Question

Reinforcing material which possesses highest tensile strength from the following is:

• A. Si\(_3\)N\(_4\) fiber
• B. S-glass fiber
• C. SiC fiber
• D. Graphite fiber

Hint:

\textbf{Graphite (carbon) fibers} offer the highest tensile strength and are essential in lightweight, high-strength composite applications.

Answer 1

The Correct Option is D

Step 1: Understanding Reinforcing Materials
Reinforcing fibers are used in composite materials to enhance mechanical properties such as tensile strength, modulus, and thermal stability. Step 2: Tensile Strength Comparison
Among the options: - Graphite fiber (also known as carbon fiber) is known for its exceptionally high tensile strength, often exceeding 4000 MPa. - Si\(_3\)N\(_4\) and SiC fibers are strong ceramics, but typically lower in tensile strength compared to graphite. - S-glass fiber has high strength and is used in aerospace, but graphite fibers outperform it in tensile performance. Step 3: Applications of Graphite Fiber
Graphite fibers are widely used in: - Aerospace and defense, - High-performance sports equipment, - Automotive lightweight structures. Conclusion: Graphite fiber exhibits the highest tensile strength among the listed options.