SSR4.h

// Copyright 2023, UChicago Argonne, LLC
// All Rights Reserved
// Software Name: NEML2 -- the New Engineering material Model Library, version 2
// By: Argonne National Laboratory
// OPEN SOURCE LICENSE (MIT)
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#pragma once
 
#include "neml2/tensors/FixedDimTensor.h"
 
namespace neml2
{
class Scalar;
class SR2;
class R4;
class SSFR5;
class Rot;
 
class SSR4 : public FixedDimTensor<SSR4, 6, 6>
{
public:
  using FixedDimTensor<SSR4, 6, 6>::FixedDimTensor;
 
  SSR4(const R4 & T);
 
  static SSR4 identity(const torch::TensorOptions & options = default_tensor_options());
  static SSR4 identity_sym(const torch::TensorOptions & options = default_tensor_options());
  static SSR4 identity_vol(const torch::TensorOptions & options = default_tensor_options());
  static SSR4 identity_dev(const torch::TensorOptions & options = default_tensor_options());
  static SSR4 isotropic_E_nu(const Scalar & E, const Scalar & nu);
  static SSR4 isotropic_E_nu(const Real & E,
                             const Real & nu,
                             const torch::TensorOptions & options = default_tensor_options());
 
  SSR4 rotate(const Rot & r) const;
 
  SSFR5 drotate(const Rot & r) const;
 
  Scalar operator()(TorchSize i, TorchSize j, TorchSize k, TorchSize l) const;
 
  // Inversion
  SSR4 inverse() const;
 
  SSR4 transpose_minor() const;
 
  SSR4 transpose_major() const;
};
 
SR2 operator*(const SSR4 & a, const SR2 & b);
SR2 operator*(const SR2 & a, const SSR4 & b);
SSR4 operator*(const SSR4 & a, const SSR4 & b);
} // namespace neml2