Strain Measurement in the Wavy-Ply Region of an Externally Pressurized Cross-Ply Composite Ring

[+] Author and Article Information
H. E. Gascoigne

Department of Mechanical Engineering, California Polytechnic State University, San Luis Obispo, CA 93407

M. G. Abdallah

Hercules Materials Company, Magna, UT 84044

J. Eng. Mater. Technol 118(3), 325-329 (Jul 01, 1996) (5 pages) doi:10.1115/1.2806813 History: Received January 13, 1995; Revised August 14, 1995; Online November 27, 2007


Ply-level strains are determined in the cross-section of an externally pressurized cross-ply (3:1 circumferential to axial fiber ratio) graphite-epoxy ring containing an isolated circumferential wavy region. A special test fixture was used which permitted measuring orthogonal displacement components in the wavy area using moiré interferometry as the pressure was increased. Strain components were determined at selected locations in the wavy area up to approximately 90 percent of failure pressure. The study shows: (1) Large interlaminar shear strains, which are non-existent in the “perfect” ring, are present near the wave inflection points; (2) The wavy plies generate increased interlaminar normal compressive strains in both circumferential and axial plies along a radial line coinciding with maximum wave amplitude; and (3) Nonlinear strain response begins at approximately 60 percent of failure pressure.

Copyright © 1996 by The American Society of Mechanical Engineers
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