Experimental Mechanics

, Volume 47, Issue 2, pp 237–249 | Cite as

Cure-dependent Viscoelastic Poisson’s Ratio of Epoxy

  • D. J. O’Brien
  • N. R. Sottos
  • S. R. White


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.


Viscoelasticity Poisson’s ratio Cure-dependence Moiré interferometry 


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Copyright information

© Society for Experimental Mechanics 2007

Authors and Affiliations

  • D. J. O’Brien
    • 1
    • 2
  • N. R. Sottos
    • 3
  • S. R. White
    • 4
  1. 1.Department of Mechanical and Industrial EngineeringUniversity of Illinois at Urbana-ChampaignUrbanaUSA
  2. 2.Weapons and Materials Research DirectorateUS Army Research LaboratoryAberdeenUSA
  3. 3.Department of Materials Science and EngineeringUniversity of Illinois at Urbana-ChampaignUrbanaUSA
  4. 4.Department of Aerospace EngineeringUniversity of Illinois at Urbana-ChampaignUrbanaUSA

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