Carbon Fibers by Soo-Jin Park

Author:Soo-Jin Park
Language: eng
Format: epub, pdf
Publisher: Springer Singapore, Singapore

6.2.4 Unidirectional

Unidirectional reinforcements include tapes, tows, unidirectional tow sheets, and rovings (which are collections of fibers or strands). Fibers in this form are all aligned parallel in one direction and uncrimped providing the highest mechanical properties (Fig. 6.4).

Fig. 6.4 Relationship between strength and fiber orientation

Composites using unidirectional tapes or sheets have high strength in the direction of the fiber. Unidirectional sheets are thin, and multiple layers are required for most structural applications .

In some composite designs, it may be necessary to provide a corrosion or weather barrier to the surface of the product. A surface veil is a fabric made from nylon or polyester that acts as a very thin sponge, which is capable of absorbing resin to 90% of its volume. This helps to provide an extra layer of protective resin on the surface of the product. Surface veils are used to improve the surface appearance and ensure the presence of a corrosion-resistance barrier for typical composite products such as pipes, tanks, and other chemical process equipment. Other benefits include increased resistance to abrasion, ultraviolet (UV), and other weathering forces. Veils may be used in conjunction with gel coats to provide reinforcement to the resin.

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