Elastic1DLinear.hpp

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//==============================================================================
//
//                       Seismo Virtual Laboratory
//             Module for Serial and Parallel Analysis of seismic 
//         wave propagation and soil-structure interaction simulation
//         Copyright (C) 2018-2021, The California Institute of Technology
//                         All Rights Reserved.
//
// Commercial use of this program without express permission of the California
// Institute of Technology, is strictly  prohibited. See  file "COPYRIGHT"  in
// main  directory  for  information on  usage  and  redistribution, and for a
// DISCLAIMER OF ALL WARRANTIES.
//
//==============================================================================
//
// Written by:
//   Danilo S. Kusanovic (dkusanov@caltech.edu)
//   Elnaz E. Seylabi    (elnaze@unr.edu)
//
// Supervised by:
//   Domniki M. Asimaki  (domniki@caltech.edu)
//
// References : 
//  [1] Finite Element Procedures, Bathe, K.J., Chapter 4: pages 194, Table 4.3,  
//      Prentice-Hall, 1996. 
//
// Description:
//------------------------------------------------------------------------------

#ifndef _ELASTIC1DLINEAR_HPP_
#define _ELASTIC1DLINEAR_HPP_

#include <string>
#include <memory>
#include <Eigen/Dense>

#include "Material.hpp"

class Elastic1DLinear : public Material{

    public:
        Elastic1DLinear(const double E, const double nu = 0, const double rho = 0.0);

        ~Elastic1DLinear();

        //Clone the 'Elastic1DLinear' material.
        std::unique_ptr<Material> CopyMaterial();

        double GetDensity() const;

        double GetPoissonRatio() const;

        double GetBulkModulus() const;

        double GetShearModulus() const;

        double GetElasticityModulus() const;

        double GetEnergy() const;

        Eigen::MatrixXd GetDamping() const;

        Eigen::VectorXd GetStrain() const;

        Eigen::VectorXd GetStress() const;

        Eigen::VectorXd GetStrainRate() const;

        Eigen::VectorXd GetTotalStress() const;

        Eigen::MatrixXd GetTangentStiffness() const;

        Eigen::MatrixXd GetInitialTangentStiffness() const;

        void CommitState();

        void ReverseState();

        void InitialState();

        void UpdateState(const Eigen::VectorXd strain, const unsigned int cond);

    private:
        double E;

        double nu;

        double Rho;

        Eigen::VectorXd Strain;

        Eigen::VectorXd newStrain;

        Eigen::MatrixXd TangentStiffness;
};

#endif