SR2Invariant.h

// Copyright 2024, 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/models/Model.h"
#include <cstdint>
 
namespace neml2
{
class Scalar;
class SR2;
 
class SR2Invariant : public Model
{
public:
  enum class IType : std::uint8_t
  {
    I1,
    I2,
    VONMISES,
    EFFECTIVE_STRAIN,
    INVALID
  };
 
  static OptionSet expected_options();
 
  SR2Invariant(const OptionSet & options);
 
protected:
  void set_value(bool out, bool dout_din, bool d2out_din2) override;
 
  const IType _type;
 
  const Variable<SR2> & _A;
 
  Variable<Scalar> & _invariant;
};
} // namespace neml2