Dhakal.h

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/*******************************************************************************
 * Copyright (C) 2017-2026 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 DHAKAL_H
#define DHAKAL_H
 
#include "Degradation.h"
 
struct DataDhakal {
    const double yield_strain, inter_strain, inter_factor;
    const double slope = (inter_factor - 1.) / (inter_strain - yield_strain);
    const double final_strain = (inter_factor - .2) * 50. * yield_strain + inter_strain;
};
 
class Dhakal final : protected DataDhakal, public StrainDegradation {
    [[nodiscard]] vec compute_positive_degradation(double) const override;
    [[nodiscard]] vec compute_negative_degradation(double) const override;
 
public:
    Dhakal(
        unsigned, // unique tag
        unsigned, // material tag
        double,   // yield strain
        double    // parameter
    );
 
    unique_ptr<Material> unique_copy() override;
};
 
#endif