Delamination Fracture Toughness of Graphite and Aramid Epoxy Composites

[+] Author and Article Information
H. Saghizadeh, C. K. H. Dharan

Department of Mechanical Engineering and Center for Advanced Materials, University of California, Berkeley, Calif.

J. Eng. Mater. Technol 108(4), 290-295 (Oct 01, 1986) (6 pages) doi:10.1115/1.3225885 History: Received October 08, 1985; Online September 15, 2009


The delamination fracture toughness of graphite and aramid-epoxy composite laminates was determined as a function of loading rate for unidirectional and woven reinforcements. In addition, the in-situ fracture toughness of the epoxy matrix was obtained by determining the crack energy release rate during the delamination fracture of thin epoxy films. The fracture surfaces were investigated using scanning electron microscopy. The results show that increasing the loading rate and the use of woven reinforcements increase the fracture toughness. A model was used to estimate the relative contributions from the fiber-matrix interface and the matrix to the overall delamination crack energy release rate.

Copyright © 1986 by ASME
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