rabelais Tours, Ecole d'Ingénieurs du Val de Loire, Blois Cedex, France;Laboratoire de Mécanique et Rhéologie, Université F-Rabelais Tours, Ecole d'Ingénieurs du Val de Loire, Blois Cedex, France;C.E.A. Le Ripault, Monts, France

  • Venue:
  • ICOSSSE'05 Proceedings of the 4th WSEAS/IASME international conference on System science and simulation in engineering
  • Year:
  • 2005

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Abstract

This paper deals with the characterization of the static mechanical behaviour of an energetic material. Due to the constituents (crystals and a polymeric binder), the behaviour is complex. Therefore, a complete experimental rotocol and a model have been developed. The behaviour is described using a general Maxwell model in which all the branches are affected by isotropic damage. The first branch takes into account an elastic-plastic behaviour. The yield stress evolution is described by a parabolic criterion and by an isotropic hardening law. The plastic flow rule is nonassociated. The other branches are viscoelastic. A genetic algorithm has been used to optimise the parameters. At last, comparisons between the model and the experiments are proposed.