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Creating Textile Models using TexGen
Materials, Mechanics and Structures Research Division
Faculty of Engineering
The University of Nottingham
2nd May 2012
Louise Brown
2nd May 2012 TexGen Workshop
Generating a Textile
Each step individually using
either GUI, Python script or C++
API functions
Steps
combined and
performed
automatically in
2D and 3D
wizards
3 - Specify domain
4 - Output data
Create yarn path
Assign sections
Select interpolation
Assign repeats
Assign fibre properties
1 - Create Textile
2 - Add yarns
2nd May 2012 TexGen Workshop
2D Weave Wizard
Used for creating 2D plain, twill or satin weaves
2nd May 2012 TexGen Workshop
3D Weave Wizard
Orthogonal weave
2nd May 2012 TexGen Workshop
Angle interlock
Offset angle interlock
Layer to layer
2nd May 2012 TexGen Workshop
Create Textile using script or User
Interface
• Select Textiles -> Create Empty
( Step 1 )
• Use options in Modeller to create
yarn (Step 2)
Textile = CTextile()
Yarn = CYarn()
Yarn.AddNode(CNode(XYZ(0,0,0)))
Yarn.AddNode(CNode(XYZ(5,0,1)))
Yarn.AddNode(CNode(XYZ(10,0,0)))
Create Yarn
2nd May 2012 TexGen Workshop
Yarn Path Interpolation
• Select Modeller -> Interpolation
• Bezier spline
• Natural cubic spline
• Linear spline
• Periodic – select to maintain
continuity across yarn repeats
Yarn.AssignInterpolation(CInterpolationCubic())
# Defaults to periodic, send false for non-periodic interpolation
2nd May 2012 TexGen Workshop
Yarn Cross-sections
• Select Modeller -> Assign Section
• Select interpolation
• Constant
• Interpolate between nodes
• Interpolate between positions
•Select cross-section shape
•Ellipse
•Lenticular
•Power ellipse
•Hybrid
•Polygon (only by script or API
functions)
2nd May 2012 TexGen Workshop
YarnSections = CYarnSectionInterpNode()
YarnSections.AddSection( CSectionLenticular(1.0,0.5,0.1) )
YarnSections.AddSection( CSectionPowerEllipse(1.0,0.5,0.4,0.25) )
Top = CSectionEllipse( 1.0, 0.4 )
Bottom = CSectionPowerEllipse( 1.0, 0.4, 0.4, 0.25 )
YarnSections.AddSection( CSectionHybrid( Top, Bottom ) )
Yarn.AssignSection( YarnSections )
2nd May 2012 TexGen Workshop
Yarn Repeats and Domain
The domain restricts the model to a specific region ( typically, but not necessarily, the unit
cell)
• Either
• Select Domain -> Create Box
• Input minimum and maximum x, y, z values for bounding box
• Or
• Select Domain -> Create Planes
• Input required number of planes
Repeats
•Select Modeller -> Assign Repeats
• Input repeat vectors
• Here: 10,0,0 and 5,5,0
Yarn.AddRepeat(XYZ(10,0,0))
Yarn.AddRepeat(XYZ(5,5,0))
Textile.AddYarn(Yarn)
Textile.AssignDomain(CDomainPlanes(XYZ(-5,-2,-1), XYZ(15,12,2)))
AddTextile(“Workshop”, Textile)
2nd May 2012 TexGen Workshop
Save and Export Data
• File - > Save TexGen file...
– Saves in TexGen tg3 format
SaveToXML(“Workshop“, Textile)
• File - > Export
– IGES file
– STEP file
– Surface Mesh ( .vtu, .stl, .stlb )
– Volume Mesh: Tetrahedral mesh, best for 2D weaves (.vtu, .inp )
– Tetgen Mesh: Tetrahedral mesh using Tetgen software (.inp)
– ABAQUS File -> ABAQUS Dry Fibre File: Hex and wedge elements
-> ABAQUS Voxel File: Cuboidal hex elements
All ABAQUS exports include additional .ori and .eld files containing element orientation,
fibre volume fraction and yarn information.
2nd May 2012 TexGen Workshop
2nd May 2012 TexGen Workshop
Abaqus Voxel Export
Abaqus Dry Fibre Export
Thank you
2nd May 2012 TexGen Workshop
2nd May 2012 TexGen Workshop
3 Tex Orthogonal Weave
3Tex orthogonal weave scanned by x-ray
computed tomography (µCT)
Orthogonal 3D carbon fabric:µCT
images of weft (a,b) and warp
cross-sections (c).
Weft yarn: Width = 2.29mm, Height = 0.41mm
Warp yarn: Width = 1.94mm, Height = 0.43mm
Binder yarn: Width = 0.42mm, Height = 0.26mm
Repeat along warp/binder yarn length = 10.72mm
Repeat along weft yarn length = 9.44mm
(b)
(a)
(c)
