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$$$$ CTOD     NOTICE  CHAT      11/09/12    21:15:41     7124           
                                             DATE     11/09/12
                                             
  Procedure CTOD                            Voir aussi :
    --------------   
    CTOD   DEP1  TAB1 ;

                        TAB1.'FRTFISS'
                            .'LIFIS1'
                            .'MAILLAGE' .'PFS1'



    Description :
    _____________

    This procedure calculates the tip opening of a crack loaded
    in mode I and defined in extended plasticity as twice the
    displacement of the crack side at the point of intersection
    with the 45 degree-straight line.
    The procedure applies to 2 and 3D cases.
    In 3D, the crack opening is defined at each apex-node of the
    crack front from the opening in the plane which is normal to the
    crack front at the considered node.
    (before working out the mesh, make sure that you will have these
    planes normal to the crack front)

    Contents :
    __________

    Input data :
    ____________

    DEP1  : Displacement field

    TAB1  : TABLE type object indexed by words, used for
            defining the calculation parameters and options

      Arguments for a two-dimensional problem
      _________________________________________

       index       pointed type          comments
                      object

      FRTFISS        POINT        crack tip

      LIFIS1         MAILLAGE     line describing the crack side


      Arguments for a three-dimensional problem
      _________________________________________


       index       pointed type          comments
                      object


      FRTFISS        MAILLAGE     line describing the crack front

      PSF1           POINT        one point of the crack surface
                                  that does not pertain to the front

      Output data :
      _____________

      On output, TAB1 makes it possible to recover the values
      of the crack opening.

      index       pointed type          comments
                      object

      CTOD         FLOTTANT/TABLE   in 2D, floating: CTOD value
                                    in 3D, table containing the CTOD
                                    values at each node of the front

      Example : in order to list CTOD value calculated at node P15 of
                the crack front, code : LIST (TAB1.CTOD.P15 )