LinearPlasticViscoelasticNormalSpecies.cc

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#include "LinearPlasticViscoelasticNormalSpecies.h"
#include "Interactions/NormalForceInteractions/LinearPlasticViscoelasticInteraction.h"

class BaseParticle;
class BaseInteractable;

LinearPlasticViscoelasticNormalSpecies::LinearPlasticViscoelasticNormalSpecies()
{
    loadingStiffness_ = 0.0;
    unloadingStiffnessMax_ = 0.0;
    cohesionStiffness_ = 0.0;
    penetrationDepthMax_ = 0.0;
    dissipation_ = 0.0;
#ifdef DEBUG_CONSTRUCTOR
    std::cout<<"LinearPlasticViscoelasticNormalSpecies::LinearPlasticViscoelasticNormalSpecies() finished"<<std::endl;
#endif
}

LinearPlasticViscoelasticNormalSpecies::LinearPlasticViscoelasticNormalSpecies(const LinearPlasticViscoelasticNormalSpecies &p)
{
    loadingStiffness_ = p.loadingStiffness_;
    unloadingStiffnessMax_ = p.unloadingStiffnessMax_;
    cohesionStiffness_ = p.cohesionStiffness_;
    penetrationDepthMax_ = p.penetrationDepthMax_;
    dissipation_ = p.dissipation_;
#ifdef DEBUG_CONSTRUCTOR
    std::cout<<"LinearPlasticViscoelasticNormalSpecies::LinearPlasticViscoelasticNormalSpecies(const LinearPlasticViscoelasticNormalSpecies &p) finished"<<std::endl;
#endif
}

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

void LinearPlasticViscoelasticNormalSpecies::write(std::ostream& os) const
{
    os  << " loadingStiffness " << loadingStiffness_;
    os  << " maxUnloadingStiffness " << unloadingStiffnessMax_;
    os  << " cohesionStiffness " << cohesionStiffness_;
    os  << " maxPenetration " << penetrationDepthMax_;
    os  << " dissipation " << dissipation_;
}

void LinearPlasticViscoelasticNormalSpecies::read(std::istream& is)
{
    std::string dummy;
    is >> dummy >> loadingStiffness_;
    is >> dummy >> unloadingStiffnessMax_;
    is >> dummy >> cohesionStiffness_;
    is >> dummy >> penetrationDepthMax_;
    is >> dummy >> dissipation_;
}

std::string LinearPlasticViscoelasticNormalSpecies::getBaseName() const
{
    return "LinearPlasticViscoelastic";
}

void LinearPlasticViscoelasticNormalSpecies::mix(LinearPlasticViscoelasticNormalSpecies* const S, LinearPlasticViscoelasticNormalSpecies* const T)
{
    loadingStiffness_ = average(S->getLoadingStiffness(), T->getLoadingStiffness());
    unloadingStiffnessMax_ = average(S->getUnloadingStiffnessMax(), T->getUnloadingStiffnessMax());
    cohesionStiffness_ = average(S->getCohesionStiffness(), T->getCohesionStiffness());
    penetrationDepthMax_ = average(S->getPenetrationDepthMax(), T->getPenetrationDepthMax());
    dissipation_ = average(S->getDissipation(), T->getDissipation());
}

void LinearPlasticViscoelasticNormalSpecies::setPlasticParameters (Mdouble loadingStiffness, Mdouble unloadingStiffnessMax, Mdouble cohesionStiffness, Mdouble penetrationDepthMax)
{
    if (loadingStiffness <= 0 || unloadingStiffnessMax < loadingStiffness || cohesionStiffness < 0 || penetrationDepthMax < 0 || penetrationDepthMax > 1)
    {
        std::cerr << "Error: arguments of setPlasticParameters do not make sense" << std::endl;
        exit(-1);
    }
    setLoadingStiffness(loadingStiffness);
    setUnloadingStiffnessMax(unloadingStiffnessMax);
    setCohesionStiffness(cohesionStiffness);
    setPenetrationDepthMax(penetrationDepthMax);
}

Mdouble LinearPlasticViscoelasticNormalSpecies::getLoadingStiffness() const
{
    return loadingStiffness_;
}

Mdouble LinearPlasticViscoelasticNormalSpecies::getUnloadingStiffnessMax() const
{
    return unloadingStiffnessMax_;
}

Mdouble LinearPlasticViscoelasticNormalSpecies::getCohesionStiffness() const
{
    return cohesionStiffness_;
}

Mdouble LinearPlasticViscoelasticNormalSpecies::getPenetrationDepthMax() const
{
    return penetrationDepthMax_;
}

void LinearPlasticViscoelasticNormalSpecies::setLoadingStiffness(Mdouble loadingStiffness)
{
    loadingStiffness_ = loadingStiffness;
}

void LinearPlasticViscoelasticNormalSpecies::setUnloadingStiffnessMax(Mdouble unloadingStiffnessMax)
{
    unloadingStiffnessMax_ = unloadingStiffnessMax;
}

void LinearPlasticViscoelasticNormalSpecies::setCohesionStiffness(Mdouble cohesionStiffness)
{
    cohesionStiffness_ = cohesionStiffness;
}

void LinearPlasticViscoelasticNormalSpecies::setPenetrationDepthMax(Mdouble penetrationDepthMax)
{
    penetrationDepthMax_ = penetrationDepthMax;
}

Mdouble LinearPlasticViscoelasticNormalSpecies::computeTimeStep(Mdouble mass)
{
    return 0.02 * constants::pi / std::sqrt(unloadingStiffnessMax_ / (.5 * mass) - mathsFunc::square(dissipation_ /mass));
}

void LinearPlasticViscoelasticNormalSpecies::setDissipation(Mdouble dissipation)
{
    if (dissipation >= 0)
    {
        dissipation_ = dissipation;
    }
    else
    {
        std::cerr << "Error in setDissipation(" << dissipation << ")" << std::endl;
        exit(-1);
    }
}

void LinearPlasticViscoelasticNormalSpecies::setLoadingStiffnessAndDissipation(helpers::KAndDisp new_)
{
    setLoadingStiffness(new_.k);
    setDissipation(new_.disp);
}

Mdouble LinearPlasticViscoelasticNormalSpecies::getDissipation() const
{
    return dissipation_;
}

void LinearPlasticViscoelasticNormalSpecies::setCollisionTimeAndRestitutionCoefficient(Mdouble tc, Mdouble eps, Mdouble mass)
{
    if (eps==0.0) {
        loadingStiffness_ = .5 * mass * mathsFunc::square(constants::pi / tc);
        dissipation_ = std::sqrt(2.0 * mass * loadingStiffness_);
    } else {
        dissipation_ = -mass / tc * std::log(eps);
        loadingStiffness_ = .5 * mass * (mathsFunc::square(constants::pi / tc) + mathsFunc::square(dissipation_ / mass));
    }
    unloadingStiffnessMax_ = loadingStiffness_;
}

void LinearPlasticViscoelasticNormalSpecies::setStiffnessAndRestitutionCoefficient(Mdouble stiffness, Mdouble eps, Mdouble mass)
{
    loadingStiffness_ = stiffness;
    if (eps==0.0) {
        dissipation_ = std::sqrt(2.0 * mass * stiffness);
    } else {
        dissipation_ = -std::sqrt(2.0 * mass * stiffness / (constants::sqr_pi + mathsFunc::square(log(eps)))) * log(eps);
    }
}

Mdouble LinearPlasticViscoelasticNormalSpecies::getCollisionTime(Mdouble mass)
{
    if (mass <= 0)
    {
        std::cerr << "Error in getCollisionTime(" << mass << ") mass is not set or has an unexpected value, (getCollisionTime(" << mass << "))" << std::endl;
        exit(-1);
    }
    if (loadingStiffness_ <= 0)
    {
        std::cerr << "Error in getCollisionTime(" << mass << ") stiffness=" << loadingStiffness_ << " is not set or has an unexpected value, (getCollisionTime(" << mass << "), with stiffness=" << loadingStiffness_ << ")" << std::endl;
        exit(-1);
    }
    if (dissipation_ < 0)
    {
        std::cerr << "Error in getCollisionTime(" << mass << ") dissipation=" << dissipation_ << " is not set or has an unexpected value, (getCollisionTime(" << mass << "), with dissipation=" << dissipation_ << ")" << std::endl;
        exit(-1);
    }
    Mdouble tosqrt = loadingStiffness_ / (.5 * mass) - mathsFunc::square(dissipation_ / mass);
    if (tosqrt <= -1e-8*loadingStiffness_ / (.5 * mass))
    {
        std::cerr << "Error in getCollisionTime(" << mass << ") values for mass, stiffness and dissipation would "
        "lead to an overdamped system: reduce dissipation." << std::endl;
        exit(-1);
    }
    return constants::pi / std::sqrt(tosqrt);
}