FECellGrowth.cpp

/*This file is part of the FEBio source code and is licensed under the MIT license
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See Copyright-FEBio.txt for details.

Copyright (c) 2021 University of Utah, The Trustees of Columbia University in
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#include "stdafx.h"
#include "FECellGrowth.h"
#include <FECore/log.h>

//-----------------------------------------------------------------------------
// define the material parameters
BEGIN_FECORE_CLASS(FECellGrowth, FEElasticMaterial)
	ADD_PARAMETER(m_phir, FE_RANGE_GREATER(0.0), "phir");
	ADD_PARAMETER(m_cr  , FE_RANGE_GREATER(0.0), "cr")->setUnits(UNIT_CONCENTRATION);
	ADD_PARAMETER(m_ce  , FE_RANGE_GREATER(0.0), "ce")->setUnits(UNIT_CONCENTRATION);
END_FECORE_CLASS();

//-----------------------------------------------------------------------------
FECellGrowth::FECellGrowth(FEModel* pfem) : FEElasticMaterial(pfem) 
{ 
	m_Rgas = 0; 
	m_Tabs = 0; 

	m_phir = 0;
	m_cr = 0;
	m_ce = 0;
}

//-----------------------------------------------------------------------------
bool FECellGrowth::Init()
{
	if (FEElasticMaterial::Init() == false) return false;

	m_Rgas = GetGlobalConstant("R");
	m_Tabs = GetGlobalConstant("T");
	
	if (m_Rgas <= 0) { feLogError("A positive universal gas constant R must be defined in Globals section"); return false; }
	if (m_Tabs <= 0) { feLogError("A positive absolute temperature T must be defined in Globals section");	 return false; }

	return true;
}

//-----------------------------------------------------------------------------
mat3ds FECellGrowth::Stress(FEMaterialPoint& mp)
{
	FEElasticMaterialPoint& pt = *mp.ExtractData<FEElasticMaterialPoint>();
	
	// jacobian
	double J = pt.m_J;
	
	// calculate intracellular osmolarity relative to mixture volume in reference configuration
	double c = m_cr/(J-m_phir);
	
	// calculate osmotic pressure
	double p = m_Rgas*m_Tabs*(c - m_ce);
	
	// calculate T = -p*I
	mat3dd I(1.0);	// identity tensor
	mat3ds s = -p*I;
	return s;
}

//-----------------------------------------------------------------------------
tens4ds FECellGrowth::Tangent(FEMaterialPoint& mp)
{
	FEElasticMaterialPoint& pt = *mp.ExtractData<FEElasticMaterialPoint>();
	
	// jacobian
	double J = pt.m_J;
	
	// calculate intracellular osmolarity relative to mixture volume in reference configuration
	double c = m_cr/(J-m_phir);
		
	// calculate osmotic pressure
	double p = m_Rgas*m_Tabs*(c - m_ce);
	
	mat3dd I(1.0);	// Identity
	
	tens4ds I1 = dyad1s(I);
	tens4ds I4  = dyad4s(I);
	
	// calculate tangent osmotic modulus
	tens4ds C = I4*(2*p) - I1*(p-m_Rgas*m_Tabs*c*J/(J-m_phir));
	return C;
}