Bondslip Constraint Model idaholab#99

include/constraints/RebarBondSlipConstraint.h

@@ -0,0 +1,90 @@
+//* This file is part of the MOOSE framework
+//* https://www.mooseframework.org
+//*
+//* All rights reserved, see COPYRIGHT for full restrictions
+//* https://github.com/idaholab/moose/blob/master/COPYRIGHT
+//*
+//* Licensed under LGPL 2.1, please see LICENSE for details
+//* https://www.gnu.org/licenses/lgpl-2.1.html
+
+#pragma once
+
+// MOOSE includes
+#include "EqualValueEmbeddedConstraint.h"
+
+// Forward Declarations
+class RebarBondSlipConstraint;
+
+template <>
+InputParameters validParams<RebarBondSlipConstraint>();
+
+/// A RebarBondSlipConstraint enforces concrete-rebar constraint
+class RebarBondSlipConstraint : public EqualValueEmbeddedConstraint
+{
+public:
+  static InputParameters validParams();
+
+  RebarBondSlipConstraint(const InputParameters & parameters);
+  virtual void initialSetup() override;
+  virtual void timestepSetup() override;
+  bool shouldApply() override;
+  void reinitConstraint();
+
+protected:
+  virtual void computeTangent();
+  virtual Real computeQpResidual(Moose::ConstraintType type) override;
+  virtual Real computeQpJacobian(Moose::ConstraintJacobianType type) override;
+  virtual Real computeQpOffDiagJacobian(Moose::ConstraintJacobianType type,
+                                        unsigned int jvar) override;
+
+  /**
+   * Struct designed to hold info about the bonds slip history
+   */
+  struct bondSlipData
+  {
+    Real slip_min;
+    Real slip_max;
+    Real slip_min_old;
+    Real slip_max_old;
+    Real bondstress_min;
+    Real bondstress_max;
+    Real bondstress_min_old;
+    Real bondstress_max_old;
+
+    bondSlipData()
+      : slip_min(0.0),
+        slip_max(0.0),
+        slip_min_old(0.0),
+        slip_max_old(0.0),
+        bondstress_min(0.0),
+        bondstress_max(0.0),
+        bondstress_min_old(0.0),
+        bondstress_max_old(0.0)
+    {
+    }
+  };
+
+  // Bond-slip data
+  std::map<dof_id_type, bondSlipData> _bondslip;
+
+  const unsigned _component;
+  const unsigned int _mesh_dimension;
+  std::vector<unsigned int> _var_nums;
+  std::vector<MooseVariable *> _vars;
+
+  const bool _debug;
+
+  const Real _max_bondstress;
+  const Real _frictional_bondstress;
+  const Real _ultimate_slip;
+  const Real _bar_radius;
+  std::vector<Real> _transitional_slip;
+  /// constraint force needed to enforce the constraint
+  RealVectorValue _constraint_residual;
+  /// penalty force for the current constraint
+  RealVectorValue _pen_force;
+  RealVectorValue _slave_tangent;
+  Real _current_elem_volume;
+  bool _bond;
+  Real _bond_stress;
+};