LinearViscoelasticInteraction.cc

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//Copyright (c) 2013-2014, The MercuryDPM Developers Team. All rights reserved.
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#include "LinearViscoelasticInteraction.h"
#include "Species/NormalForceSpecies/LinearViscoelasticNormalSpecies.h"
#include "BaseInteractable.h"
#include "InteractionHandler.h"
#include <iomanip>
#include <fstream>
LinearViscoelasticInteraction::LinearViscoelasticInteraction(BaseInteractable* P, BaseInteractable* I, Mdouble timeStamp)
        : BaseInteraction(P, I, timeStamp)
{
#ifdef DEBUG_CONSTRUCTOR
    std::cout<<"LinearViscoelasticInteraction::LinearViscoelasticInteraction() finished"<<std::endl;
#endif
}
LinearViscoelasticInteraction::LinearViscoelasticInteraction(const LinearViscoelasticInteraction& p)
        : BaseInteraction(p)
{
#ifdef DEBUG_CONSTRUCTOR
    std::cout<<"LinearViscoelasticInteraction::LinearViscoelasticInteraction(const LinearViscoelasticInteraction& p) finished"<<std::endl;
#endif
}

LinearViscoelasticInteraction::~LinearViscoelasticInteraction()
{
#ifdef DEBUG_DESTRUCTOR
    std::cout<<"LinearViscoelasticInteraction::~LinearViscoelasticInteraction() finished"<<std::endl;
#endif
}

void LinearViscoelasticInteraction::write(std::ostream& os) const
{
    BaseInteraction::write(os);
}
void LinearViscoelasticInteraction::read(std::istream& is)
{
    BaseInteraction::read(is);
}
std::string LinearViscoelasticInteraction::getBaseName() const
{
    return "LinearViscoelastic";
}
void LinearViscoelasticInteraction::computeNormalForce()
{
    // Compute the relative velocity vector of particle P w.r.t. I
    setRelativeVelocity(getP()->getVelocityAtContact(getContactPoint()) - getI()->getVelocityAtContact(getContactPoint()));
    // Compute the projection of vrel onto the normal (can be negative)
    setNormalRelativeVelocity(Vec3D::dot(getRelativeVelocity(), getNormal()));

    if (getOverlap() > 0) //if contact forces
    {
        const LinearViscoelasticNormalSpecies* species = getSpecies();

        Mdouble normalForce = species->getStiffness() * getOverlap() - species->getDissipation() * getNormalRelativeVelocity();
        setAbsoluteNormalForce(std::abs(normalForce)); //used for further corce calculations;
        setForce(getNormal() * normalForce);
        setTorque(Vec3D(0.0, 0.0, 0.0));
    }
    else
    {
        setAbsoluteNormalForce(0.0);
        setForce(Vec3D(0.0, 0.0, 0.0));
        setTorque(Vec3D(0.0, 0.0, 0.0));
    }
}
Mdouble LinearViscoelasticInteraction::getElasticEnergy() const
{
   if (getOverlap() > 0)
        return 0.5 * (getSpecies()->getStiffness() * mathsFunc::square(getOverlap()));
    else
        return 0.0;
}
const LinearViscoelasticNormalSpecies* LinearViscoelasticInteraction::getSpecies() const
{
    return dynamic_cast<const LinearViscoelasticNormalSpecies*>(getBaseSpecies());
}

Mdouble LinearViscoelasticInteraction::getElasticEnergyAtEquilibrium(Mdouble adhesiveForce) const {
    return adhesiveForce*adhesiveForce/(2.0*getSpecies()->getStiffness());
}