J:/Tecgraf/prj/femoop/trunk/elc/elcasp2d.h

// -------------------------------------------------------------------------
// ElcASP2D.h - This header file contains data structure for axisymmetric
//              parametric degenerated shell finite element.
// -------------------------------------------------------------------------
//
// $Author: joaquim $
// $Revision: 1.1 $
// $Date: 1998/02/16 20:21:11 $
// $State: Exp $
//
// -------------------------------------------------------------------------
// Description:
// This file contains the data structure necessary to implement
// the Parametric Degenerated Axisymmetric Shell Element. The 
// integrations along the thickness are not made prior to the
// assemblage procedures, so that a 2-dimensional integration
// scheme must be used.
//
// Reference:
// Weaver & Johnston, "Finite Elements for Structural Analysis", p. 257
// Remarks:
//
//
// -------------------------------------------------------------------------

#ifndef  _ELCASP2D_H
#define  _ELCASP2D_H

#include "gbldefs.h"
#include "element.h"
#include "elcaxsh.h"

// -------------------------------------------------------------------------
// Definition of a Parametric Axisymmetric 2D Shell Element Class:

class cElcAxShPar2D : public cElcAxShell
{
 protected:
         sVector   *_sTgVec;      // tangent unitary vectors at nodes
         double    *_dNodThick;   // nodal thicknesses

 public:
                    cElcAxShPar2D     ( eShapeType );
  virtual          ~cElcAxShPar2D     ( void ); 
           void     CreateElement     ( eShapeType );
           void     Stiffness         ( double * );
           void     CalcIntPtStress   ( void ); 
           int      InternalForce     ( double * );

 protected:
           void     BMatrix           ( sNatCoord *, double **,
                                        double *, sDerivNat *,
                                        double, double ** );
           void     TMatrix           ( sVector, double ** );

};
                                        
#endif

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