What is the definition of fiber volume fraction?
(A) Volume of Composite/Volume of Fibers
(B) 1 plus the Matrix Volume Fraction.
(C) Volume of Fibers/Volume of Composite.
(D) Volume of Fibers/Volume of Matrix.
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.
(A) less than 2 percent.
(B) 2 to 10 percent.
(C) greater than 15 percent.
(D) 2 to 15 percent.
What tests determine the volume fraction of voids?
(A) burn or acid digestion tests.
(B) shear tests.
(C) impact tests.
(D) tension tests.
What is the formula for finding the void fraction?
(A) (theoretical minus experimental
composite density)/experimental
composite density.
(B) void volume/(fiber volume plus
composite volume).
(C) (experimental minus theoretical
composite density)/experimental
composite density.
(D) (theoretical minus experimental
composite density)/theoretical
composite density.
The decrease in mechanical properties due to voids depends on the following (check all that apply)
(A) shape of voids
(B) Young’s moduli of fiber
(C) size of voids
(D) location of voids