Hybrid composites are increasingly being used in infrastructure, oil recovery, and aerospace applications. These hybrids generally combine two different types of fibers to reinforce the resin, thereby gaining some of the advantageous properties of both fibers. Typically, carbon and glass are used since this combines the high performance of the carbon with the low cost of the glass. The performance of such materials depends on a number of factors, including the mix ratio of the fibers as well as the fiber and void contents. At present, there is no simple way to determine these features. Although a number of techniques exist for measuring such parameters when only a single reinforcement is present, extension of these methods to hybrids can be difficult. The work here, however, shows that one technique, the burn off test in ASTM D 3171-99, can be extended to characterize carbon/glass hybrids. To verify this procedure, data were obtained for a series of samples with known compositions, and the agreement was excellent. The proposed method has minimal equipment requirements and provides a simple way to obtain important compositional information.


ASTM Standard D 3171-99:
Test Methods for Constituent Content of Composite Materials
Annual Book of ASTM Standards
ASTM International
West Conshohocken, PA
Certain commercial materials and equipment are identified in this study for adequate definition of the experimental procedure. In no instance does such identification imply recommendation or endorsement by the National Institute of Standards and Technology, nor does it imply that the materials or instruments are necessarily the best available for this purpose.
Handbook of Composites
, Ed.,
Van Norstrand Publishing Company
New York
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