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Cure-dependent Viscoelastic Poisson’s Ratio of Epoxy

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Abstract

The evolution of the lateral contraction ratio of two commercial (high and low temperature cure) epoxy resins is studied in uniaxial tension using moiré 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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Author notes

  1. D. J. O’Brien

    Present address: Weapons and Materials Research Directorate, US Army Research Laboratory, Aberdeen Proving Ground, Aberdeen, MD, 21005, USA

Authors and Affiliations

  1. Department of Mechanical and Industrial Engineering, University of Illinois at Urbana-Champaign, Urbana, IL, 61801, USA

    D. J. O’Brien

  2. Department of Materials Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, IL, 61801, USA

    N. R. Sottos (SEM member)

  3. Department of Aerospace Engineering, University of Illinois at Urbana-Champaign, Urbana, IL, 61801, USA

    S. R. White (SEM member)

Authors
  1. D. J. O’Brien
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  2. N. R. Sottos
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  3. S. R. White
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Correspondence to D. J. O’Brien.

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O’Brien, D.J., Sottos, N.R. & White, S.R. Cure-dependent Viscoelastic Poisson’s Ratio of Epoxy. Exp Mech 47, 237–249 (2007). https://doi.org/10.1007/s11340-006-9013-9

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  • DOI: https://doi.org/10.1007/s11340-006-9013-9

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