文档介绍：Polymer Testing 7 (1987) 405-418
A New Method to Study the Fiber-Matrix Interface
in posite Materials: Application for
Carbon Fiber-posites
P. Perret ~'~, J. F. Gerard ~ & B. Chabert b
a Laboratoire des Mat6riaux Macromol6culaires--RS 507, Institut National des
Sciences Appliqu6es de Lyon, 69621 Villeurbanne Cedex, France
b Laboratoire d'Etudes des Mat6riaux Plastiques et Biomat6riaux--RS 507,
Universit6 'Claude Bernard' Lyon I, 69622 Villeurbanne Cedex, France
ABSTRACT
Numerous studies have been done on the nature of the fiber-matrix
interface and on the role of this interface in mechanical properties of
epoxy-carbon posite materials. In this study, we describe a
new test to study the fiber-matrix interface in posites
by dynamic shear testing along the fiber axis. This method, based on
three scans with increased dynamic displacement amplitude, enables us
to study the recovery of mechanical properties and appearance of
damage in the material. For carbon fiber-epoxy pos-
ite materials, it is possible to distinguish two ranges in the amplitude of
dynamic displacement: a first for which a recovery for G' and tan 6 is
observed and a second for which permanent damage appears. The
influences of fiber surface treatments such as oxidation and~or sizing on
dynamic behavior are clearly displayed by this test.
1 INTRODUCTION
Composite materials are produced by addition of fillers to polymers to
improve many mechanical properties. They are increasingly used in
aerospace for their excellent properties and their low weight. It is
interesting to underline that they have specific dynamic properties,
different from other materials. For example, compared with metallic
structures, posites based on polymeric matrices can display
a continuous deterioration of their properties from the beginning of
fatigue experiments. 1-3
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Polymer Testing 0142-9418/87/$03-50 (~ 1987 Elsevier Science Publis