Composite Materials - Processing of Fiber Reinforced Composites

5 important questions on Composite Materials - Processing of Fiber Reinforced Composites

What techniques are there to orient large amounts of fibers in the same direction within a composite?

Pultrusion, Prepreg production and filament winding.

For what materials is pultrusion mostly used?

For composites consisting of components of continuous lengths and a constant cross-sectional shape.

How does the technique of pultrusion work?

Continuous fiber, or roving, is drawn and impregnated with a thermosetting resin.
After impregnation it passes trough a preforming steel die that preforms to the desired shape.
The stock then passes a curing die, which determines the final shape and initiate curing of the resin matrix.
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How does the prepregging process work?

The prepregging begins with sandwiching the continuous fibers between release and carrier paper. This process is called calendering.
The release paper is coated with a thin film of resin.

How does the process of filament winding work?

The fiber are first fed trough a resin bath and than wound around a mandrel. When enough layers are applied the material is cured, after which the mandrel is removed.

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