My title

00001 /* ****************************************************************** **
00002 **    OpenSees - Open System for Earthquake Engineering Simulation    **
00003 **          Pacific Earthquake Engineering Research Center            **
00004 **                                                                    **
00005 **                                                                    **
00006 ** (C) Copyright 1999, The Regents of the University of California    **
00007 ** All Rights Reserved.                                               **
00008 **                                                                    **
00009 ** Commercial use of this program without express permission of the   **
00010 ** University of California, Berkeley, is strictly prohibited.  See   **
00011 ** file 'COPYRIGHT'  in main directory for information on usage and   **
00012 ** redistribution,  and for a DISCLAIMER OF ALL WARRANTIES.           **
00013 **                                                                    **
00014 ** Developed by:                                                      **
00015 **   Frank McKenna (fmckenna@ce.berkeley.edu)                         **
00016 **   Gregory L. Fenves (fenves@ce.berkeley.edu)                       **
00017 **   Filip C. Filippou (filippou@ce.berkeley.edu)                     **
00018 **                                                                    **
00019 ** ****************************************************************** */
00020                                                                         
00021 // $Revision: 1.1.1.1 $
00022 // $Date: 2000/09/15 08:23:22 $
00023 // $Source: /usr/local/cvs/OpenSees/SRC/material/uniaxial/HardeningMaterial.h,v $
00024                                                                         
00025                                                                         
00026 #ifndef HardeningMaterial_h
00027 #define HardeningMaterial_h
00028 
00029 // File: ~/material/HardeningMaterial.h
00030 //
00031 // Written: MHS
00032 // Created: May 2000
00033 // Revision: A
00034 //
00035 // Description: This file contains the class definition for 
00036 // HardeningMaterial.  HardeningMaterial provides the abstraction
00037 // for a one-dimensional rate-independent plasticity model
00038 // with combined isotropic and kinematic hardening.
00039 //
00040 //
00041 // What: "@(#) HardeningMaterial.h, revA"
00042 
00043 #include <UniaxialMaterial.h>
00044 
00046 class HardeningMaterial : public UniaxialMaterial
00047 {
00048   public:
00050     HardeningMaterial(int tag, double E, double sigmaY, double K, double H);
00052  HardeningMaterial();
00054     ~HardeningMaterial();
00055 
00057     int setTrialStrain(double strain, double strainRate = 0.0); 
00059     double getStrain(void);          
00061     double getStress(void);
00063     double getTangent(void);
00065     double getSecant (void);
00066 
00068     int commitState(void);
00070     int revertToLastCommit(void);    
00072     int revertToStart(void);        
00073 
00075     UniaxialMaterial *getCopy(void);
00076     
00078     int sendSelf(int commitTag, Channel &theChannel);  
00080     int recvSelf(int commitTag, Channel &theChannel, 
00081    FEM_ObjectBroker &theBroker);    
00082     
00084     void Print(ostream &s, int flag =0);
00085     
00086   protected:
00087     
00088   private:
00090     double E; 
00091     double sigmaY; 
00092     double K; 
00093     double H; // Kinematic hardening parameter
00094  
00096     double Tstrain; 
00097     double Tstress; 
00098     double Ttangent; 
00099     double TplasticStrain; 
00100     double TbackStress; 
00101     double Thardening; // Trial internal hardening variable
00102  
00104     double Cstrain; 
00105     double CplasticStrain; 
00106     double CbackStress; 
00107     double Chardening; // Committed internal hardening variable
00108 };
00109 
00110 
00111 #endif
00112 
00113 ÿ