The Effect of Stress on Diffusion in Composites - Experimental Observations

Abstract

This paper is concerned with the investigation of the effect of anisotropy on the sorption characteristics of benzene by a glass-epoxy (60% Epon 815-40% Versamid 140) COMPOSITE SYSTEM. The objective is to characterize the effect of the unidirectional glass filaments at various orientations on the rate and mode of sorption and to establish the applicability of expressions of the form Fi = DijC,j where Fi is the flux and Dij is a second order diffusion coefficient for describing diffusion in our composite system. A one- dimensional diffusion experiment is performed to establish the effect internal stresses have in modifying the sorption rate of the homogeneous epoxy matrix material. The presence of competing mechanisms which control the rate and mode of sorption by the composite system is revealed. The analysis of stress in the one-dimensional diffusion specimens using a finite element method (elastic solution) shows an increase in the deviatoric tensile stress in the direction of the flux increases the rate of sorption.

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Document Details

Document Type
Technical Report
Publication Date
Feb 01, 1974
Accession Number
AD0774964

Entities

People

  • D. C. Ruhmann
  • E. M. Wu

Organizations

  • Monsanto

Tags

Communities of Interest

  • Space

DTIC Thesaurus Topics

  • Composite Materials
  • Contracts
  • Department Of Defense
  • Diffusion Coefficient
  • Engineering
  • Epoxy Composites
  • Epoxy Resins
  • Equations
  • Finite Element Analysis
  • Materials
  • Measurement
  • Military Research
  • Observation
  • Organic Solvents
  • Tensile Stress
  • Unidirectional
  • Universities

Readers

  • Combustion science or combustion engineering.
  • Mechanical Engineering/Mechanics of Materials.
  • Polymer Science and Engineering.