Εξειδίκευση τύπου :	Άρθρο σε επιστημονικό περιοδικό
Τίτλος:	Influence of cooling rate on cracking and plastic deformation during impact and indentation of borosilicate glasses
Δημιουργός/Συγγραφέας:	Zehnder C. Bruns S. Peltzer J.-N. Durst K. Korte-Kerzel S. Möncke D.
Εκδότης:	Frontiers Media S.A.
Ημερομηνία:	2017
Γλώσσα:	Αγγλικά
ISSN:	2296-8016
DOI:	10.3389/fmats.2017.00005
Περίληψη:	The influence of a changing glass topology on local mechanical properties was studied in a multitechnique nanomechanical approach. The glass response against sharp contacts can result in structural densification, plastic flow, or crack initiation. By using instrumented indentation testing, the mechanical response was studied in different strain rate regimes for a sodium borosilicate glass (NBS) exhibiting altering structures due to varying processing conditions. Comparison with data from former studies and with literature data on other glass structures helped to elucidate the role of the borate and silicate subnetworks and to understand the overall mechanical properties of the mixed glass systems. A peculiarity of some of the NBS glasses tested in this study is the fact that the connectivity of the borate and silicate entities depends on the sample’s thermal history. Although the influence on macroscopic material properties such as E and H is minor, the onset of cracking indeed is influenced by those structural changes within the glass. Rapidly quenched glass shows an improved crack resistance, which is even more pronounced at high strain rates. Studies on various processing conditions further indicate that this transition is closely related to the cooling rate around Tg. The strain rate dependence of cracking is discussed in terms of the occurrence of shear deformation and densification.
Τίτλος πηγής δημοσίευσης:	Frontiers in Materials
Τόμος/Κεφάλαιο:	4
Θεματική Κατηγορία:	[EL] Φυσική και θεωρητική χημεία[EN] Physical and theoretical chemistry
Λέξεις-Κλειδιά:	Activation volume Borosilicate glasses Deformation mechanism Impact Indentation Interconnectivity Strain rate sensitivity
Αξιολόγηση από ομότιμους (peer reviewed):	Ναι
Κάτοχος πνευματικών δικαιωμάτων:	© 2017 Zehnder, Bruns, Peltzer, Durst, Korte-Kerzel and Möncke.
Όροι και προϋποθέσεις δικαιωμάτων:	All Open Access, Gold, Green
Σημειώσεις:	The authors are grateful for financial support from the German Science Foundation through its priority program SPP 1594 and the German-Greek program IKYDA 2015 for the promotion of exchange and scientific cooperation between Greece and Germany.
Εμφανίζεται στις συλλογές:	Ινστιτούτο Θεωρητικής και Φυσικής Χημείας (ΙΘΦΧ) - Επιστημονικό έργο