SSR4.h

// Copyright 2024, UChicago Argonne, LLC
// All Rights Reserved
// Software Name: NEML2 -- the New Engineering material Model Library, version 2
// By: Argonne National Laboratory
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#pragma once
 
#include "neml2/tensors/PrimitiveTensor.h"
#include "neml2/tensors/DTensor.h"
 
namespace neml2
{
class Scalar;
class SR2;
class R4;
class Rot;

class SSR4 : public PrimitiveTensor<SSR4, 6, 6>
{
public:
  using PrimitiveTensor<SSR4, 6, 6>::PrimitiveTensor;

  SSR4(const R4 & T);

  [[nodiscard]] static SSR4 identity(const TensorOptions & options = default_tensor_options());
  static SSR4 identity_sym(const TensorOptions & options = default_tensor_options());
  static SSR4 identity_vol(const TensorOptions & options = default_tensor_options());
  static SSR4 identity_dev(const TensorOptions & options = default_tensor_options());

  static SSR4 identity_C1(const TensorOptions & options = default_tensor_options());
  static SSR4 identity_C2(const TensorOptions & options = default_tensor_options());
  static SSR4 identity_C3(const TensorOptions & options = default_tensor_options());

  static SSR4 isotropic_E_nu(const Scalar & E, const Scalar & nu);
  static SSR4 isotropic_E_nu(const double & E,
                             const double & nu,
                             const TensorOptions & options = default_tensor_options());

  static SSR4 fill_C1_C2_C3(const Scalar & C1, const Scalar & C2, const Scalar & C3);
  static SSR4 fill_C1_C2_C3(const double & C1,
                            const double & C2,
                            const double & C3,
                            const TensorOptions & options = default_tensor_options());

  SSR4 rotate(const Rot & r) const;

  DTensor<SSR4, Rot, neml2::Tensor> drotate(const Rot & r) const;

  DTensor<SSR4, SSR4, neml2::Tensor> drotate_self(const Rot & r) const;

  Scalar operator()(Size i, Size j, Size k, Size l) const;

  SSR4 transpose_minor() const;

  SSR4 transpose_major() const;
};
 
SSR4 operator*(const SSR4 & a, const SSR4 & b);
SR2 operator*(const SSR4 & a, const SR2 & b);
} // namespace neml2