Mauro, J. C.

Smedskjær, Morten Mattrup

Yue, Yuanzheng

English

    Aalborg UniversitetUnderstanding Glass Hardness from Constraint TheoryAn invited talkSmedskjær, Morten Mattrup; Mauro, J. C.; Yue, YuanzhengPublication date:2011Document VersionAccepted author manuscript, peer reviewed versionLink to publication from Aalborg UniversityCitation for published version (APA):Smedskjær, M. M., Mauro, J. C., & Yue, Y. (2011). Understanding Glass Hardness from Constraint Theory: Aninvited talk. Abstract from 2011 GOMD Annual Meeting of the American Ceramic Society, Savannah, UnitedStates.General rightsCopyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright ownersand it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights.            ? Users may download and print one copy of any publication from the public portal for the purpose of private study or research.            ? You may not further distribute the material or use it for any profit-making activity or commercial gain            ? You may freely distribute the URL identifying the publication in the public portal ?Take down policyIf you believe that this document breaches copyright please contact us at vbn@aub.aau.dk providing details, and we will remove access tothe work immediately and investigate your claim.Downloaded from vbn.aau.dk on: November 29, 2020American Ceramic Society, GOMD Annual Meeting, Savannah, USA, May 15-19, 2011     Understanding Glass Hardness from Constraint Theory  Morten M. Smedskjaer,a,b,* John C. Mauro,b and Yuanzheng Yuea  a Section of Chemistry, Aalborg University, DK-9000 Aalborg, Denmark b Science and Technology Division, Corning Incorporated, Corning, NY 14831, USA  * Corresponding author. Tel.: +45 99407240. E-mail address: m.smedskjaer@gmail.com   Understanding the composition dependence of glass properties is of critical importance for the quantitative design of new glassy materials. Hardness is an important mechanical property of glasses, but a theoretical prediction of glass hardness has hitherto been impossible. In this work, we present a topological approach for quantitative prediction of hardness of inorganic glasses, taking the ternary soda-lime-borate glassy system as an example. We show that hardness is governed by the number of network constraints at room temperature and that a critical number of constraints is required for a material to display mechanical resistance. By comparison of the hardness prediction with that of the glass transition temperature, we demonstrate the importance of accounting for the temperature dependence of the network constraints. The predicted values of hardness are in excellent agreement with experimental data, and we are also able to account quantitatively for changes in hardness that occur when the surface composition changes.  Keywords: topological constraint model; hardness; network topology; borate glasses 

Understanding Glass Hardness from Constraint Theory:An invited talk

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Understanding Glass Hardness from Constraint Theory:An invited talk

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