Chaste Commit::baa90ac2819b962188b7562f2326be23c47859a7
PoleZeroMaterialLaw.cpp
1/*
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34*/
35
36#include "PoleZeroMaterialLaw.hpp"
37
38template<unsigned DIM>
42
43template<unsigned DIM>
44void PoleZeroMaterialLaw<DIM>::SetParameters(std::vector<std::vector<double> > k,
45 std::vector<std::vector<double> > a,
46 std::vector<std::vector<double> > b)
47{
48 if (DIM!=2 && DIM !=3)
49 {
50 EXCEPTION("Can only have a 2 or 3d incompressible pole-zero law");
51 }
52
53 assert(k.size() == DIM);
54 assert(a.size() == DIM);
55 assert(b.size() == DIM);
56
57 for (unsigned i = 0; i < DIM; i++)
58 {
59 assert(k[i].size() == DIM);
60 assert(a[i].size() == DIM);
61 assert(b[i].size() == DIM);
62
63 for (unsigned j = 0; j < DIM; j++)
64 {
65 assert(k[i][j] == k[j][i]);
66 assert(a[i][j] == a[j][i]);
67 assert(b[i][j] == b[j][i]);
68 }
69 }
70
71 mK = k;
72 mA = a;
73 mB = b;
74
75 for (unsigned M=0; M<DIM; M++)
76 {
77 for (unsigned N=0; N<DIM; N++)
78 {
79 mIdentity(M,N) = M==N ? 1.0 : 0.0;
80 }
81 }
82}
83
84template<unsigned DIM>
85PoleZeroMaterialLaw<DIM>::PoleZeroMaterialLaw(std::vector<std::vector<double> > k,
86 std::vector<std::vector<double> > a,
87 std::vector<std::vector<double> > b)
88{
89 SetParameters(k,a,b);
90}
91
92template<unsigned DIM>
94 c_matrix<double,DIM,DIM>& rInvC,
95 double pressure,
96 c_matrix<double,DIM,DIM>& rT,
98 bool computeDTdE)
99{
100 static c_matrix<double,DIM,DIM> C_transformed;
101 static c_matrix<double,DIM,DIM> invC_transformed;
102
103 // The material law parameters are set up assuming the fibre direction is (1,0,0)
104 // and sheet direction is (0,1,0), so we have to transform C,inv(C),and T.
105 // Let P be the change-of-basis matrix P = (\mathbf{m}_f, \mathbf{m}_s, \mathbf{m}_n).
106 // The transformed C for the fibre/sheet basis is C* = P^T C P.
107 // We then compute T* = T*(C*), and then compute T = P T* P^T.
108
109 this->ComputeTransformedDeformationTensor(rC, rInvC, C_transformed, invC_transformed);
110
111 // compute T*
112
113 c_matrix<double,DIM,DIM> E = 0.5*(C_transformed - mIdentity);
114
115 for (unsigned M=0; M<DIM; M++)
116 {
117 for (unsigned N=0; N<DIM; N++)
118 {
119 double e = E(M,N);
120 {
121 double b = mB[M][N];
122 double a = mA[M][N];
123 double k = mK[M][N];
124
125 //if this fails one of the strain values got too large for the law
126 if (e>=a)
127 {
128 EXCEPTION("E_{MN} >= a_{MN} - strain unacceptably large for model");
129 }
130
131 rT(M,N) = k
132 * e
133 * (2*(a-e) + b*e)
134 * pow(a-e,-b-1)
135 - pressure*invC_transformed(M,N);
136 }
137 }
138 }
139
140 if (computeDTdE)
141 {
142 for (unsigned M=0; M<DIM; M++)
143 {
144 for (unsigned N=0; N<DIM; N++)
145 {
146 for (unsigned P=0; P<DIM; P++)
147 {
148 for (unsigned Q=0; Q<DIM; Q++)
149 {
150 rDTdE(M,N,P,Q) = 2 * pressure * invC_transformed(M,P) * invC_transformed(Q,N);
151 }
152 }
153
154 double e = E(M,N);
155
156 double b = mB[M][N];
157 double a = mA[M][N];
158 double k = mK[M][N];
159
160 rDTdE(M,N,M,N) += k
161 * pow(a-e, -b-2)
162 * (
163 2*(a-e)*(a-e)
164 + 4*b*e*(a-e)
165 + b*(b+1)*e*e
166 );
167 }
168 }
169 }
170
171 // Now do: T = P T* P^T and dTdE_{MNPQ} = P_{Mm}P_{Nn}P_{Pp}P_{Qq} dT*dE*_{mnpq}
172 this->TransformStressAndStressDerivative(rT, rDTdE, computeDTdE);
173}
174
175template<unsigned DIM>
177{
178 return 0.0;
179}
180
181template<unsigned DIM>
183{
184 assert(scaleFactor > 0.0);
185 for (unsigned i=0; i<mK.size(); i++)
186 {
187 for (unsigned j=0; j<mK[i].size(); j++)
188 {
189 mK[i][j] /= scaleFactor;
190 }
191 }
192}
193
194// Explicit instantiation
195template class PoleZeroMaterialLaw<2>;
196template class PoleZeroMaterialLaw<3>;
#define EXCEPTION(message)
void ScaleMaterialParameters(double scaleFactor)
void SetParameters(std::vector< std::vector< double > > k, std::vector< std::vector< double > > a, std::vector< std::vector< double > > b)
void ComputeStressAndStressDerivative(c_matrix< double, DIM, DIM > &rC, c_matrix< double, DIM, DIM > &rInvC, double pressure, c_matrix< double, DIM, DIM > &rT, FourthOrderTensor< DIM, DIM, DIM, DIM > &rDTdE, bool computeDTdE)