Question

Fiber strengthening is effective in:

• A. Isotropic materials
• B. Anisotropic materials with aligned fibers
• C. Materials with high dislocation density
• D. Materials with fine grain size

Hint:

Fiber strengthening works best in anisotropic materials where fibers are aligned along the loading direction, giving high directional strength and stiffness.

Answer 1

The Correct Option is B

Fiber strengthening is a method of reinforcement used in composite materials, where strong, stiff fibers (like carbon, glass, or aramid) are embedded in a matrix material (such as a polymer).
This technique is highly effective when the fibers are aligned in the direction of the applied load, making the material anisotropic — meaning its properties vary depending on the direction of loading.
Aligned fibers greatly enhance the strength and stiffness in their orientation direction, which is why fiber-reinforced composites are widely used in aerospace, automotive, and sports equipment industries.
- Isotropic materials exhibit uniform properties in all directions and do not benefit significantly from directional reinforcement.
- High dislocation density and fine grain size are mechanisms related to metallic strengthening (like strain hardening and grain boundary strengthening), not fiber reinforcement.