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· When the fiber fracture strain
is greater than that of the matrix, two distinct failure modes occur in different
ranges of Vf .
· For
Vf < V'f, the composite strength depends
upon the fracture strength of the matrix. The composite fails upon load transfer
to the fibers at matrix fracture. This fracture stress is given by:
σ*C1
= σ'f
Vf + σ*m
(1
- Vf ).
· At values
of Vf > V'f , load transfer to the fibers
upon matrix fracture does not cause fiber fracture. The fracture stress
of the composite then depends linearly on the fiber content: σ*C1 = σ*f Vf
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