MooneyRivlinIsotropicMaterial::MooneyRivlinIsotropicMaterial(TetMesh * tetMesh, int enableCompressionResistance_, double compressionResistance_) : IsotropicMaterialWithCompressionResistance(enableCompressionResistance_), compressionResistance(compressionResistance_)
{
int numElements = tetMesh->getNumElements();
mu01_ = (double*) malloc (sizeof(double) * numElements);
mu10_ = (double*) malloc (sizeof(double) * numElements);
v1_ = (double*) malloc (sizeof(double) * numElements);
if (enableCompressionResistance)
EdivNuFactor = (double*) malloc (sizeof(double) * numElements);
else
EdivNuFactor = NULL;
for(int el=0; el<numElements; el++)
{
VolumetricMesh::Material * material = tetMesh->getElementMaterial(el);
VolumetricMesh::MooneyRivlinMaterial * mooneyRivlinMaterial = downcastMooneyRivlinMaterial(material);
if (mooneyRivlinMaterial == NULL)
{
printf("Error: MooneyRivlinIsotropicMaterial: mesh does not consist of Mooney-Rivlin materials.\n");
throw 1;
}
mu01_[el] = mooneyRivlinMaterial->getmu01();
mu10_[el] = mooneyRivlinMaterial->getmu10();
v1_[el] = mooneyRivlinMaterial->getv1();
if (enableCompressionResistance)
{
// invert the following formulas to compute "pseudo" E and nu that correspond to this material
//K = Ea / ( 3 * ( 1 - 2 * nua ) );
//G = Ea / ( 2 * ( 1 + nua ) );
//mu10 = G / ( 2 * ( 1 + mur ) );
//mu01 = mur * mu10;
//v1 = K / 2;
double K = 2.0 * v1_[el];
double muRatio = mu01_[el] / mu10_[el];
double G = mu10_[el] * ( 2 * ( 1 + muRatio ) );
double E = 9 * K * G / (3 * K + G);
double nu = (3 * K - 2 * G) / (2 * (3 * K + G));
EdivNuFactor[el] = compressionResistance * E / (1.0 - 2.0 * nu);
//printf("Setting EdivNuFactor[%d]=%G\n", el, EdivNuFactor[el]);
}
}
}
MooneyRivlinIsotropicMaterial::MooneyRivlinIsotropicMaterial(TetMesh * tetMesh)
{
int numElements = tetMesh->getNumElements();
mu01_ = (double*) malloc (sizeof(double) * numElements);
mu10_ = (double*) malloc (sizeof(double) * numElements);
v1_ = (double*) malloc (sizeof(double) * numElements);
for(int el=0; el<numElements; el++)
{
VolumetricMesh::Material * material = tetMesh->getElementMaterial(el);
VolumetricMesh::MooneyRivlinMaterial * mooneyRivlinMaterial = downcastMooneyRivlinMaterial(material);
if (mooneyRivlinMaterial == NULL)
{
printf("Error: mesh does not consist of Mooney-Rivlin materials.\n");
throw 1;
}
mu01_[el] = mooneyRivlinMaterial->getmu01();
mu10_[el] = mooneyRivlinMaterial->getmu10();
v1_[el] = mooneyRivlinMaterial->getv1();
}
}