cl_Material_YBCO.hpp

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/*
 * BELFEM -- The Berkeley Lab Finite Element Framework
 * Copyright (c) 2026, The Regents of the University of California,
 * through Lawrence Berkeley National Laboratory (subject to receipt of any required
 * approvals from the U.S. Dept. of Energy).  All rights reserved.
 *
 * Developers: Christian Messe, Gregory Giard
 *
 * See the top-level LICENSE file for the complete license and disclaimer.
 */
 
#ifndef BELFEM_CL_MATERIAL_YBCO_HPP
#define BELFEM_CL_MATERIAL_YBCO_HPP
 
#include "cl_Material_Metal.hpp"
#include "cl_Bezier.hpp"
 
namespace belfem
{
    namespace material
    {
//------------------------------------------------------------------------------

        class YBCO : public Metal
        {
            // Reference values for scaling normalized curves
            Vector< real > mReferenceValues ;
            Vector< real > mCallawayModel ;
 
            // Young's modulus (Bezier for low T, polynomial for high T)
            Bezier * mYoungBezier = nullptr ;
            Vector< real > mYoungPoly ;
 
            // Poisson's ratio (piecewise polynomials)
            Cell< Vector< real > > mPoissionPolys ;
 
            // Thermal expansion (polynomial with constant tail)
            real mTAlphaPlateau ;
            Vector< real > mAlphaPoly ;
            Vector< real > mThermalExpansionCryo ;
 
            // Specific heat (4 piecewise regions in log-log space)
            Vector< real > mTCpSwitch ;
            Cell< Vector< real > > mCpPolys ;
 
        public:

            YBCO();

            ~YBCO() override;

            real
            test_callaway( const real T , const Vector< real > & aParams );
 
        protected:

            real
            E_custom( const real T ) const override ;

            real
            nu_custom( const real T ) const override ;

            real
            alpha_custom(const real T) const override ;

            real
            cp_custom(const real T) const override ;

            real
            lambda_custom(const real T) const override;
 
        private:

            void
            set_young( const real aEref, const real aTref );

            void
            set_poisson( const real aNuref, const real aTref );

            void
            create_mech();

            void
            create_expansion();
 
            void
            create_expansion_cryo();

            void
            create_cp();
        };
 
    }
}
 
#endif //BELFEM_CL_MATERIAL_YBCO_HPP