BilinearPO.h

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/*******************************************************************************
 * Copyright (C) 2017-2023 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 BILINEARPO_H
#define BILINEARPO_H
 
#include "PeakOriented.h"
 
struct DataBilinearPO {
    const double elastic_modulus;
 
    const double t_strain;
    const double t_hardening;
    const double c_strain;
    const double c_hardening;
};
 
class BilinearPO final : DataBilinearPO, public PeakOriented {
    const double t_stress = elastic_modulus * t_strain;
    const double c_stress = elastic_modulus * c_strain;
 
    [[nodiscard]] podarray<double> compute_compression_initial_reverse() const override;
    [[nodiscard]] podarray<double> compute_tension_initial_reverse() const override;
    [[nodiscard]] podarray<double> compute_tension_backbone(double) const override;
    [[nodiscard]] podarray<double> compute_compression_backbone(double) const override;
 
public:
    BilinearPO(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