LAOS: The strain softening/strain hardening paradox
| Autor: | Nicolas Martzel, Daniel Bonn, M. R. B. Mermet-Guyennet, Mehdi Habibi, Morton M. Denn, J. Gianfelice de Castro |
|---|---|
| Přispěvatelé: | Université d'Artois (UA), Institut de Chimie de Clermont-Ferrand (ICCF), SIGMA Clermont (SIGMA Clermont)-Institut de Chimie du CNRS (INC)-Université Clermont Auvergne [2017-2020] (UCA [2017-2020])-Centre National de la Recherche Scientifique (CNRS), Société Michelin, Univ British Columbia, Dept Phys & Astron, Vancouver, BC V6T 1Z1, Canada, Canadian Institute for Advanced Research (CIFAR), Soft Matter (WZI, IoP, FNWI) |
| Jazyk: | angličtina |
| Rok vydání: | 2015 |
| Předmět: |
[PHYS]Physics [physics]
Materials science Strain (chemistry) Mechanical Engineering Work hardening Strain hardening exponent Condensed Matter Physics Stress (mechanics) Condensed Matter::Materials Science Mechanics of Materials Tangent modulus Life Science General Materials Science Deformation (engineering) Composite material Softening Elastic modulus [PHYS.COND.CM-SCM]Physics [physics]/Condensed Matter [cond-mat]/Soft Condensed Matter [cond-mat.soft] |
| Zdroj: | Journal of Rheology 59 (2015) 1 Journal of Rheology Journal of Rheology, 2015, 59 (1), pp.21-32. ⟨10.1122/1.4902000⟩ Journal of Rheology, 59(1), 21-32. Society of Rheology Journal of Rheology, 59(1), 21-32 |
| ISSN: | 1520-8516 0148-6055 |
| Popis: | International audience; Numerous materials, from biopolymers to filled rubbers, exhibit strain softening at high strain amplitudes during a strain sweep in oscillatory rheology: The modulus decreases with increasing deformation. On the other hand, if the nonlinear elastic response is analyzed within a single oscillation cycle (described by a Lissajous curve), these systems are often reported to exhibit strain hardening. We compare strain sweeps and single cycle LAOS (large amplitude oscillatory shear) analyses of stress vs strain on three very different materials. We conclude that the reported strain hardening is due to the use of a tangent modulus in the LAOS analysis, and that the overall rheology remains strain softening. To show that this conclusion is robust, we demonstrate a rescaling of the modulus that collapses the data from all the oscillatory measurements onto a single master curve that clearly exhibits the correct strain softening behavior. |
| Databáze: | OpenAIRE |
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