2.1.2. UD Composite

Unidirectional composites consist of fibers oriented in the same direction, surrounded by a matrix material.

Figure 2.4: UD Composite Geometry Options

UD Composite Geometry Options

  • Geometry Type: Control the arrangement of fibers in cross section within the matrix.

    • Square: Cross section of fibers within RVE has fibers arranged as the vertices of a square.

    • Diamond: Cross section of fibers within RVE has fibers arranged as the vertices of a diamond.

    • Hexagonal: Cross section of fibers within RVE has fibers arranged as the vertices of a hexagon.


    Note:  In general, only the Hexagonal geometry type will lead to a transversely isotropic material.


  • Fiber Volume Fraction: The fraction of space within the RVE that the fiber material occupies.

  • Fiber Diameter: The diameter of the individual fibers in the active unit system.

  • Repeat Count: The number of times that the unit cell is repeated in each coordinate direction.

  • Length Ratio XZ: The ratio of the RVE length in the X direction divided by the length in Z direction.