What is a typical benefit of using unidirectional continuous fiber reinforcement in composites?

• A. High transverse strength
• B. High axial strength along the fiber direction
• C. Lower stiffness
• D. Higher density

Answer: (B)

Unidirectional continuous fiber reinforcement concentrates everything along one direction, so the fibers carry the majority of the load when it’s applied along their length. Carbon or glass fibers have much higher strength and stiffness than the surrounding resin, and because the fibers are continuous and aligned, load transfer along that axis is highly efficient. This creates a material that is extremely strong and stiff in the fiber direction, which is the main benefit. In the transverse direction, there are few or no fibers to carry load, so properties are much lower, and density or other factors don’t define the primary advantage here.