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$$$$ @CLPD    NOTICE  CHAT      11/09/12    21:15:29     7124           
                                             DATE     11/09/12

    Procedure @CLPD            Voir aussi: @CLIM, @KEFF, KEFFT
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        RIG1 F1 = @CLPD MAIL0 TAB1;
    
    Auteurs:   L. GELEBART (CEA Saclay DEN/DMN/SRMA)
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    Date :     10/2006
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    Exemple associe :     test_AMITEX.dgibi
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    Contact :   lionel(dot)gelebart(at)cea(dot)fr
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    Purpose :
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    This procedure allows to build the stiffness matrix and the
    nodal forces associated to a set of periodic boundary
    conditions with a prescribed mean strain.
    
    Comments :
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    MAIL0 : Periodic mesh defined in a square parallelepiped
            volume (MAILLAGE)
    TAB1  : Applied mean strain (TABLE) according to :
               TAB1.1 = EXX, 
               TAB1.2 = EYY, 
               TAB1.3 = EZZ, 
               TAB1.4 = EXY, 
               TAB1.5 = EXZ, 
               TAB1.6 = EYZ,
    RIG1  : Stiffness matrix (RIGIDITE)
    F1    : Nodal forces (CHPOINT)  
               
    Remarques :
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       Meshes of opposites surface must superimpose
       This preocedure works even if porosities are connected
       to the parallelepiped boundary of the volume element