Thermally Induced Twist in Graphite-Epoxy Tubes

[+] Author and Article Information
M. W. Hyer

Department of Mechanical Engineering, University of Maryland, College Park, MD 20742

C. Q. Rousseau

Aircraft Engine Business Group, General Electric Co., Cincinnati, OH 45215

S. S. Tompkins

Applied Materials Branch, NASA Langley Research Center, Hampton, VA 23665

J. Eng. Mater. Technol 110(2), 83-88 (Apr 01, 1988) (6 pages) doi:10.1115/1.3226034 History: Received November 11, 1987; Online September 15, 2009


This paper discusses an analytical and experimental study to investigate the thermally induced twist in laminated angle-ply graphite-epoxy tubes. Attention is focused on balanced laminates which, contrary to intuition, exhibit twist when the temperature is changed. The twisting is due to the fact that in tube a lamina with a + Φ orientation and a lamina with a − Φ orientation must be at slightly different radial positions. The lamina with the greater radial position determines the sense of the twist. Classical lamination theory does not predict this phenomenon and so a more sophisticated theory must be employed. This paper outlines such a theory, which is based on a generalized plane deformation elasticity analysis, and presents experimental data to confirm the predictions of the theory. A brief description of the experimental apparatus and procedure used to measure twist is presented.

Copyright © 1988 by ASME
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