DP_PS01.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.
//
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//  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):     :-))                                                      #
//# PROJECT:           Object Oriented Finite Element Program                    #
//# PURPOSE:           Manzari-Dafalias potential criterion(with Pc)             #
//# CLASS:             DPPotentialSurface01                                      #
//#                                                                              #
//# VERSION:                                                                     #
//# LANGUAGE:          C++.ver >= 2.0 ( Borland C++ ver=3.00, SUN C++ ver=2.1 )  #
//# TARGET OS:         DOS || UNIX || . . .                                      #
//# PROGRAMMER(S):     Boris Jeremic, Zhaohui Yang                               #
//#                                                                              #
//#                                                                              #
//# DATE:              August 08 '00                                             #
//# UPDATE HISTORY:    December 13 '00                                           #
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//# SHORT EXPLANATION:                                                           #
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//================================================================================
//

#ifndef DP_PS01_H    
#define DP_PS01_H

#include "material/nD/Template3Dep/PS.h"

namespace XC {
//
class MDPotentialSurface : public PotentialSurface
  {
  public:
    PotentialSurface *newObj();  //create a colne of itself
    MDPotentialSurface();        // Default constructor

    tensor dQods(const EPState *EPS) const; 
    tensor d2Qods2(const EPState *EPS) const ;   

    //aux. functions for d2Qods2
    tensor dnods(const EPState *EPS) const;
    tensor dthetaoverds(const EPState *EPS) const;
    double dgoverdt(double theta, double c) const;
    tensor dpqdnods(const EPState *EPS) const;
    
    void print() { std::clog << *this; };

    //================================================================================
    // Overloaded Insertion Operator
    // prints an PotentialSurface's contents 
    //================================================================================
    friend std::ostream& operator<<(std::ostream &, const MDPotentialSurface &);
  };

inline std::ostream& operator<<(std::ostream &os, const MDPotentialSurface &PS)
  {
    os << "Manzari-Dafalias Potential Surface Parameters: " << std::endl;
    return os;
  }
} // end of XC namespace

#endif