Quiz: Section 1.1 Introduction

1. The area of the fiber-matrix interface for a fixed volume of fibers in a composite is inversely proportional to the d^p, where  is the diameter of the fiber. What is the value of ^p?

2. What is the most common cross-sectional shape of fibers?

3. Fibers are of thin diameter because they have ______________ than the bulk material

4. What is the percentage annual growth of composites?

5. Advanced composites are

6. Other than Young’s modulus, what does the flexibility of a circular rod depend on?

7. The lightest mass of the beam required to take a tensile load depends on the ratio E^a/ρ (E=Young’s modulus, ρ=density). What is the value of a?

8. Composites are easy to repair.

9. The lightest mass of the beam required to take a compressive load and avoid buckling depends on the ratio E^a/ρ (E=Young’s modulus, ρ=density). What is the value of a?

10. What is the largest ingredient in glass fibers?