Accession Number : ADA315523

Title :   Practical Guidelines for Moisture Diffusion Measurements in Composites.

Descriptive Note : Interim rept. 1 Jan-1 Jul 96,

Corporate Author : NAVAL SURFACE WARFARE CENTER CARDEROCK DIV SILVER SPRING MD

Personal Author(s) : Augl, Joseph M.

PDF Url : ADA315523

Report Date : JUL 1996

Pagination or Media Count : 67

Abstract : Composite powder samples and thin sheet laminates were investigated for their moisture absorption behavior. Knowledge of the maximum moisture equilibrium concentrations in composites as a function of the surrounding relative humidity is necessary for determining their moisture diffusion coefficients. While thin sheet laminates gave the same solubility values as thick laminates, powder samples of the same laminates gave about 25 percent higher values. These apparently higher solubilites in composite powder samples were attributed to the larger surface area per unit mass. Based on these findings, procedural guidelines were proposed for increasing the efficiency in determining the diffusion coefficients in composite materials.

Descriptors :   *COMPOSITE MATERIALS, *LAMINATES, *DIFFUSION COEFFICIENT, *MOISTURE, THICKNESS, POWDERS, SURFACES, SHEETS, SAMPLING, THINNESS, ABSORPTION, SOLUBILITY, HUMIDITY.

Subject Categories : Laminates and Composite Materials
      Physical Chemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE