Nonlinear viscoelasticity of fat crystal networks

Braulio A. Macias-Rodriguez, Randy H Ewoldt, Alejandro G. Marangoni

Research output: Contribution to journalArticle

Abstract

The rheology of fat crystal networks under linear shear deformations has been extensively studied due to its role in material functionality and sensory perceptions. In contrast, there has been limited focus on their viscoelastic response under large shear deformations imposed during processing and product use. We probed the nonlinear viscoelastic behavior of fats displaying mechanics akin to ductile and brittle solids using large amplitude oscillatory shear (LAOS). Using the FT-Chebyshev stress decomposition method, and local measures of nonlinear viscoelasticity, we obtained rheological properties relevant to bulk behavior. We found that ductile fats dissipate more viscous energy than brittle fats and show increased plastic deformation. Structural characterization revealed the presence of three hierarchy levels and layered microstructures in ductile fats in contrast to only two hierarchies and random microstructures in brittle fats. We suggest that these structural features account for increased hypothesize dissipation, which contributes to their ductile-like macroscopic behavior.

Original languageEnglish (US)
Pages (from-to)251-266
Number of pages16
JournalRheologica Acta
Volume57
Issue number3
DOIs
StatePublished - Mar 1 2018

Fingerprint

viscoelasticity
Viscoelasticity
fats
Oils and fats
Fats
Crystals
crystals
shear
Shear deformation
hierarchies
microstructure
Microstructure
Rheology
rheology
plastic deformation
Plastic deformation
Mechanics
dissipation
Decomposition
decomposition

Keywords

  • Brittle
  • Ductile
  • Fat
  • Nonlinear
  • Rheology

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

Cite this

Nonlinear viscoelasticity of fat crystal networks. / Macias-Rodriguez, Braulio A.; Ewoldt, Randy H; Marangoni, Alejandro G.

In: Rheologica Acta, Vol. 57, No. 3, 01.03.2018, p. 251-266.

Research output: Contribution to journalArticle

Macias-Rodriguez, BA, Ewoldt, RH & Marangoni, AG 2018, 'Nonlinear viscoelasticity of fat crystal networks', Rheologica Acta, vol. 57, no. 3, pp. 251-266. https://doi.org/10.1007/s00397-018-1072-1
Macias-Rodriguez, Braulio A. ; Ewoldt, Randy H ; Marangoni, Alejandro G. / Nonlinear viscoelasticity of fat crystal networks. In: Rheologica Acta. 2018 ; Vol. 57, No. 3. pp. 251-266.
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