Bruns, Sebastian (2020)
The Indentation Densification and Cracking Behavior of Fused Silica.
Technische Universität Darmstadt
doi: 10.25534/tuprints-00011778
Dissertation, Erstveröffentlichung
Kurzbeschreibung (Abstract)
The damage resistance of glass is of great scientific and economic interest. In oxide glasses crack formation is closely related to the plastic deformation processes that occur under contact stress, i.e. shear flow or structural compression. In this context an increased crack resistance is often attributed to an increased compaction capacity. However, the influence of densification on crack initiation and expansion remains unclear.
In the present work the influence of densification on cracking is investigated using both cohesive zone finite element modelling and nanoindentation testing with fused silica serving as model system for densifying oxide glass. The densification information from hydrostatic compaction experiments was implemented into the FEA using modified Drucker-Prager cap plasticity. Nanoindentation experiments with various tip geometries and Raman spectroscopy were used to quantify densification and cracking experimentally. The fracture toughness of fused silica was assessed by indentation cracking and micro pillar splitting techniques, finding values in good accordance with literature.
Typ des Eintrags: | Dissertation | ||||
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Erschienen: | 2020 | ||||
Autor(en): | Bruns, Sebastian | ||||
Art des Eintrags: | Erstveröffentlichung | ||||
Titel: | The Indentation Densification and Cracking Behavior of Fused Silica | ||||
Sprache: | Englisch | ||||
Referenten: | Durst, Prof. Dr. Karsten ; de Ligny, Prof. Dr. Dominique | ||||
Publikationsjahr: | Mai 2020 | ||||
Ort: | Darmstadt | ||||
Datum der mündlichen Prüfung: | 23 April 2020 | ||||
DOI: | 10.25534/tuprints-00011778 | ||||
URL / URN: | https://tuprints.ulb.tu-darmstadt.de/11778 | ||||
Kurzbeschreibung (Abstract): | The damage resistance of glass is of great scientific and economic interest. In oxide glasses crack formation is closely related to the plastic deformation processes that occur under contact stress, i.e. shear flow or structural compression. In this context an increased crack resistance is often attributed to an increased compaction capacity. However, the influence of densification on crack initiation and expansion remains unclear. In the present work the influence of densification on cracking is investigated using both cohesive zone finite element modelling and nanoindentation testing with fused silica serving as model system for densifying oxide glass. The densification information from hydrostatic compaction experiments was implemented into the FEA using modified Drucker-Prager cap plasticity. Nanoindentation experiments with various tip geometries and Raman spectroscopy were used to quantify densification and cracking experimentally. The fracture toughness of fused silica was assessed by indentation cracking and micro pillar splitting techniques, finding values in good accordance with literature. |
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URN: | urn:nbn:de:tuda-tuprints-117784 | ||||
Sachgruppe der Dewey Dezimalklassifikatin (DDC): | 500 Naturwissenschaften und Mathematik > 500 Naturwissenschaften 600 Technik, Medizin, angewandte Wissenschaften > 620 Ingenieurwissenschaften und Maschinenbau |
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Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Physikalische Metallkunde |
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Hinterlegungsdatum: | 18 Jun 2020 09:22 | ||||
Letzte Änderung: | 23 Jun 2020 05:15 | ||||
PPN: | |||||
Referenten: | Durst, Prof. Dr. Karsten ; de Ligny, Prof. Dr. Dominique | ||||
Datum der mündlichen Prüfung / Verteidigung / mdl. Prüfung: | 23 April 2020 | ||||
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