Overshoots in stress-strain curves : Colloid experiments and schematic mode coupling theory

Amann, Christian P.; Weysser, Fabian; Fuchs, Matthias; Siebenbürger, Miriam; Ballauff, Matthias; Krüger, Matthias

Overshoots in stress-strain curves : Colloid experiments and schematic mode coupling theory

Dateien

Amann_213394.pdfGröße: 679.34 KBDownloads: 306

Datum

2013

Autor:innen

Amann, Christian P.

Weysser, Fabian

Fuchs, Matthias

Siebenbürger, Miriam

Ballauff, Matthias

Krüger, Matthias

Projekt

Nonlinear mechanical response of supercooled melts under applied stress, FOR 1394, P3

Open Access-Veröffentlichung

Open Access Green

Sammlungen

Physik

Publikationstyp

Zeitschriftenartikel

Publikationsstatus

Published

Erschienen in

Journal of Rheology. 2013, 57(1), pp. 149-175. ISSN 0148-6055. eISSN 1520-8516. Available under: doi: 10.1122/1.4764000

Zusammenfassung

The stress vs strain curves in dense colloidal dispersions under start-up shear flow are investigated combining experiments on model core-shell microgels, computer simulations of hard disk mixtures, and mode coupling theory. In dense fluid and glassy states, the transient stresses exhibit first a linear increase with the accumulated strain, then a maximum (stress overshoot) for strain values around 5%, before finally approaching the stationary value, which makes up the flow curve. These phenomena arise in well-equilibrated systems and for homogeneous flows, indicating that they are generic phenomena of the shear-driven transient structural relaxation. Microscopic mode coupling theory (generalized to flowing states by integration through the transients) derives them from the transient stress correlations, which first exhibit a plateau (corresponding to the solid-like elastic shear modulus) at intermediate times, and then negative stress correlations during the final decay. We introduce and validate a schematic model within mode coupling theory which captures all of these phenomena and handily can be used to jointly analyze linear and large-amplitude moduli, flow curves, and stress-strain curves. This is done by introducing a new strain- and time-dependent vertex into the relation between the generalized shear modulus and the transient density correlator.

Fachgebiet (DDC)

530 Physik

Schlagwörter

colloids, gels, shear flow, shear modulus, stress-strain relations, Colloids, Nonlinear rheology, Glass transition

Zitieren

ISO 690

AMANN, Christian P., Fabian WEYSSER, Matthias FUCHS, Miriam SIEBENBÜRGER, Matthias BALLAUFF, Matthias KRÜGER, 2013. Overshoots in stress-strain curves : Colloid experiments and schematic mode coupling theory. In: Journal of Rheology. 2013, 57(1), pp. 149-175. ISSN 0148-6055. eISSN 1520-8516. Available under: doi: 10.1122/1.4764000

BibTex

@article{Amann2013Overs-21339,
  year={2013},
  doi={10.1122/1.4764000},
  title={Overshoots in stress-strain curves : Colloid experiments and schematic mode coupling theory},
  number={1},
  volume={57},
  issn={0148-6055},
  journal={Journal of Rheology},
  pages={149--175},
  author={Amann, Christian P. and Weysser, Fabian and Fuchs, Matthias and Siebenbürger, Miriam and Ballauff, Matthias and Krüger, Matthias}
}

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Universitätsbibliographie

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