J:/Tecgraf/prj/femoop/trunk/elc/elcmitc4.h

// -------------------------------------------------------------------------
// ElcMITC4.h - This header file contains the data structure for the 
//              implementation of the Dvorkin-Bathe 4-noded shell
//              element, hereby called MITC4.
//              
// ------------------------------------------------------------------------
// Remarks:
//             
// ------------------------------------------------------------------------
// Reference: "A continuum mechanics based four node shell element for
//             general nonlinear analysis", E.N.Dvorkin & K.J.Bathe,
//             Eng.Comput.,1,77-78(1984)
// ------------------------------------------------------------------------
//
// $Author: evandro $
// $Revision: 1.1 $
// $Date: 1999/04/12 14:48:47 $
// $State: Exp $
//
// -------------------------------------------------------------------------

#ifndef _ELCMITC4_H 
#define _ELCMITC4_H 

#include "gbldefs.h"
#include "elcdsh3d.h"


// -------------------------------------------------------------------------
// Definition of MITC4 shell element

class cElcMITC4 : public cElcDegShell3D
{
 public:
                    cElcMITC4         ( eShapeType e );
  virtual          ~cElcMITC4         ( void ){ }
           void     Stiffness         ( double * );
           void     CalcIntPtStress   ( void );
           void     CalcIntPtStress   ( cIntPt *, sTensor * );
            int     InternalForce     ( double * );
  
 protected:
 sNatCoord PointA, PointB, PointC, PointD;

 protected:
          void      BMatrix           ( sNatCoord *, double **, double **,
                                        double *, sDerivNat *, double *,
                                        double *, double **, double ** );
          void      CalcBSamp         ( double **, double ** ); 
};

#endif

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