Abstract:
(INTRODUCTION)
The objectives in this study were to
determine the through-thickness elastic
constant of fiber-epoxy/metal composites
with ultrasonic measurements and
determine the elastic constants of the
constituent layers. The specimens that we
studied consist of alternating layers of
aluminum (2024 T3) and fiber-epoxy , all
of which are 200 to 300 um thick. As
Figure 1 indicates the outer two layers of
the composite are aluminum, so that there
is always one additional layer of aluminum
in the composite.
The fiber-epoxy layers consist of a unidirectional layup of aramid fibers for the aramid-epoxy/aluminum specimens. For the glass-epoxy/aluminum specimen, the fiber-epoxy layers consist of two sublayers of unidirectional fibers where the fibers of one sublayer lie at 90° with respect to the other sublayer. Because the fibers of both sublayers are perpendicular to the transmitting transducer, the ultrasound perceives the two sublayers as a single layer.
Source: Proceedings of the 'NDE applied to Process Control of Composite Fabrication' - Conference, 1-2 Oct 1996 St. Louis, Missouri. Publisher and Organizer: Nondestructive Testing Information Analysis Center (NTIAC) Texas Research Institute Austin, Inc. Austin, Texas [http://www.ntiac.com] [Buying the Proceedings]
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