shells/materials/j2Plasticity/J2Plasticity.h

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/* -*- C++ -*- */
/*
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 *
 *                                   Fehmi Cirak
 *                        California Institute of Technology
 *                           (C) 2005 All Rights Reserved
 *
 * <LicenseText>
 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*/
#ifndef J2PLASTICITY_H
#define J2PLASTICITY_H

#include "../MaterialBase.h"

#include <cassert>

namespace shells {

class J2Plasticity : public MaterialBase {
private:
    J2Plasticity(); // use createMaterial instead
    void computeMaterialParameters();
    
public:
    ~J2Plasticity();
    
    void updateStress(double * const stress, 
                      double const * const gstrain, 
                      double const dtime = 0.0,
                      double * const history=NULL,
                      double const * const gstrainPrv=NULL);     

    double density();    
    double estimatedElasticityConst();

    void initialization(double * history);
    
    static MaterialBase * createMaterial() {
        return new J2Plasticity();
    }
    
private:
    static const int _numberMaterialParameters = 19;
    static const int _numberInternalVariables = 13; // 4 history vars + 9 F comps
    static const int _nonstrainHistoryVar = 4; 
    
    double _materialParameters[_numberMaterialParameters];
    double _internalVariables[_numberInternalVariables];
    
    double _massDensity;
    double _youngModulus;
    double _poissonRatio;
    double _yieldStress;
    double _referencePlasticStrain;
    double _hardeningExponent;
    double _referencePlasticStrainRate;
    double _rateSensitivityExponent;
    double _referenceTemperature;
    double _meltingTemperature;  
    double _thermalSofteningCoeff;
    double _taylorQuinneyCoeff;
};

}


// inlined functions
inline double shells::J2Plasticity::density()
{
    return _massDensity;
}


inline double shells::J2Plasticity::estimatedElasticityConst()
{
    return _youngModulus;
}

#endif // J2PLASTICITY_H

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