CompressibleMooneyRivlinMaterialLaw.hpp

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*/


#ifndef COMPRESSIBLEMOONEYRIVLINMATERIALLAW_HPP_
#define COMPRESSIBLEMOONEYRIVLINMATERIALLAW_HPP_

#include "AbstractIsotropicCompressibleMaterialLaw.hpp"
#include "Exception.hpp"

template<unsigned DIM>
class CompressibleMooneyRivlinMaterialLaw : public AbstractIsotropicCompressibleMaterialLaw<DIM>
{
private:

    double mC1;

    double mC3;

    static const double msMinusOneOverDimension;

public:

    double Get_dW_dI1(double I1, double I2, double I3)
    {
        return mC1 * pow(I3, msMinusOneOverDimension);
    }

    double Get_dW_dI2(double I1, double I2, double I3)
    {
        return 0.0;
    }

    double Get_dW_dI3(double I1, double I2, double I3)
    {
        return     mC1*I1*msMinusOneOverDimension*pow(I3,msMinusOneOverDimension - 1)
                +  mC3*(1 - pow(I3,-0.5));
    }

    double Get_d2W_dI1(double I1, double I2, double I3)
    {
        return 0.0;
    }


    double Get_d2W_dI2(double I1, double I2, double I3)
    {
        return 0.0;
    }


    double Get_d2W_dI3(double I1, double I2, double I3)
    {
        return    mC1*I1*msMinusOneOverDimension*(msMinusOneOverDimension - 1)*pow(I3,msMinusOneOverDimension - 2)
                + 0.5*mC3*pow(I3,-1.5);
    }

    double Get_d2W_dI2I3(double I1, double I2, double I3)
    {
        return 0.0;
    }


    double Get_d2W_dI1I3(double I1, double I2, double I3)
    {
        return mC1*msMinusOneOverDimension*pow(I3,msMinusOneOverDimension-1);
    }


    double Get_d2W_dI1I2(double I1, double I2, double I3)
    {
        return 0.0;
    }


    double GetC1()
    {
        return mC1;
    }

    double GetC3()
    {
        return mC3;
    }

    CompressibleMooneyRivlinMaterialLaw(double c1, double c3)
    {
        assert(c1 > 0.0);
        assert(c3 > 0.0);
        mC1 = c1;
        mC3 = c3;
    }

    void ScaleMaterialParameters(double scaleFactor)
    {
        assert(scaleFactor > 0.0);
        mC1 /= scaleFactor;
        mC3 /= scaleFactor;
    }
};

template<unsigned DIM>
const double CompressibleMooneyRivlinMaterialLaw<DIM>::msMinusOneOverDimension = -1.0/DIM;

#endif /*COMPRESSIBLEMOONEYRIVLINMATERIALLAW_HPP_*/