Engineering Board Exam Reviewer · Engineering Materials · hard

A unidirectional composite has 60% by volume carbon fibers (E = 230 GPa) in an epoxy matrix (E = 3.5 GPa). What is its transverse modulus (isostress)?

  1. 139.4 GPa
  2. 94.1 GPa
  3. 3.50 GPa
  4. 8.55 GPa

Answer

D. 8.55 GPa

Solution

Inverse rule of mixtures: 1/Et = Vf/Ef + Vm/Em = 0.6/230 + 0.4/3.5 Et = 8.55 GPa.

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