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Proceedings Paper

Displacements and strains in thick-walled composite rings subjected to external pressure using moire interferometry
Author(s): Harold E. Gascoigne; Mohamed G. Abdallah
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Paper Abstract

Through the utilization of moiré interferometry, in-plane displacements and strains are determined in the radial cross-section of a laminated graphite-epoxy ring subjected to external hydrostatic pressure containing isolated wrinkled (wavy) ply regions. Wrinkled plies arising during manufacturing often occur in thick cylindrical composite sections and their presence raises questions as to their influence on structural integrity. The determination of strains in these anomalous wavy regions will provide valuable information by which these questions will be answered. A specially developed test apparatus which produces the external pressure loading on ring specimens is described. Displacements and strains are presented for two regions of a laminated, cross-ply graphite-epoxy ring -- one region is relatively free of wrinkles while the other region contains an isolated, approximately symmetrical group of wavy plies. The marked effect of wavy plies on the distribution of strain in this ring is clearly demonstrated.

Paper Details

Date Published: 1 December 1991
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Proc. SPIE 1554, Second International Conference on Photomechanics and Speckle Metrology, (1 December 1991); doi: 10.1117/12.57414
Show Author Affiliations
Harold E. Gascoigne, California Polytechnic State Univ. (United States)
Mohamed G. Abdallah, Hercules Advanced Materials and Systems Co. (United States)


Published in SPIE Proceedings Vol. 1554:
Second International Conference on Photomechanics and Speckle Metrology
Fu-Pen Chiang; Fu-Pen Chiang, Editor(s)

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