Table II.

Pros and cons of each construction process, and their properties

Construction processProsConsProperties of fabric
BraidingExcellent for cylindrical components due to the production of continuous linear material
Can be draped around complex shaped mandrel
Capable of braiding non-continuous cross-sections, either hollow or solid
Cost effective technique for wide range of composite preforms
Fabric width and preform size is limitedExcellent shear resistance
High energy absorbing capability
WeavingHigh production speeds
2D weaving machines can be easily adapted to produce 3D fabrics
Various weft insertion methods to allow curved edges
Advances in jacquard mechanics and motors permits variable shedding geometries, and when combined with appropriate weft insertion methods, tailored net-shape preforms can be produced
Fixed maximum width
Slow machine set-up due to warping process
Provides the highest strength and stability
High dimensional stability
High yarn packing density
Increased resistance to impact damage
High compressive strength in 3D woven
KnittingHigh drapeability/formability and extensibility
Can form to complex shapes
Variable widths achieved through shaping capabilities
Quick and easy changes to yarn selection
Loop structure can lead to slight distortion of fabric during manufacture of composite
High curvature of yarns results in reduction in mechanical properties, such as reduced in-plane stiffness and strength
Lower fibre volume fraction compared to woven
High elastic behaviour (dependent on appropriate selection of yarns)
Good energy absorbing characteristics

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