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ENTMaterial.h

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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: 1.6 $
00022 // $Date: 2006/09/05 22:19:04 $
00023 // $Source: /usr/local/cvs/OpenSees/SRC/material/uniaxial/ENTMaterial.h,v $
00024                                                                         
00025                                                                         
00026 #ifndef ENTMaterial_h
00027 #define ENTMaterial_h
00028 
00029 // Written: fmk 
00030 // Created: 07/98
00031 // Revision: A
00032 //
00033 // Description: This file contains the class definition for 
00034 // ENTMaterial. ENTMaterial provides the abstraction
00035 // of an viscoelastic uniaxial material,
00036 // i.e. stress = E*strain + eta*strainrate
00037 //
00038 //
00039 // What: "@(#) ENTMaterial.h, revA"
00040 
00041 #include <UniaxialMaterial.h>
00042 
00043 class ENTMaterial : public UniaxialMaterial
00044 {
00045   public:
00046     ENTMaterial(int tag, double E);    
00047     ENTMaterial();    
00048     ~ENTMaterial();
00049 
00050     const char *getClassType(void) const {return "ENTMaterial";};
00051 
00052     int setTrialStrain(double strain, double strainRate = 0.0); 
00053     double getStrain(void);
00054     double getStress(void);
00055     double getTangent(void);
00056     double getInitialTangent(void) {return E;};
00057 
00058     int commitState(void);
00059     int revertToLastCommit(void);    
00060     int revertToStart(void);        
00061 
00062     UniaxialMaterial *getCopy(void);
00063     
00064     int sendSelf(int commitTag, Channel &theChannel);  
00065     int recvSelf(int commitTag, Channel &theChannel, 
00066                  FEM_ObjectBroker &theBroker);    
00067     
00068     void Print(OPS_Stream &s, int flag =0);
00069     
00070     int setParameter(const char **argv, int argc, Parameter &param);
00071     int updateParameter(int parameterID, Information &info);
00072 
00073   protected:
00074     
00075   private:
00076     double E;
00077     double trialStrain;
00078 };
00079 
00080 
00081 #endif
00082

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