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

// -------------------------------------------------------------------------
// ElcAxShP.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 all made prior to the
// assemblage procedures, so that a 1-dimensional integration
// scheme may be used.
// Reference:
// Weaver & Johnston, "Finite Elements for Structural Analysis", p. 257
// Remarks:
// This implementation admits two possibilities for the nodal
// thicnesses and nodal vectors.
// The user may specify the thickness at the nodes by means
// of the neutral file, using the "NODE.THICKNESS" label. If not,
// the thickness at all nodes is assumed to be constant and is
// retrieved from element information.
// The user may specify the nodal "normal" vectors int the neutral
// file, using the "NODE.VECTOR" label. If not, the normal vector
// will be evaluated at all nodes and whenever necessary using
// the shape functions. This may result in adjacent elements which
// overlap. 
// -------------------------------------------------------------------------

#ifndef  _ELCAXSHP_H
#define  _ELCAXSHP_H

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

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

class cElcAxShPar : public cElcAxShell
{
 protected:
         sVector   *_sTgVec;      // tangent unitary vectors at nodes
         double    *_dNodThick;   // nodal thicknesses
 public:
                    cElcAxShPar       ( eShapeType );
  virtual          ~cElcAxShPar       ( void );
           void     CreateElement     ( eShapeType ); 
  virtual  void     Stiffness         ( double * );
  virtual  void     CalcIntPtStress   ( void ) ; 
  virtual  int      InternalForce     ( double * );
           double   GetVol            ( void );
 protected:
           void     TMatrix           ( sVector, double **);
           void     BaMatrix          ( double **, double *, sDerivNat *,
                                        double, double **);
           void     BbMatrix          ( double **, double *, sDerivNat *,
                                        double, double **);
};

#endif

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