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Non-Newtonian Flow to the Theoretical Strength of Glasses via Impact Nanoindentation at Room Temperature
Rhein Westfal TH Aachen, Germany.
Rhein Westfal TH Aachen, Germany.
Rhein Westfal TH Aachen, Germany.
Linnaeus University, Faculty of Technology, Department of Built Environment and Energy Technology. Natl Hellen Res Fdn, Greece.
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2017 (English)In: Scientific Reports, ISSN 2045-2322, E-ISSN 2045-2322, Vol. 7, article id 17618Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
Nature Publishing Group, 2017. Vol. 7, article id 17618
National Category
Materials Engineering
Research subject
Technology (byts ev till Engineering), Glass Technology
Identifiers
URN: urn:nbn:se:lnu:diva-69766DOI: 10.1038/s41598-017-17871-4ISI: 000418250800003PubMedID: 29247213OAI: oai:DiVA.org:lnu-69766DiVA, id: diva2:1173514
Available from: 2018-01-12 Created: 2018-01-12 Last updated: 2018-01-31Bibliographically approved

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Möncke, Doris

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