Water intrusion in thin-skinned composite honeycomb sandwich structuresThin-skinned composite honeycomb sandwich structures from the trailing edge of the U.S. Army's Apache and Chinook helicopters have been tested to ascertain their susceptibility to water intrusion as well as such intrusions' effects on impact damage and cyclic loading. Minimum-impact and fatigue conditions were determined which would create microcracks sufficiently large to allow the passage of water through the skins; damage sufficient for this to occur was for some skins undetectable under a 40X-magnification optical microscope. Flow rate was a function of moisture content, damage, applied strain, and pressure differences.
Document ID
19890042087
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Jackson, Wade C. (NASA Langley Research Center Hampton, VA, United States)
O'Brien, T. Kevin (NASA Langley Research Center; U.S. Army, Aerostructures Directorate, Hampton VA, United States)
Date Acquired
August 14, 2013
Publication Date
January 1, 1988
Subject Category
Composite Materials
Meeting Information
Meeting: National Technical Specialists'' Meeting on Advanced Rotorcraft Structures