Yeoh.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 YEOH_H
#define YEOH_H
 
#include <Material/Material3D/Material3D.h>
 
struct DataYeoh {
    const vec A0;
    const vec A1;
};
 
class Yeoh final : DataYeoh, public Material3D {
    static const vec weight;
    static const vec I1E;
 
    static constexpr double one_three = 1. / 3.;
    static constexpr double two_three = 2. * one_three;
    static constexpr double four_three = 2. * two_three;
    static constexpr double five_three = 5. * one_three;
    static constexpr double eight_nine = two_three * four_three;
 
    [[nodiscard]] vec compute_derivative(double, double) const;
 
public:
    Yeoh(unsigned,   // tag
         vec&&,      // constants
         vec&&,      // constants
         double = 0. // density
    );
 
    int initialize(const shared_ptr<DomainBase>&) override;
 
    unique_ptr<Material> get_copy() override;
 
    int update_trial_status(const vec&) override;
 
    int clear_status() override;
    int commit_status() override;
    int reset_status() override;
 
    void print() override;
};
 
#endif