AnisotropicHookean.h

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#ifndef MERCURYDPM_ANISOTROPICHOOKEAN_H
#define MERCURYDPM_ANISOTROPICHOOKEAN_H
#include "constitutive_laws.h"
 
namespace oomph
{
 
class AnisotropicHookean : public oomph::GeneralisedHookean
{
    std::array<double, 3> anisotropy_ { 1.0, 1.0, 1.0 };
 
public:
 
    void setAnisotropy(std::array<double, 3> anisotropy) {
        anisotropy_ = anisotropy;
    }
 
    AnisotropicHookean( double* nu_pt, double* e_pt )
        : GeneralisedHookean( nu_pt, e_pt ) {}
 
    //=====================================================================
    //=====================================================================
    void calculate_second_piola_kirchhoff_stress(
        const DenseMatrix<double>& g,
        const DenseMatrix<double>& G,
        DenseMatrix<double>& sigma)
    {
        GeneralisedHookean::calculate_second_piola_kirchhoff_stress(g, G, sigma);
 
        // Make anisotropic
        const unsigned dim = sigma.nrow();
        for (unsigned i = 0; i < dim; i++)
        {
            for ( unsigned j = 0; j < dim; j++ )
            {
                sigma( i, j) *= anisotropy_[i];
            }
        }
 
        // Symmetrize
        for (unsigned i = 0; i < dim; i++)
        {
            for (unsigned j = 0; j < i; j++)
            {
                sigma(i, j) = sigma(j, i);
            }
        }
    }
};
}
 
#endif//MERCURYDPM_ANISOTROPICHOOKEAN_H