EFFECTS OF TEMPERATURE, STRAIN RATE, AND SWELLING ON THE STRESS-STRAIN PROPERTIES OF ETHYLENE-PROPYLENE GUM VULCANIZATES OF VARYING CROSSLINK DENSITY

Abstract

The stress-strain properties and ultimate properties of EPR vulcanizates of varying cross-link density (swollen and un-swollen) were determined at two temperatures and two strain rates. A swell-deswell technique was employed to obtain equilibrium results at low volume fraction of rubber. The Mooney-Rivlin constants were found to depend on temperature, strain rate, and crosslink density. The network structural parameters obtained from swollen stress-strain curves were always greater than values obtained from the Mooney- Rivlin constants. Thermo elastic measurements showed that EPR undergoes a larger negative internal energy change on extension due to rotational energy levels within chains than polyethyene. A plot of the ultimate properties described a curve which was nearly independent of test conditions. The EPR curve was shifted in the direction of higher elongations.

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Document Details

Document Type
Technical Report
Publication Date
Aug 12, 1963
Accession Number
AD0414845

Entities

People

  • T. J. Dudek

Organizations

  • The Aerospace Corporation

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Air Force
  • Alkenes
  • Biomedical And Dental Materials
  • Elastomers
  • Elongation
  • Energy Levels
  • High Temperature
  • Hysteresis
  • Materials
  • Materials Science
  • Measurement
  • Polymers
  • Strain Rate
  • Stress Strain Relations
  • Stresses
  • Tensile Strength
  • Vulcanizates

Fields of Study

  • Materials science

Readers

  • Mechanical Engineering/Mechanics of Materials.
  • Polymer Science and Engineering.