finiteelements/mechanics/materials/hyperelastic/volumetric/interface.hh

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// SPDX-FileCopyrightText: 2021-2025 The Ikarus Developers mueller@ibb.uni-stuttgart.de
// SPDX-License-Identifier: LGPL-3.0-or-later
 
#pragma once
 
#include <ikarus/finiteelements/mechanics/materials/hyperelastic/concepts.hh>
#include <ikarus/finiteelements/physicshelper.hh>
#include <ikarus/utils/tensorutils.hh>
 
namespace Ikarus::Materials {
 
template <Concepts::VolumetricFunction VF>
struct Volumetric
{
  using VolumetricFunction = VF;
  using MaterialParameter  = double;
 
  [[nodiscard]] constexpr static std::string name() noexcept { return "Volumetric function: " + VF::name(); }
 
  template <typename VFF>
  Volumetric(MaterialParameter matPar, VFF&& vf)
      : matPar_{matPar},
        volumetricFunction_{std::forward<VFF>(vf)} {}
 
  const MaterialParameter materialParameter() const { return matPar_; }
 
  template <typename ST>
  ST storedEnergy(const ST& J) const {
    return matPar_ * volumetricFunction_.storedEnergyImpl(J);
  };
 
  template <typename ST>
  ST firstDerivative(const ST& J) const {
    return matPar_ * volumetricFunction_.firstDerivativeImpl(J);
  }
 
  template <typename ST>
  ST secondDerivative(const ST& J) const {
    return matPar_ * volumetricFunction_.secondDerivativeImpl(J);
  };
 
private:
  MaterialParameter matPar_;
  VF volumetricFunction_;
};
 
#ifndef DOXYGEN
template <typename VF>
Volumetric(double, VF&&) -> Volumetric<std::remove_cvref_t<VF>>;
#endif
 
} // namespace Ikarus::Materials