Analytical prediction of moisture absorption/desorption in resin matrix composites exposed to aircraft environmentsThe moisture absorption/desorption behavior of resin matrix composites was mathematically modeled by classical diffusion theory using an effective diffusion coefficient. Good agreement was found between calculated moisture content and published data for T300/5208 graphite fiber reinforced epoxy matrix composite. Weather Bureau data for Langley Air Force Base and Norfolk, Va., were used to calculate the amount of moisture a T300/5208 composite panel would contain if exposed outdoors. Results obtained by using average monthly weather data for several high aircraft usage locations around the world suggest that, except for desert areas, geographical locations should have only minimal effect on the moisture absorption level reached in composites. Solar radiation data together with cloud and wind information were included in the analysis to estimate an effective temperature of the composite panel during ground exposure.
Document ID
19770042900
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Unnam, J. (Virginia Polytechnic Institute and State University Blacksburg, Va., United States)
Tenney, D. R. (NASA Langley Research Center Hampton, Va., United States)
Date Acquired
August 8, 2013
Publication Date
January 1, 1977
Subject Category
Composite Materials
Report/Patent Number
AIAA PAPER 77-400
Meeting Information
Meeting: Conference on Structures, Structural Dynamics and Materials