RoundedMohrCoulomb01YieldSurface.h

// -*-c++-*-
//----------------------------------------------------------------------------
//  XC program; finite element analysis code
//  for structural analysis and design.
//
//  Copyright (C)  Luis C. 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/>.
//----------------------------------------------------------------------------
//================================================================================
//# COPY LEFT and RIGHT:                                                      #
//# Commercial    use    of    this  program without express permission of the#
//# University  of  California, is strictly encouraged. Copyright and Copyleft#
//# are covered by the following clause:                                      #
//#                                                                           #
//# Woody's license:                                                          #
//# ``This    source    code is Copyrighted in U.S., by the The Regents of the#
//# University  of  California,  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.'' bj               #
//#                                                                           #
//#                                                                           #
//#                                                                           #
//# PROJECT:           Object Oriented Finite Element Program                 #
//# PURPOSE:           Rounded Mohr Coulomb Potential Surface                 #
//# CLASS:             RoundedMohrCoulomb01YieldSurface                                      #
//#                                                                           #
//# VERSION:                                                                  #
//# LANGUAGE:          C++                                                    #
//# TARGET OS:         DOS || UNIX || . . .                                   #
//# DESIGNER(S):       Boris Jeremic jeremic@ucdavis.edu                      #
//#                    Zhao Cheng,                                            #
//# PROGRAMMER(S):     Zhao Cheng, Boris Jeremic                              #
//#                                                                           #
//#                                                                           #
//# DATE:              12 Feb. 2003                                           #
//# UPDATE HISTORY:                                                           #
//#                                                                           #
//#                                                                           #
//#                                                                           #
//#                                                                           #
//# SHORT EXPLANATION: Functions for rounded Mohr-Coulomb yield function      #
//#                                                                           #
//=============================================================================

#ifndef RoundedMohrCoulomb01YieldSurface_H
#define RoundedMohrCoulomb01YieldSurface_H


#include "material/nD/template_3d_ep/YieldSurface.h"


namespace XC {
class RoundedMohrCoulomb01YieldSurface: public YieldSurface
  {
  public:
    YieldSurface *getCopy(void) const; //create a clone of itself
    
    RoundedMohrCoulomb01YieldSurface ( ) {}    // Default constructor
    virtual ~RoundedMohrCoulomb01YieldSurface() {}     // Destructor

    double f(const EPState *EPS) const;
    BJtensor dFods(const EPState *EPS) const;

    // Redefine 1st derivative of F over scalar internal variables
    double xi_s1( const EPState *EPS ) const;
    double xi_s2( const EPState *EPS ) const;

    // Redefine 1st derivative of F over tensorial internal variables
//    tensor xi_t1(const EPState *EPS) const;

    virtual void print(std::ostream &os) const;  
  };
 
} // end of XC namespace

#endif