THE EFFECT OF TEMPERATURE ON THE DELAYED YIELD AND FAILURE OF 'PLASTICIZED' EPOXY RESIN

Abstract

Epoxy-versamid specimens were loaded in tension up to failure at different constant strain-rates and temperatures. Results revealed three modes of behavior prevailing at different temperature-strain-rate regions and associated with brittle, ductile and rubbery failure modes. The ductile region was found to be confined within a narrow band on the temperature-strain-rate plane, and is characterized by a yield plateau in the stress-strain curve and by linear dependence of yield stress on log strain rate and temperature. Yield strain seems to be almost unaffected by strain-rate, but decreases slightly with temperature rise. Analysis indicated that experimental data within the ductile region are consistent with Eyring's formulation for non-Newtonian viscoplastic flow. It leads to the evaluation of the 'apparent activation energy' and activation volume for the two epoxy systems tested. Comparison with previous work indicates that the above parameters as well as yield stress and elastic modulus tend to increase with the decrease of versamid content in the resin.

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Document Details

Document Type
Technical Report
Publication Date
Sep 01, 1968
Accession Number
AD0841951

Entities

People

  • O. Ishai

Organizations

  • Monsanto

Tags

Communities of Interest

  • Air Platforms
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Composite Materials
  • Contracts
  • Department Of Defense
  • Epoxy Resins
  • Failure Mode And Effect Analysis
  • Heat Of Activation
  • Materials
  • Mechanical Properties
  • Mechanical Working
  • Military Research
  • Modulus Of Elasticity
  • Polymers
  • Resins
  • Strain Rate
  • Stress Strain Relations
  • Stresses
  • Three Dimensional

Fields of Study

  • Materials science

Readers

  • Mechanical Engineering/Mechanics of Materials.