NonlinearCDP.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 NONLINEARCDP_H
#define NONLINEARCDP_H
 
#include <Material/Material3D/Material3D.h>
 
struct DataNonlinearCDP {
    const double elastic_modulus, poissons_ratio;
    const double g_t, g_c;
    const double alpha, alpha_p, s0;
};
 
class NonlinearCDP : protected DataNonlinearCDP, public Material3D {
    static constexpr unsigned max_iteration = 20u;
    static const double root_three_two;
    static constexpr double scale = .999; // to avoid overshoot
    static const mat unit_dev_tensor;
 
    const double bulk = elastic_modulus / (3. - 6. * poissons_ratio);
    const double double_shear = elastic_modulus / (1. + poissons_ratio);
    const double three_alpha_p_bulk = 3. * alpha_p * bulk;
    const double pfplambda = -3. * alpha * three_alpha_p_bulk - root_three_two * double_shear;
    const double one_minus_alpha = 1. - alpha;
 
    const vec unit_alpha_p{alpha_p, alpha_p, alpha_p, 0., 0., 0.};
 
    static double compute_r(const vec&);
    static vec compute_dr(const vec&);
 
    [[nodiscard]] inline double compute_s(double) const;
 
    [[nodiscard]] virtual podarray<double> compute_tension_backbone(double) const = 0;
 
    [[nodiscard]] virtual podarray<double> compute_compression_backbone(double) const = 0;
 
public:
    NonlinearCDP(
        unsigned, // tag
        double,   // elastic modulus
        double,   // poissons ratio
        double,   // normalized crack energy (+)
        double,   // normalized crush energy (+)
        double,   // dilatancy parameter
        double,   // biaxial compression strength ratio
        double,   // stiffness recovery
        double    // density
    );
 
    int initialize(const shared_ptr<DomainBase>&) 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;
 
    vector<vec> record(OutputType) override;
 
    void print() override;
};
 
#endif