Effect of State of Stress on Compression Failure in Carbon/Epoxy Laminates

[+] Author and Article Information
Yong Ju Jee, Stephen R. Swanson

Department of Mechanical Engineering, University of Utah, Salt Lake City, UT 84112

J. Eng. Mater. Technol 117(3), 347-350 (Jul 01, 1995) (4 pages) doi:10.1115/1.2804550 History: Received January 24, 1994; Revised September 04, 1994; Online November 27, 2007


Compression loadings in thick composites can in some cases lead to three-dimensional states of stress with a compressive mean stress. A model is developed in the present work that attempts to incorporate this compressive mean stress into a prediction for compression strength of carbon/epoxy fiber composites. The model assumes that the fibers have an initial misalignment, and that composite failure occurs when the fiber-matrix bond strength is exceeded. Literature values for the effect of pressure on bond strength are included. Comparisons with experimental data support the predicted increase in compression strength with pressure.

Copyright © 1995 by The American Society of Mechanical Engineers
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