Failure Analysis for Polycarbonate Transparencies,

Abstract

An attempt was made to develop diagnostic, preventive, and predictive methods for the analysis of Polycarbonate fracture based on the model of critical free volume leading to a brittle ductile transition. Since it has been shown that polycarbonate can be rejuvenated by heating above its glass transition temperature to regenerate the necessary excess free volume, brittle failures can be averted in transparencies that are close to the ductile-brittle transition. A master curve of free volume versus aging time, normalized for stress level and temperature was to be developed. However, due to opposing forces developed under temperature and stress the net results could not be distinguished sufficiently from the number of data points collected to develop a master curve. Information regarding the test procedures and quantitative analysis on the effects of the individual forces are included.

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Document Details

Document Type
Technical Report
Publication Date
Sep 01, 1994
Accession Number
ADA317196

Entities

People

  • Gideon Salee
  • Kenneth Heater
  • S. K. Taylor

Organizations

  • Battelle Memorial Institute

Tags

Communities of Interest

  • Energy and Power Technologies
  • Space

DTIC Thesaurus Topics

  • Amorphous Materials
  • Data Analysis
  • Ductile Brittle Transition
  • Failure Mode And Effect Analysis
  • Glass
  • Glass Transition Temperature
  • Materials
  • Materials Engineering
  • Materials Science
  • Mechanical Properties
  • Physical Properties
  • Positrons
  • Stresses
  • Tensile Properties
  • Thermodynamic Properties
  • Transition Temperature
  • Transitions

Readers

  • Computational Modeling and Simulation
  • Materials Science (Mechanical Engineering).
  • Polymer Science and Engineering.