Berlin 2018 – scientific programme
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MM: Fachverband Metall- und Materialphysik
MM 27: Poster Session I
MM 27.22: Poster
Tuesday, March 13, 2018, 18:30–19:45, Poster E
Mechanical properties of deformed and undeformed model glass former — •Mehrdad Golkia1, Gaurav Shrivastav2, and Jürgen Horbach1 — 1Institut für Theoretische Physik II: Weiche Materie, Heinrich-Heine-Universität Düsseldorf, Germany — 2Institut für Theoretische Physik, Sekr. EW 71, Technische Universität Berlin, Germany
The mechanical properties of glasses depend strongly on the history of their production. New glass states can be obtained by melting a glass via an external shear field, followed by a stress relaxation after switching off the shear. Since the imposed shear stress cannot completely relax to zero below the glass transition temperature, one eventually obtains a deformed glass with residual stresses [1],[2]. Here, we compare the elastic properties of deformed glasses to those of undeformed ones, using molecular dynamics computer simulations of a Kob-Andersen Lennard-Jones mixture [3]. The elastic constants of deformed and undeformed glass samples are obtained from the analysis of stress fluctuations. While the bulk modulus and the Poisson ratio are not affected by the shear deformation, slight differences can be seen in the shear modulus as well as Young’s modulus. We also compare deformed and undeformed glasses in terms of the vibrational density of states and the boson peak.
References: [1] M. Ballauff et al., Phys. Rev. Lett. 110, 215701 (2013) [2] I. Binkowski, G. P. Shrivastav, J. Horbach, S. V. Divinski, and G. Wilde, Acta Mater. 109, 330 (2016) [3] W. Kob and H. C. Andersen, Phys. Rev. Lett. 73, 1376 (1994)