NLE3D01.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 NLE3D01_H
#define NLE3D01_H
 
#include "IsotropicNonlinearElastic3D.h"
 
struct DataNLE3D01 {
    const double bulk; // 9K
    const double ref_strain;
    const double ref_stress;
    const double m;
};
 
class NLE3D01 final : protected DataNLE3D01, public IsotropicNonlinearElastic3D {
    const double factor_a = (.5 * m + .5) * ref_stress / (1. + m) * pow(ref_strain, -m);
    const double factor_b = (.5 * m - .5) * factor_a;
 
    vec compute_derivative(double, double) override;
 
public:
    NLE3D01(
        unsigned, // tag
        double,   // bulk modulus
        double,   // reference strain
        double,   // reference stress
        double,   // m
        double    // density
    );
 
    unique_ptr<Material> get_copy() override;
};
 
#endif