Engineering Board Exam Reviewer · Engineering Materials · medium

A composite contains 60% by volume carbon fibers ( = 1.8 g/cm3) in epoxy ( = 1.2 g/cm3). What is its density?

1. 1.50 g/cm3
2. 1.44 g/cm3
3. 3.00 g/cm3
4. 1.56 g/cm3

Answer

D. 1.56 g/cm3

Solution

c = Vf f + Vm m = 0.6(1.8) + 0.4(1.2) = 1.56 g/cm3.

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