// Set nodal equivalent of distributed face load to evec.
// surLd - object describing element face load;
// returns loaded element face
// or -1 (loaded nodes do not match elem face)
public override int equivFaceLoad(ElemFaceLoad surLd)
{
// Shape functons
double[] an = new double[2];
// Derivatives of shape functions
double[] xin = new double[2];
for (int i = 0; i < 8; i++)
{
evec[i] = 0.0;
}
int loadedFace = surLd.rearrange(faceInd, ind);
if (loadedFace == -1)
{
return(-1);
}
// Gauss integration loop
for (int ip = 0; ip < gf.nIntPoints; ip++)
{
ShapeLin2D.shapeDerivFace(gf.xii[ip], an, xin);
double p = r = 0.0;
double xs = 0.0;
double ys = 0.0;
for (int i = 0; i < 2; i++)
{
p += an[i] * surLd.forceAtNodes[i];
int j = faceInd[loadedFace][i];
r += an[i] * xy[j][0];
xs += xin[i] * xy[j][0];
ys += xin[i] * xy[j][1];
}
double dl = Math.Sqrt(xs * xs + ys * ys);
double ds = dl;
if (FeModel.stressState == FeModel.StrStates.axisym)
{
ds *= 2.0 * Math.PI * r;
}
double p1, p2;
// direction=0 - normal load, =1,2 - along axes x,y
if (surLd.direction == 0 && ds > 0.0)
{
p1 = p * ys / dl;
p2 = -p * xs / dl;
}
else if (surLd.direction == 1)
{
p1 = p; p2 = 0;
}
else
{
p1 = 0; p2 = p;
}
for (int i = 0; i < 2; i++)
{
int j = faceInd[loadedFace][i];
evec[2 * j] += an[i] * p1 * ds * gf.wi[ip] * this.t;
evec[2 * j + 1] += an[i] * p2 * ds * gf.wi[ip] * this.t;
// Console.WriteLine(2*j);
}
}
return(loadedFace);
}