r5.03.17 Discrete element behavior relationships#

Summary:

This document describes the nonlinear behaviors of discrete elements that are called by the nonlinear problem solving operators STAT_NON_LINE [U4.51.03] or DYNA_NON_LINE [U4.53.01]. More specifically, the behaviors described in this document are:

  • thermo-elastic behavior ELAS,

  • the Von Mises-type isotropic work hardening behavior used for the modeling of assemblages filetés, accessible by the keywords DIS_GOUJ2E_PLAS and DIS_GOUJ2E_ELAS of the keyword factor COMPORTEMENT [U4.51.11],

  • bilinear elastic behavior, accessible by the keyword DIS_BILI_ELAS,

  • the Von Mises-type behavior with non-linear kinematic work hardening, accessible by the keyword DIS_ECRO_CINE,

  • the non-linear viscoelastic rheological behavior, accessible by the keyword DIS_VISC,

  • the non-linear elastoplastic behavior, accessible by the keyword DIS_ECRO_TRAC,

  • the contact type behavior with shock and Coulomb friction, in explicit integration with penalization stiffness, accessible by the keyword DIS_CHOC of the keyword factor COMPORTEMENT [U4.51.11],

  • the elastic nonlinear contact behavior DIS_CHOC_TRAC, in explicit integration with a nonlinear stiffness given by a function,

  • the contact type behavior with solid shock and Coulomb friction, in implicit integration, accessible by the keyword DIS_CONTACT,

  • behaviors CHOC_ENDO and CHOC_ENDO_PENA, which makes it possible to model a behavior that takes into account a threshold for the shock force, as well as a variation in stiffness and damping as a function of the relative displacement of the nodes of the discrete element,

  • the behavior of the type unilateral contact with Coulomb friction, used to model the translation and rotation behavior of all the grid-pencil connection springs of fuel assemblies, accessible by the keyword DIS_GRICRA.

  • line arming behavior, accessible by the keyword ARME,

  • the « Dashpot » type of behavior, accessible by the DASHPOT keyword,

  • non-linear behavior, which makes it possible to model a flexural junction between a wall and a floor or a slab, accessible by the keyword JONC_ENDO_PLAS.

The integration of the behavior models mentioned above is detailed in this document. Other behaviors relating to discrete elements are available, but not detailed here:

  • non-linear assembly of tower angles, relationship ASSE_CORN [R5.03.32],

  • the non-linear elastoplastic behavior of a fondation superficielle rectangulaire subjected to static or seismic three-dimensional stress, relationship FONDA_SUPERFI [R5.03.31].