// ....Compute element Matrix.....................................
public override double[,] ComputeMatrix()
{
double[] gaussCoord = { -1 / Math.Sqrt(3), 1 / Math.Sqrt(3) };
if (Modell.Material.TryGetValue(ElementMaterialId, out var abstractMaterial))
{
}
material = (Material)abstractMaterial;
ElementMaterial = material ?? throw new ArgumentNullException(nameof(material));
var conductivity = material.Leitfähigkeit[0];
MatrizenAlgebra.Clear(elementMatrix);
foreach (var coor1 in gaussCoord)
{
foreach (var coor2 in gaussCoord)
{
var z0 = coor1;
var z1 = coor2;
ComputeGeometry(z0, z1);
Sx = ComputeSx(z0, z1);
// Ke = C*Sx*SxT*determinant
MatrizenAlgebra.MultAddMatrixTransposed(elementMatrix, Determinant * conductivity, Sx, Sx);
}
}
return(elementMatrix);
}
// ....Compute element matrix.....................................
public override double[,] ComputeMatrix()
{
if (Modell.Material.TryGetValue(ElementMaterialId, out var abstractMaterial))
{
}
Material = (Material)abstractMaterial;
double[] gCoord = { -1 / Math.Sqrt(5.0 / 3), 0, 1 / (Math.Sqrt(5.0 / 3)) };
double[] gWeight = { (5.0 / 9), (8.0 / 9), (5.0 / 9) }; // gaussian coordinates, weights
_ = new double[8, 3];
MatrizenAlgebra.Clear(elementMatrix);
// material matrix für ebene Verzerrung (plane strain)
var conduct = ((Material)Material)?.Leitfähigkeit;
if (conduct != null)
{
e[0, 0] = conduct[0];
e[1, 1] = conduct[1];
e[2, 2] = conduct[2];
}
for (var i = 0; i < gCoord.Length; i++)
{
var z0 = gCoord[i]; var g0 = gWeight[i];
for (var j = 0; j < gCoord.Length; j++)
{
var z1 = gCoord[j]; var g1 = gWeight[j];
for (var k = 0; k < gCoord.Length; k++)
{
var z2 = gCoord[k]; var g2 = gWeight[k];
ComputeGeometry(z0, z1, z2);
Sx = ComputeSx(z0, z1, z2);
// Ke = determinant*g0*g1*g2*Sx*E*SxT
var temp = MatrizenAlgebra.Mult(Sx, e);
MatrizenAlgebra.MultAddMatrixTransposed(elementMatrix, Determinant * g0 * g1 * g2, temp, Sx);
}
}
}
return(elementMatrix);
}
// ....Compute element matrix.....................................
public override double[,] ComputeMatrix()
{
MatrizenAlgebra.Clear(elementMatrix);
ComputeMaterial();
for (var i = 0; i < GCoord.Length; i++)
{
z0 = GCoord[i]; g0 = GWeight[i];
for (var j = 0; j < GCoord.Length; j++)
{
z1 = GCoord[j]; g1 = GWeight[j];
for (var k = 0; k < GCoord.Length; k++)
{
z2 = GCoord[k]; g2 = GWeight[k];
ComputeGeometry(z0, z1, z2);
Sx = ComputeSx(z0, z1, z2);
ComputeStrainDisplacementTransformation();
// Ke = determinant*g0*g1*g2*BT*E*B
var temp = MatrizenAlgebra.MultTransposedMatrix(Determinant * g0 * g1 * g2, b, e);
MatrizenAlgebra.MultAddMatrix(elementMatrix, temp, b);
}
}
}
return(elementMatrix);
}
