Accession Number : ADA306679

Title :   Moisture Diffusion Analysis in Multilayer Composite Materials by Finite Difference Analysis.

Descriptive Note : Interim rept. 1 Jan 95-1 Jan 96,

Corporate Author : NAVAL SURFACE WEAPONS CENTER WHITE OAK LAB SILVER SPRING MD

Personal Author(s) : Augl, Joseph M. ; Berger, Alan E.

PDF Url : ADA306679

Report Date : MAR 1996

Pagination or Media Count : 59

Abstract : This report provides a FORTRAN source code for calculating the moisture uptake, diffusion, and internal distribution through the thickness of multi-layered composite sandwich materials as a function of time. This finite difference diffusion code (FDDC) was designed as a handy tool for materials engineers and electronics engineers who have no easy access to a finite element diffusion code (FEDC), yet who have a need to study long-term moisture effects on composites or sandwich structures. A unidirectional diffusion analysis through laminated plates or sandwich panels with many different material layers, for many different environments, can be performed within a few seconds of CPU time. The code can be run on Macintosh or IBM-compatible computers. A sample run is provided which may serve as a tutorial and also as a comparison with a previously run finite element analysis of the same problems. The differences in the sample runs for the calculated moisture concentrations of the FDDC and FEDC analyses were insignificant (less than one-half percent).

Descriptors :   *EPOXY LAMINATES, COMPUTER PROGRAM DOCUMENTATION, MATHEMATICAL MODELS, SPATIAL DISTRIBUTION, FINITE ELEMENT ANALYSIS, TIME SERIES ANALYSIS, INPUT OUTPUT PROCESSING, COMPOSITE STRUCTURES, MATRIX MATERIALS, GLASS, MOISTURE CONTENT, FORTRAN, FINITE DIFFERENCE THEORY, DIFFUSION, SOLUBILITY, EPOXY COMPOSITES, MOISTURE, HUMIDITY, SANDWICH CONSTRUCTION, SANDWICH PANELS, POLYVINYL CHLORIDE.

Subject Categories : Laminates and Composite Materials
      Computer Programming and Software

Distribution Statement : APPROVED FOR PUBLIC RELEASE