Εξειδίκευση τύπου :	Άρθρο σε επιστημονικό περιοδικό
Τίτλος:	Non-Newtonian Flow to the Theoretical Strength of Glasses via Impact Nanoindentation at Room Temperature
Δημιουργός/Συγγραφέας:	Zehnder C. Peltzer J.-N. Gibson J.S.K.-L. Möncke D. Korte-Kerzel S.
Εκδότης:	Nature Publishing Group
Ημερομηνία:	2017
Γλώσσα:	Αγγλικά
ISSN:	2045-2322
DOI:	10.1038/s41598-017-17871-4
Άλλο:	PubMed ID: 29247213
Περίληψη:	In many daily applications glasses are indispensable and novel applications demanding improved strength and crack resistance are appearing continuously. Up to now, the fundamental mechanical processes in glasses subjected to high strain rates at room temperature are largely unknown and thus guidelines for one of the major failure conditions of glass components are non-existent. Here, we elucidate this important regime for the first time using glasses ranging from a dense metallic glass to open fused silica by impact as well as quasi-static nanoindentation. We show that towards high strain rates, shear deformation becomes the dominant mechanism in all glasses accompanied by Non-Newtonian behaviour evident in a drop of viscosity with increasing rate covering eight orders of magnitude. All glasses converge to the same limit stress determined by the theoretical hardness, thus giving the first experimental and quantitative evidence that Non-Newtonian shear flow occurs at the theoretical strength at room temperature.
Τίτλος πηγής δημοσίευσης:	Scientific Reports
Τόμος/Κεφάλαιο:	7
Τεύχος:	1
Θεματική Κατηγορία:	[EL] Φυσική και θεωρητική χημεία[EN] Physical and theoretical chemistry
Αξιολόγηση από ομότιμους (peer reviewed):	Ναι
Κάτοχος πνευματικών δικαιωμάτων:	© 2017 The Author(s).
Όροι και προϋποθέσεις δικαιωμάτων:	Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.
Σημειώσεις:	Deutsche Forschungsgemeinschaft, DFG: KO4603/1-1
Εμφανίζεται στις συλλογές:	Ινστιτούτο Θεωρητικής και Φυσικής Χημείας (ΙΘΦΧ) - Επιστημονικό έργο