CDP.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 CDP_H
#define CDP_H
 
#include "NonlinearCDP.h"
 
class CDP final : public NonlinearCDP {
    const double a_t, cb_t, f_t;
    const double a_c, cb_c, f_c;
 
    [[nodiscard]] podarray<double> compute_tension_backbone(double) const override;
    [[nodiscard]] podarray<double> compute_compression_backbone(double) const override;
 
public:
    explicit CDP(
        unsigned = 0,     // tag
        double = 3E4,     // elastic modulus
        double = .2,      // poissons ratio
        double = 3.,      // crack stress (+)
        double = 30.,     // crush stress (-)
        double = 1E-3,    // normalized crack energy (+)
        double = 1E-1,    // normalized crush energy (+)
        double = .8,      // hardening after crack stress a_t
        double = 4.,      // hardening after crush stress a_c
        double = .6,      // reference damage factor at half crack stress
        double = .6,      // reference damage factor at crush stress
        double = .2,      // dilatancy parameter
        double = 1.16,    // biaxial compression strength ratio
        double = .5,      // stiffness recovery
        double = 2400E-12 // density
    );
 
    unique_ptr<Material> get_copy() override;
};
class CDP final : public NonlinearCDP {…};
 
#endif