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The Effects of Crushing Surface Roughness on the Crushing Characteristics of Composite Tubes

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The effects of crushing surface roughness on the energy‐absorption capability of graphite and glass‐epoxy composite tubes were investigated. Fifty different combinations of fiber, matrix, and specimen ply orientation were evaluated. Two different crushing surface raughnesses were used in this investigation. Crushing surface significantly influences the energy‐absorption capability only of tubes that crush in the lamina bending crushing mode; tubes that crush in other modes are not influenced because their lamina bundles do not slide against the crushing surface. Those tubes that crush in the lamina bending mode can achieve higher, lower, or no change in energy‐absorption capability as crushing surface roughness increases. If the fiber failure strain of tubes that crush in the lamina bending crushing mode exceeds the matrix failure strain then the energy‐absorption capability increases as crushing surface roughness increases. However, if the matrix failure strain exceeds the fiber failure strain then the energy‐absorption capability increases as crushing surfnce roughness decreases. Energy‐absorption capability is uninfluenced by crushing surface roughness for tubes that have equal fiber and matrix failure strains.

Document Type: Research Article


Affiliations: Aerostructures Directorate, Langley Research Ctr., Hampton, Va.

Publication date: July 1, 1992

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  • The Journal of the American Helicopter Society is the world's only scientific journal dedicated to vertical flight technology. It is a peer-reviewed technical journal published quarterly by AHS International and presents innovative papers covering the state-of-the-art in all disciplines of rotorcraft design, research and development. (Please note that AHS members receive significant discounts on articles and subscriptions.)

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