Quiz: Section 3.2 Volume and Mass Fractions, Density, and Void Content

1. What is the definition of fiber volume fraction?

Volume of Composite/Volume of Fibers

1 plus the Matrix Volume Fraction.

Volume of Fibers/Volume of Composite.

Volume of Fibers/Volume of Matrix.

2. Several properties of a composite change when voids are present. For a 1% increase in void content, what is the range of change in these properties.

less than 2 percent.

2 to 10 percent.

greater than 15 percent.

2 to 15 percent.

3. What tests determine the volume fraction of voids?

burn or acid digestion tests.

shear tests

impact tests.

tension tests.

4. What is the formula for finding the void fraction?

(theoretical minus experimental composite density)/experimental composite density.

void volume/(fiber volume plus composite volume).

(experimental minus theoretical composite density)/experimental composite density.

(theoretical minus experimental composite density)/theoretical composite density.

5. The decrease in mechanical properties due to voids depends on the following (check all that apply)

shape of voids

Young’s moduli of fiber

size of voids

location of voids

Quiz: Section 3.2 Volume and Mass Fractions, Density, and Void Content

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