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$$$$ ELAS     NOTICE  AM        13/09/24    21:15:01     7826           
                                             DATE     13/09/24
                                             
  Operateur ELASTICITE                     Voir aussi :
    --------------------   
      CHAM2 = ELAS  MOD1 CHAM1 CAR1 (VAR1);


    Description :
    ____________

    This operator computes stresses from strains, or strains from
 stresses, when considering an elastic material.
    For the time being, only the linear elastic material is available.
   

      Contents :
      _________


      MOD1   : model object (MMODEL type)

      CHAM1  : stress or strain field (MCHAML type,
               CONTRAINTES or DEFORMATIONS subtype)

      CAR1   : field of material and/or geometrical properties
               (MCHAML type, CARACTERISTIQUES subtype)

      VAR1  : field of internal variables (MCHAML type, 
              VARIABLES INTERNES subtype) 

      CHAM2  : stress or strain field (MCHAML type,
               DEFORMATIONS or CONTRAINTES subtype)

      REMARKS : 
                In the case of endommageable and visco-endommageable materials, 
                and if the field of internal variables is given, the HOOKE's 
                matrix used for the calculation takes care of the 
                endommagement.
                In the case of strain calculation from stresses with
                beam element, one must use a material containing reduced
                sections 'SECY' and 'SECZ'. Otherwise the Hooke matrix
                is non inversible.
                In the case of strain calculation from stresses with
                pipe element, one must use a material containing 
                coefficient 'CISA'. Otherwise the Hooke matrix
                is non inversible.
                In the case of strain calculation from stresses with
                an orthotropic material in case of plane stresses
                hypothesis, one must use a material containing the
                componants 'YG3', 'NU13' and 'NU23'. Otherwise the
                Hooke matrix is non inversible.
                In the case of 3D joint elements, the operator ELAS is
                only valid in the isotropic case.