NDLI: Low-dimensional intrinsic material functions for nonlinear viscoelasticity

Content Provider	Springer Nature Link
Author	Ewoldt, Randy H. Bharadwaj, N. Ashwin
Copyright Year	2013
Abstract	Rheological material functions are used to form our conceptual understanding of a material response. For a nonlinear rheological response, the possible deformation protocols and material measures span a high-dimensional space. Here, we use asymptotic expansions to outline low-dimensional measures for describing leading-order nonlinear responses in large amplitude oscillatory shear (LAOS). This amplitude-intrinsic regime is sometimes called medium amplitude oscillatory shear (MAOS). These intrinsic nonlinear material functions are only a function of oscillatory frequency, and not amplitude. Such measures have been suggested in the past, but here, we clarify what measures exist and give physically meaningful interpretations. Both shear strain control (LAOStrain) and shear stress control (LAOStress) protocols are considered, and nomenclature is introduced to encode the physical interpretations. We report the first experimental measurement of all four intrinsic shear nonlinearities of LAOStrain. For the polymeric hydrogel (polyvinyl alcohol - Borax) we observe typical integer power function asymptotics. The magnitudes and signs of the intrinsic nonlinear fingerprints are used to conceptually model the mechanical response and to infer molecular and microscale features of the material.
Starting Page	201
Ending Page	219
Page Count	19
File Format	PDF
ISSN	00354511
Journal	Rheologica Acta
Volume Number	52
Issue Number	3
e-ISSN	14351528
Language	English
Publisher	Springer-Verlag
Publisher Date	2013-03-27
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Large amplitude oscillatory shear Nonlinear viscoelasticity Material functions Rheometer Transient polymer network Polyvinyl alcohol Characterization and Evaluation of Materials Polymer Sciences Soft and Granular Matter, Complex Fluids and Microfluidics Mechanical Engineering Food Science
Content Type	Text
Resource Type	Article
Subject	Mechanics of Materials Condensed Matter Physics Materials Science

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