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OVERVIEW OF TEXTILES
2-19
The minimum and maximum braid angles are limited by the phenomenon of
jamming, which is related to the maximum shear distortion that can be put on a fabric.
Jamming also limits the ratio of the minimum and maximum radii of the mandrel.
b) 1x1 Triaxial Braid, Axial Yarns at
Alternate Crossovers
c) 1x1 Triaxial Braid, Axial Yarns at
Each Crossover
d) 2x2 Triaxial Braid
Axial Yarns
Braider
Yarns
a) 1x1 Bias Braid
θ
Braid Angle
Rhomboidal
Unit Cell
Rectangular
Unit Cell
Smallest
Rectangular
Unit Cell
Smallest
Rectangular
Unit Cell
Figure 2-13. Some common 2D braid patterns.
The total thickness of a braided part may be controlled by overbraiding, in which
multiple passes of the mandrel are made through the braiding machine. This lays down a
series of nearly identical layers, similar to a lamination. For 2D braiding, there is no
mechanical connection between the layers.
A convenient notation for triaxial braids is