BilinearOO.h

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/*******************************************************************************
 * Copyright (C) 2017-2024 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 BILINEAROO_H
#define BILINEAROO_H
 
#include <Material/Material1D/Hysteresis/OriginOriented.h>
 
struct DataBilinearOO {
    const double elastic_modulus;
 
    const double t_strain;
    const double t_hardening;
    const double c_strain;
    const double c_hardening;
};
 
class BilinearOO final : protected DataBilinearOO, public OriginOriented {
    const double t_stress = elastic_modulus * t_strain;
    const double c_stress = elastic_modulus * c_strain;
 
    [[nodiscard]] podarray<double> compute_tension_backbone(double) const override;
    [[nodiscard]] podarray<double> compute_compression_backbone(double) const override;
 
public:
    BilinearOO(
        int,    // tag
        double, // elastic modulus
        double, // tension yield strain
        double, // tension hardening ratio
        double, // compression yield strain
        double, // compression hardening ratio
        double  // density
    );
 
    int initialize(const shared_ptr<DomainBase>&) override;
 
    unique_ptr<Material> get_copy() override;
 
    void print() override;
};
 
#endif