BilinearDP.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 BILINEARDP_H
#define BILINEARDP_H
 
#include "NonlinearDruckerPrager.h"
 
struct DataBilinearDP {
    const double cohesion, cohesion_slope;
    const double critical = -cohesion / cohesion_slope;
};
 
class BilinearDP final : protected DataBilinearDP, public NonlinearDruckerPrager {
    [[nodiscard]] double compute_c(double) const override;
    [[nodiscard]] double compute_dc(double) const override;
 
public:
    BilinearDP(
        unsigned,   // tag
        double,     // elastic modulus
        double,     // poisson's ratio
        double,     // eta_yield (hydrostatic stress related)
        double,     // eta_flow (dilatancy angle related)
        double,     // xi (cohesion related)
        double,     // cohesion
        double,     // cohesion slope
        double = 0. // density
    );
 
    unique_ptr<Material> get_copy() override;
 
    void print() override;
};
 
#endif