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. What is the unit of fracture toughness in the SI system?

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

5. Where are advanced composites primarily used?

6. 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?

7. Primary material selection parameters for metals are strength, affordability, corrosion resistance, and formability. What are the other two?

8. A steel wire will generally have __________ order of Young’s modulus than the bulk steel it is made from.

9. To measure normal strain experimentally by a strain gage at a point in the body, I need to know __________ of the body

10. What is the percentage annual growth of composites?