EvolutionLaw_LEij.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/>.
//----------------------------------------------------------------------------

//============================================================================
// COPYRIGHT (C):     :-))                                                    
// PROJECT:           Object Oriented Finite Element Program                  
// PURPOSE:           General platform for elaso-plastic constitutive model   
//                    implementation                                          
//                                                                            
// CLASS:             EvolutionLaw_L_Eij (linear tensorial Evolution law)     
//                                                                            
//                                                                            
// VERSION:                                                                   
// LANGUAGE:          C++.ver >= 2.0 ( Borland C++ ver=3.00, SUN C++ ver=2.1 )
// TARGET OS:         DOS || UNIX || . . .                                    
// DESIGNER(S):       Boris Jeremic, Zhaohui Yang                             
// PROGRAMMER(S):     Boris Jeremic, Zhaohui Yang                             
//                                                                            
//                                                                            
// DATE:              09-13-2000                                              
// UPDATE HISTORY:                                                            
//                                                                            
//                                                                            
//                                                                            
//                                                                            
// SHORT EXPLANATION: This is a linear evolution law for the evoltion of a    
//                    tensorial variable alpha which depends on plastic strain
//                    i.e. dalpha = a * de_ij                                 
//                                                                            
//============================================================================

#ifndef EvolutionLaw_LEij_H
#define EvolutionLaw_LEij_H

#include <cmath>
#include "material/nD/template_3d_ep/EvolutionLaw_T.h"

namespace XC {
class EvolutionLaw_L_Eij: public EvolutionLaw_T
  {
  // Private vars to define the evolution law
  private:
    double  a; 
  public:    
    EvolutionLaw_L_Eij( double ad = 10.0);                
    EvolutionLaw_L_Eij(const EvolutionLaw_L_Eij &LEL );   // Copy constructor
    
    EvolutionLaw_T *getCopy(void) const; // create a clone of itself
    
    BJtensor h_t( EPState *EPS, PotentialSurface *PS);    // Evaluating hardening function h
    
    virtual void print(std::ostream &) const;

    // some accessor functions
    double geta() const; // Linear coefficient used to evolve internal var
    void seta(double ad);
  };
} // end of XC namespace


#endif