Cure-dependent Viscoelastic Poisson's Ratio of Epoxy

Abstract

The evolution of the lateral contraction ratio of two commercial (high and low temperature cure) epoxy resins is studied in uniaxial tension using moire' interferometry. The ratio of transverse to axial strains evolves from an elastic value of about 0.40 to a rubbery plateau value of 0.49 at long times. Furthermore, the data indicate that the contraction ratio follows time-temperature superposition with a shift function indistinguishable from other axial viscoelastic functions. The lateral contraction behavior at several cure states past gelation was measured and a model is proposed to describe the cure dependence.

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Document Details

Document Type
Technical Report
Publication Date
Jan 26, 2007
Accession Number
ADA602025

Entities

People

  • D. J. O'brien
  • N. R. Sottos
  • S. R. White

Organizations

  • University of Illinois Urbana–Champaign

Tags

Communities of Interest

  • Biomedical
  • Weapons Technologies

DTIC Thesaurus Topics

  • Engineering
  • Epoxy Resins
  • Equations
  • Gelation
  • High Temperature
  • Image Processing
  • Interferometers
  • Interferometry
  • Low Temperature
  • Materials
  • Materials Science
  • Measurement
  • Mechanics
  • Polymers
  • Resins
  • Transverse
  • Two Dimensional

Readers

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