text: /*This file is part of the FEBio source code and is licensed under the MIT license
  listed below.
  
  See Copyright-FEBio.txt for details.
  
  Copyright (c) 2019 University of Utah, The Trustees of Columbia University in 
  the City of New York, and others.
  
  Permission is hereby granted, free of charge, to any person obtaining a copy
  of this software and associated documentation files (the "Software"), to deal
  in the Software without restriction, including without limitation the rights
  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  copies of the Software, and to permit persons to whom the Software is
  furnished to do so, subject to the following conditions:
  
  The above copyright notice and this permission notice shall be included in all
  copies or substantial portions of the Software.
  
  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  SOFTWARE.*/
  
  
  #pragma once
  #include "FEElasticMaterial.h"
  
  
  class FEPRLig : public FEElasticMaterial
  {
  public:
  	FEPRLig(FEModel* pfem);
  
  public:
  	
  	double	m_c1;	 //!< fiber constant c1
  	double	m_c2;	 //!< fiber constant c2 
  	double  m_u;     //!< Lame Coefficient mu of the matrix
  	double	m_m;	 //!< Poisson's ratio slope 
  	double	m_v0;	 //!< initial Poisson's ratio
  	double	m_k;	 //!< Penalty for the volumetric strain energy
  
  
  public:
  	//! calculate stress at material point
  	virtual mat3ds Stress(FEMaterialPoint& pt) override;
  
  	//! calculate tangent stiffness at material point
  	virtual tens4ds Tangent(FEMaterialPoint& pt) override;
  
  	// declare the parameter list
  	DECLARE_PARAMETER_LIST();
  };
  