BilinearJ2.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 BILINEARJ2_H
#define BILINEARJ2_H
 
#include <Material/Material3D/Material3D.h>
 
struct DataBilinearJ2 {
    const double elastic_modulus; // elastic modulus
    const double poissons_ratio;  // poisson's ratio
    const double yield_stress;    // initial yield stress
    const double hardening_ratio; // hardening ratio
    const double beta;            // isotropic (1.0) / kinematic (0.0) hardening factor
};
 
class BilinearJ2 final : protected DataBilinearJ2, public Material3D {
    static const double two_third;
    static const double root_two_third;
    static const mat unit_dev_tensor;
 
    const double shear_modulus = elastic_modulus / (2. + 2. * poissons_ratio); // shear modulus
    const double double_shear = 2. * shear_modulus;                            // double shear modulus
    const double square_double_shear = double_shear * double_shear;            // double shear modulus squared
    const double isotropic_modulus = beta * elastic_modulus * hardening_ratio / (1. - hardening_ratio);
    const double kinematic_modulus = (1. - beta) * elastic_modulus * hardening_ratio / (1. - hardening_ratio);
 
public:
    BilinearJ2(
        unsigned,    // tag
        double,      // elastic modulus
        double,      // poisson's ratio
        double,      // initial yield stress
        double = 0., // hardening ratio
        double = 1., // isotropic (1.0) / kinematic (0.0) hardening factor
        double = 0.  // density
    );
 
    int initialize(const shared_ptr<DomainBase>&) override;
 
    unique_ptr<Material> get_copy() override;
 
    [[nodiscard]] double get_parameter(ParameterType) const override;
 
    int update_trial_status(const vec&) override;
 
    int clear_status() override;
    int commit_status() override;
    int reset_status() override;
 
    void print() override;
};
 
#endif