Subloading.h

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/*******************************************************************************
 * Copyright (C) 2017-2025 Theodore Chang
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 ******************************************************************************/
#ifndef SUBLOADING_H
#define SUBLOADING_H
 
#include <Material/Material3D/Material3D.h>
 
struct DataSubloading {
    class Saturation {
        const double rate, bound;
 
    public:
        Saturation(const double R, const double B)
            : rate(R)
            , bound(B) {}
 
        [[nodiscard]] double r() const { return rate; }
 
        [[nodiscard]] double b() const { return bound; }
 
        [[nodiscard]] double rb() const { return r() * b(); }
    };
 
    const double elastic; // elastic modulus
    const double poissons_ratio;
    const double initial_iso;
    const double k_iso;
    const double saturation_iso;
    const double m_iso;
    const double initial_kin;
    const double k_kin;
    const double saturation_kin;
    const double m_kin;
    const double u;
 
    const Saturation b;
    const Saturation c;
};
 
class Subloading final : protected DataSubloading, public Material3D {
    static constexpr unsigned max_iteration = 20u;
    static constexpr double two_third = 2. / 3.;
    static const double root_two_third;
    static constexpr double z_bound = 1E-15;
    static const double rate_bound;
    static const mat unit_dev_tensor;
 
    static vec2 yield_ratio(double);
 
    const double double_shear = elastic / (1. + poissons_ratio); // double shear modulus
 
public:
    Subloading(
        unsigned,         // tag
        DataSubloading&&, // data
        double = 0.       // density
    );
 
    int initialize(const shared_ptr<DomainBase>&) override;
 
    unique_ptr<Material> get_copy() override;
 
    int update_trial_status(const vec&) override;
 
    int clear_status() override;
    int commit_status() override;
    int reset_status() override;
 
    void print() override;
};
 
#endif