Accession Number:

ADA031436

Title:

Moisture Absorption and Desorption of Composite Materials

Descriptive Note:

Annual technical rept. Mar 1975-Mar 1976

Corporate Author:

MICHIGAN UNIV ANN ARBOR DEPT OF MECHANICAL ENGINEERING AND APPLIED MECHANICS

Personal Author(s):

Report Date:

1976-06-01

Pagination or Media Count:

72.0

Abstract:

Expressions are presented for the moisture distribution and the moisture content as a function of time of one dimensional homogeneous and composite materials exposed either on one side or on both sides to humid air or to water. The results apply during both moisture absorption and desorption when the moisture content and the temperature of the environment are constant. Test procedures are described for determining experimentally the values of the moisture content and the diffusivity of composite materials. A series of tests using unidirectional and Graphite T-300 Fiberite 1034 composites were performed in the temperature range 300-425 K with the material submerged both in moist air humidity 0 to 100 and in water. The test data support the analytical results and provide the moisture absorption and desorption characteristics of such composites. Extension of the results to materials exposed to time varying environmental conditions is indicated. Attempts were made to correlate the moisture content of the material with 1 changes in electric resistance and 2 changes in the hardness of the material. The latter method promises to provide an indication of the moisture content.

Subject Categories:

  • Ceramics, Refractories and Glass
  • Laminates and Composite Materials
  • Textiles
  • Plastics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE