Micromechanics of Stress Transfer across the Interface fiber-matrix bonding
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Date
2019-12-30
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Abstract
The study and application of composite
materials are a truly interdisciplinary endeavor that has been
enriched by contributions from chemistry, physics, materials
science, mechanics and manufacturing engineering. The
understanding of the interface (or interphase) in
composites is the central point of this interdisciplinary
effort. From the early development of composite materials
of various nature, the optimization of the interface has
been of major importance. While there are many reference
books available on composite materials, few of them deal
specifically with the science and mechanics of the
interface of fiber reinforced composites. Even more
important, the ideas linking the properties of composites to
the interface structure are still emerging. A number of
experimental techniques have been devised to measure the
mechanical properties of the fiber-matrix and laminar
interfaces in composites. A number of analytical solutions
have been proposed in order to better understand the stress
transfer mechanism across the interfaces between the fiber and
the matrix. In our study, we need a direct characterization of
the interface; the micromechanical tests we are addressing
seem to meet this objective and we chose to use two
complementary tests simultaneously. The microindentation
test that can be applied to real composites,and the drop test,
preferred to the pull-out because of the theoretical possibility
of studying systems with high adhesion (which is a priori the
case with our systems). These two tests are complementary
because of the principle of the model specimen used for both
the first "compression indentation" and the second whose fiber
is subjected to tensile stress called the drop test. Comparing
the results obtained by the two methods can therefore be
rewarding.
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Keywords
Interface, Micromechanics, pull-out, Composite, Fiber, Matrix.