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GeoDict User Guide 2025

FiberGeo

Use FiberGeo to generate and model fibrous structures. Starting from random distributions of fibers, FiberGeo creates virtual non-woven and fiber reinforced composites.

To generate fibrous material models, FiberGeo requires the input of fiber material and form, and the desired statistical properties of the resulting structure, such as size, amount of the solid phase, etc. The fibers can be straight or curved, where the profile shape can be varied (circular, elliptical, rectangular, cellulose, etc.). The orientation of fibers and the distribution of fiber parameters can be specified. It is possible, for example, to generate structures with prescribed solid volume percentage, prescribed density or prescribed grammage.

FiberGeo_titlepage

FiberGeo fibrous structures are based on given statistical properties that can be estimated e.g. from 3D images (CT-scan), from 2D images like REM, from certain material properties or from the knowledge of the underlying production process. These properties can also be computed in GeoDict directly from the scan using the module FiberFind. The generated non-woven models are available as 3-dimensional images and as analytical data (GAD, GeoDict analytic data), which can be used to export surface triangulations (stl-files) for CAD-programs.

Other material properties like pore-size distribution, flow resistivity (permeability, pressure drop), effective thermal and electrical conductivity, effective elasticity, effective diffusion, filter efficiency, filter capacity, and many more, can be calculated directly on the geometry models, using other GeoDict modules, e.g. PoroDict, ConductoDict, FlowDict, ElastoDict, DiffuDict, or FilterDict.

Important application areas are the production of glass fiber and carbon fiber reinforced composites, fibrous insulation materials, gas diffusion layers in fuel cells, filter media, dewatering felts, and many others.

Additionally, a FiberGeo license offers the possibility to generate Gaussian Random Fields, which can be segmented to structures as described here.

Topics of FiberGeo:

  • FiberGeo section
    Access the available FiberGeo commands via the FiberGeo section.
  • Create Fibers
    With Create, fibrous structures with user-defined parameters can be generated. The fibers appear randomly in the domain.
  • Pile Fibers
    Let the fibers fall from the top of the domain and settle in their final position after shifts and rotations.
  • Distribute
    If object information is available, fibers can be redistributed in the given volume. For example, such information is available after creating a structure with FiberGeo. Distributing the fibers is often used after a piling step to obtain a more homogeneous material.
  • Add Binder
    Add material in the shape of a concave meniscus in locations where fibers in that structure are close together. This models binder in fibrous structures.
  • Fiber GeoApps
    Create predefined materials from different application areas.

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