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· For the bone shaped configuration
(b) tested in compression, the difference between the Poisson's
ratio of
the matrix and the fiber induces a tensile stress in the neck region normal
to the surface of the fiber.
· For
the compressive applied stress σc
, the normal stress is given by:
σN = σc(νm - νf)
Ef /{(1 + νm)Ef + (1 - νf - 2νf2 ) Em}
where
νi is the Poisson's ratio of
the material i.
· Observation
of the compressive stress required to induce debonding between the matrix and
the fiber gives the tensile strength of the bond.
· These tests require accurate alignment of the systems
and a transparent matrix to facilitate detecting debonding.
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