A STUDY OF STRESS CORROSION OF GLASS FIBERS.

Abstract

Tensile and static fatigue tests were made on E-glass filaments to determine the mechanism of stress corrosion that occurs in the presence of water vapor. Transmission electron microscopy and chemical analyses of the glass were used to provide supporting evidence. Mechanical tests in nominally sodium-free solutions in either sprayed or bulk forms showed no strength loss in alkaline solutions of pH 14, but progressively increasing strength loss as the pH was changed from 8 to 12. Sodium-containing solutions acted in a special manner that could be explained by a controlling chemical reaction: SiONa + H(+) -- SiOH + Na(+). In agreement with this ion exchange reaction, it was found that the strength of E-glass hydrolyzed by HCl solution could be restored by immersion in NaOH. Evidence is presented to show that phase separation occurs in E-glass filaments, with the approximate dimensions of 100A. A tentative theory is advanced to explain the mechanism of stress corrosion. (Author)

Document Details

Document Type
Technical Report
Publication Date
Jun 01, 1968
Accession Number
AD0837405

Entities

People

  • A. G. Metcalfe
  • G. K. Schmitz
  • M. E. Gulden

Tags

DTIC Thesaurus Topics

  • Chemical Analysis
  • Chemical Reactions
  • Corrosion
  • Electron Microscopy
  • Exchange Reactions
  • Fatigue Tests (Mechanics)
  • Filaments
  • Glass Fibers
  • Ion Exchange
  • Materials
  • Microscopy
  • Phase Separation
  • Stress Corrosion
  • Transmission Electron Microscopy
  • Water Vapor

Fields of Study

  • Materials science

Readers

  • Analytical Chemistry
  • Materials Science and Engineering.
  • Reinforced Composite Materials

Technology Areas

  • Microelectronics
  • Microelectronics - Graphene