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$$$$ RAMBERG  NOTICE  CHAT      11/09/12    21:17:50     7124           
                                             DATE     11/09/12
                                             
  Procedure RAMBERG                        Voir aussi :
    ------------------   
        RAMBERG TAB1;

               TAB1.'COURBE_TRACTION'.'SIG0'.'EPS0'
                   .'ALPHA'.'N'.'COUBE_RAMBERG'
                   .'AJUSTEMENT'


   
    Description :
    _____________
 
         The stress-strain curve for a material being given, this 
      procedur allows to adjust a Ramberg-Osgood law on this curve :
            eps/eps0 = (sig/sig0) + (alpha * ((sig/sig0)**n))
      This ajustement is done using a linear regression of the
      stress-strain curve points in log-log coordinates.

   Contents :
   __________

        INPUTS :
       ----------      

       TAB1.'COURBE_TRACTION' : stress-strain curve ('EVOLUTION' type)
                                with strains in abscissa and stresses
                                in ordinate (the first points must have 
                                a plastic part)

       TAB1.'SIG0' : stress value in Ramberg-Osgood law

       TAB1.'EPS0' : strain corresponding to SIG0 in the Ramberg-Osgood
                     law


        OUTPUTS :
      ------------

       TAB1.'ALPHA' : alpha coeficient in the Ramberg-Osgood law

       TAB1.'N' : hardening parameter in the Ramberg-Osgood law

       TAB1.'COURBE_RAMBERG' : adjusted Ramberg-Osgood law (EVOLUTION 
                               type)

       TAB1.'AJUSTEMENT' : adjustement coefficient using the linear
                           regression (AJUSTEMENT = 1 for a perfect
                           adjustement.