Quiz: Section 1.1 Introduction

1. Composites are easy to repair.

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

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

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

5. Which is NOT a significant fiber factor that contributes to the mechanical performance of a composite?

6. What fiber factors contribute to the mechanical performance of a composite?

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. A composite is structural material?  What is it defined as? (Choose most appropriate answer)

9. Reducing one pound of mass in a commercial aircraft can save up to how many gallons per year?

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