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$$$$ WORK     NOTICE  CHAT      11/09/12    21:18:34     7124           
                                             DATE     11/09/12

  Operateur WORK                           Voir aussi :
    --------------   
    WORK1  =  WORK MODL1  SIG1  GRAD1  (GRAF1) ;


    Description :
    _____________

    The WORK operator calculates the trace of the tensorial
    product of both a stress field SIG1 and a gradient field
    GRAD1 (and a bending gradient field GRAF1 for the shell
    elements), i.e.

           WORK1  = Tr (SIG1 * GRAD1)


    Contents :
    ___________

     MODL1 : model object (MMODEL type)

     SIG1  : stress field (MCHAML type, CONTRAINTES subtype)

     GRAD1 : gradient field (MCHAML type)

     GRAF1 : bending gradient field (MCHAML type)

     WORK1 : MCHAML type object

   Note:
   -------

  The bending gradient field (required only for thin shell
 elements) is given at the end of the list of the operator
 syntax.