Bundle-Debond Technique for Characterization of Moisturized Kevlar/Phenolic Interfaces


An experimental technique called bundle-debond, is used to study the effect of water on the debonding of kevlar fiber bundles and phenolic matrix. The specimen is double notched with a single layer of kevlar fibers in between the notches. Load transfer between the top and bottom piece of the specimen occurs through the interface of a single layer of fibers. Two additional fiber layers are inlaid on the faces of the specimen in order to prevent possible tensile failure of the matrix. An accelerated test is conducted to study the effect of water on the fiber/matrix interface. The notched specimens are boiled in water for 24 hrs. Tensile loads are applied on the specimen resulting in interfacial debond. The experimental data are analyzed using a simple shear-lag theory. It is found that the interfacial shear strength of kevlar/phenolic reduced by about 12% due to absorption of water. The strain energy density of the interface is approximately 8 times lower than that of the pure matrix at failure.


Mechanical and Aerospace Engineering

Second Department


Document Type

Article - Conference proceedings

Document Version


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© 1992 American Society of Mechanical Engineers (ASME), All rights reserved.

Publication Date

01 Jan 1992

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