Manual pages | Cast3M

$$$$ INVA     NOTICE  CHAT      11/09/12    21:16:38     7124           
                                             DATE     11/09/12

    Operateur INVA                           Voir aussi : SIGM
    --------------                                        EPSI   
      CHAM1 CHAM2 CHAM3  =  INVA  MOD1 CHAM4 (CAR1) (MOT1) ;


    Description :
    ____________

    The INVA operator calculates the 3 invariants of a stress 
    or strain tensor field.

    The result is composed of 3 scalar fields. The support of these
    fields is the same as the CHAM4 tensor field's one.

      Contents :
      __________


      MOD1  : model object (MMODEL type)

      CHAM4 : stress or strain tensor field (MCHAML type,
              CONTRAINTES or DEFORMATIONS subtype)

      CAR1  : field of geometrical properties required for
              thin shell elements (MCHAML type, CARACTERISTIQUES
              subtype)

      CHAM1 : first invariant (the trace)
              (MCHAML type, SCALAIRE subtype)

      CHAM2 : second invariant (sum of the products 2 by 2)
              (MCHAML type, SCALAIRE subtype)

      CHAM3 : third invariant (determinant)
              (MCHAML type, SCALAIRE subtype)

      MOT1  : key word (MOT type) indicating for the shells
              where the calculation of stresses and strains is 
              requested;

              'SUPE' : on top layer
              'MOYE' : on the mid-surface (by default)
              'INFE' : on bottom layer