NeoHookeanWEnergy.h

//----------------------------------------------------------------------------
//  XC program; finite element analysis code
//  for structural analysis and design.
//
//  Copyright (C)  Luis Claudio Pérez Tato
//
//  This program derives from OpenSees <http://opensees.berkeley.edu>
//  developed by the  «Pacific earthquake engineering research center».
//
//  Except for the restrictions that may arise from the copyright
//  of the original program (see copyright_opensees.txt)
//  XC is free software: you can redistribute it and/or modify
//  it under the terms of the GNU General Public License as published by
//  the Free Software Foundation, either version 3 of the License, or 
//  (at your option) any later version.
//
//  This software is distributed in the hope that it will be useful, but 
//  WITHOUT ANY WARRANTY; without even the implied warranty of
//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
//  GNU General Public License for more details. 
//
//
// You should have received a copy of the GNU General Public License 
// along with this program.
// If not, see <http://www.gnu.org/licenses/>.
//----------------------------------------------------------------------------
//===============================================================================
//# COPYRIGHT (C): Woody's license (by BJ):
//                 ``This    source  code is Copyrighted in
//                 U.S.,  for  an  indefinite  period,  and anybody
//                 caught  using it without our permission, will be
//                 mighty good friends of ourn, cause we don't give
//                 a  darn.  Hack it. Compile it. Debug it. Run it.
//                 Yodel  it.  Enjoy it. We wrote it, that's all we
//                 wanted to do.''
//
//# PROJECT:           Object Oriented Finite Element Program
//# PURPOSE:           Finite Deformation Hyper-Elastic classes
//# CLASS:
//#
//# VERSION:           0.6_(1803398874989) (golden section)
//# LANGUAGE:          C++
//# TARGET OS:         all...
//# DESIGN:            Zhao Cheng, Boris Jeremic (jeremic@ucdavis.edu)
//# PROGRAMMER(S):     Zhao Cheng, Boris Jeremic
//#
//#
//# DATE:              19AUg2003
//# UPDATE HISTORY:    28May2004
//#
//#
/**********************************************************************/
/*   //=============================================================  */
/*   ==================                                               */
/**********************************************************************/

#ifndef NeoHookeanWEnergy_H
#define NeoHookeanWEnergy_H

#include "WEnergy.h"


namespace XC {
//
class NeoHookeanWEnergy : public WEnergy
  {
  private:
    double K;
    double G;
  public:
    NeoHookeanWEnergy(double , double  );
    NeoHookeanWEnergy( );

    WEnergy *getCopy(void) const;

     const double wE(const double &, const Vector &)  ;
     const Vector disowOdlambda(const Vector &l)  ;
     const Vector d2isowOdlambda2(const Vector &)  ;
//   const tensor d2isowOdlambda1dlambda2(const Vector &) const ;
     const double dvolwOdJ(const double &)  ;
     const double d2volwOdJ2(const double &)  ;
  };
} // end of XC namespace

#endif