SimpleHysteresis.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 SIMPLEHYSTERESIS_H
#define SIMPLEHYSTERESIS_H
 
#include <Material/Material1D/Material1D.h>
 
struct DataSimpleHysteresis {
    const double middle_point;
};
 
class SimpleHysteresis : protected DataSimpleHysteresis, public Material1D {
    enum class Status {
        NONE,
        CBACKBONE,
        TBACKBONE,
        CINNER,
        TINNER
    };
 
    Status trial_flag = Status::NONE, current_flag = Status::NONE;
 
    [[nodiscard]] virtual pod2 compute_compression_initial_reverse() const = 0;
    [[nodiscard]] virtual pod2 compute_tension_initial_reverse() const = 0;
 
    [[nodiscard]] virtual pod2 compute_compression_backbone(double) const = 0;
    [[nodiscard]] virtual pod2 compute_tension_backbone(double) const = 0;
    [[nodiscard]] virtual double compute_compression_residual(double, double) const = 0;
    [[nodiscard]] virtual double compute_tension_residual(double, double) const = 0;
    [[nodiscard]] pod2 compute_compression_inner(double) const;
    [[nodiscard]] pod2 compute_tension_inner(double) const;
 
public:
    SimpleHysteresis(
        unsigned,   // tag
        double,     // middle point
        double = 0. // density
    );
 
    int update_trial_status(const vec&) override;
 
    int clear_status() override;
    int commit_status() override;
    int reset_status() override;
};
 
#endif