isotropic_damage_utilities.hpp

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//
//   Project Name:        KratosSolidMechanicsApplication $
//   Created by:          $Author:              IPouplana $
//   Last modified by:    $Co-Author:                     $
//   Date:                $Date:                July 2015 $
//   Revision:            $Revision:                  0.0 $
//
//
 
#if !defined(KRATOS_ISOTROPIC_DAMAGE_UTILITIES_H_INCLUDED)
#define  KRATOS_ISOTROPIC_DAMAGE_UTILITIES_H_INCLUDED
 
 
/* System includes */
#include <cmath>
 
namespace Kratos
{
 
class IsotropicDamageUtilities
{
public:
    static inline void ComputePerturbationVector( Vector& rPerturbationVector, const Vector& InputVector )
    {
        const unsigned int VSize = InputVector.size();
        if(rPerturbationVector.size() != VSize)
            rPerturbationVector.resize(VSize,false);
 
        const double MinTol = 1.0e-10;
        const double MaxTol = 1.0e-5;
 
        //Maximum and minimum vector components
        double max_component = fabs(InputVector[0]) , min_component = fabs(InputVector[0]);
 
        for( unsigned int i=1; i<VSize; i++ )
        {
            if( fabs(InputVector[i]) < min_component )
            {
                min_component = fabs(InputVector[i]);
            }
            else if( fabs(InputVector[i]) > max_component )
            {
                max_component = fabs(InputVector[i]);
            }
        }
 
        double aux = min_component*MaxTol;
 
        if( aux < (max_component*MinTol) )
        {
            aux = max_component*MinTol;
        }
 
        //PerturbationVector
        for( unsigned int i=0; i<VSize; i++ )
        {
            if( fabs(InputVector[i]) > 1.0e-20 ) // different from zero
            {
                rPerturbationVector[i] = InputVector[i]*MaxTol;
            }
            else if( InputVector[i] >= 0.0 )
            {
                rPerturbationVector[i] = aux;
            }
            else
            {
                rPerturbationVector[i] = -aux;
            }
        }
    }
 
 
}; /* Class IsotropicDamageUtilities */
} /* namespace Kratos.*/
 
#endif /* KRATOS_ISOTROPIC_DAMAGE_UTILITIES_H_INCLUDED defined */