LogPenalty.h

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#pragma once
 
#include "LinearElasticIsotropic.h"
 
namespace MaterialLib
{
namespace Fracture
{
inline double logPenaltyDerivative(double const aperture0,
                                   double const aperture,
                                   double const aperture_cutoff)
{
    if (aperture >= aperture0)
    {
        return 1;
    }
 
    // Logarithmic penalty
    if (aperture > aperture_cutoff)
    {
        double const penalty = std::log(aperture / aperture0);
        return 1 + penalty * penalty +
               2 * penalty / aperture * (aperture - aperture0);
    }
 
    // Linear penalty below aperture cutoff
    {
        double const penalty = std::log(aperture_cutoff / aperture0);
        return 1 + penalty * penalty +
               2 * penalty / aperture_cutoff *
                   (2 * aperture - aperture_cutoff - aperture0);
    }
};
 
inline double logPenalty(double const aperture0,
                         double const aperture,
                         double const aperture_cutoff)
{
    if (aperture >= aperture0)
    {
        return 1;
    }
 
    // Logarithmic penalty
    if (aperture > aperture_cutoff)
    {
        double const penalty = std::log(aperture / aperture0);
        return 1 + penalty * penalty;
    }
 
    // Linear penalty below aperture cutoff
    {
        double const penalty = std::log(aperture_cutoff / aperture0);
        return 1 + penalty * penalty +
               2 * penalty / aperture_cutoff * (aperture - aperture_cutoff);
    }
};
}  // namespace Fracture
}  // namespace MaterialLib