Interference problem

[rpenidef]

Hi Louise,

I am trying to model a fabric with a 10/12 yarns/cm. So 1mm in one direction and ~ 0.83mm in the other. For now I do not really care about the shape of the sections so I am trying CTextileWeave2D to do it (it is supposed to be able to solve interference problems when you set refine to 1, am I right?).
The thing is that it does create interference on the SwapPositions parts (I tried setting GapSize but it does not work. The interference created is too big for the "solve interference & export to Abaqus" to work and the simulation gives an "Error of excessive overclosure" in the contacts. Any suggestion on how to solve this?

Here is the Script:

Code: Select all

from _Embedded import *
from TexGen.Core import *
from TexGen.Renderer import *
from TexGen.Export import *
from TexGen.WeavePattern import *
from TexGen.WiseTex import *
from TexGen.FlowTex import *
import math
weave = CTextileWeave2D(5, 5, 1, 0.5, 1,1)
weave.SetYarnWidths(1)
weave.SwapPosition(0, 0)
weave.SwapPosition(1, 3)
weave.SwapPosition(2, 1)
weave.SwapPosition(3, 4)
weave.SwapPosition(4, 2)
weave.SetXYarnWidths(0, 1)
weave.SetXYarnHeights(0, 0.2)
weave.SetXYarnSpacings(0, 1)
weave.SetXYarnWidths(1, 1)
weave.SetXYarnHeights(1, 0.2)
weave.SetXYarnSpacings(1, 1)
weave.SetXYarnWidths(2, 1)
weave.SetXYarnHeights(2, 0.2)
weave.SetXYarnSpacings(2, 1)
weave.SetXYarnWidths(3, 01)
weave.SetXYarnHeights(3, 0.2)
weave.SetXYarnSpacings(3, 1)
weave.SetXYarnWidths(4, 1)
weave.SetXYarnHeights(4, 0.2)
weave.SetXYarnSpacings(4, 1)
weave.SetYYarnWidths(0, 0.83)
weave.SetYYarnHeights(0, 0.21)
weave.SetYYarnSpacings(0, 0.83)
weave.SetYYarnWidths(1, 0.83)
weave.SetYYarnHeights(1, 0.21)
weave.SetYYarnSpacings(1, 0.83)
weave.SetYYarnWidths(2, 0.83)
weave.SetYYarnHeights(2, 0.21)
weave.SetYYarnSpacings(2, 0.83)
weave.SetYYarnWidths(3, 0.83)
weave.SetYYarnHeights(3, 0.21)
weave.SetYYarnSpacings(3, 0.83)
weave.SetYYarnWidths(4, 0.83)
weave.SetYYarnHeights(4, 0.21)
weave.SetYYarnSpacings(4, 0.83)
weave.SetGapSize(0)
#weave.SetGapSize(0.001)
weave.AssignDefaultDomain()
textilename = AddTextile(weave)
textile = GetTextile(textilename)
print textile.GetType()
weave =textile.GetWeave()
weave.SetResolution(50)
sectionMesh = CSectionMeshRectangular (4,True)
print sectionMesh.GetType()
weave.AssignSectionMesh(sectionMesh)

I attached a picture of the interference rendering.

Thank you,

Sincerely,

Rodrigo

[louisepb]

Hi Rodrigo,

The algorithm to remove intersections does not always manage to remove all intersections. In the case of your textile the intersections are where the yarn travels up and over the yarn at right angles. You have specified the yarn width to be the same as the spacing which means that the textile will be very tightly packed - there is no space for the yarn to move from the upper to lower surface (or vice versa). If this is the case for your textile and increasing the yarn spacing (or reducing the yarn width) isn't an option then you will need to locally change the cross-sections of the yarns or move the positions of the nodes in order to remove the intersections.

Hope that helps,
Louise