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Fracture toughness determination of fused silica by cube corner indentation cracking and pillar splitting

Bruns, Sebastian and Petho, Laszlo and Minnert, Christian and Michler, Johann and Durst, Karsten (2020):
Fracture toughness determination of fused silica by cube corner indentation cracking and pillar splitting.
In: Materials & Design, 186. Elsevier, ISSN 02641275,
DOI: 10.25534/tuprints-00011386,
[Online-Edition: https://doi.org/10.1016/j.matdes.2019.108311],
Secondary publishing via sponsored Golden Open Access, [Article]

Abstract

In this paper the applicability of the pillar splitting technique for fracture toughness determination on anomalous behaving bulk fused silica glass is explored. The results are compared to conventional cube corner indentation cracking analyzed using the Lawn, Evans and Marshall model (JACerS, 63 (1980) 574). The experimental analysis is supported by constitutive Finite Element Analysis with cohesive zones to determine adequate gauge factors to correlate the load instability upon splitting to the fracture toughness Kc. The role of densification on pillar splitting was critically examined. The results show a fragmentation of the micro pillar into three parts, a failure pattern as proposed by Sebastiani et al. (Philos. Mag., 95 (2014) 1928). Therefore, the applicability of pillar splitting to (anomalous) glasses is confirmed. Cohesive zone FEA delivered the gauge factors required for fracture toughness calculation. The influence of densification on those factors, however, was found to be small for indentation cracking and negligible for pillar splitting. With the corresponding set of gauge factors fracture toughness values in good accordance with literature could be determined. Inside the SEM, moreover, electron beam irradiation has been found to enhance the fracture properties of fused silica.

Item Type: Article
Erschienen: 2020
Creators: Bruns, Sebastian and Petho, Laszlo and Minnert, Christian and Michler, Johann and Durst, Karsten
Title: Fracture toughness determination of fused silica by cube corner indentation cracking and pillar splitting
Language: English
Abstract:

In this paper the applicability of the pillar splitting technique for fracture toughness determination on anomalous behaving bulk fused silica glass is explored. The results are compared to conventional cube corner indentation cracking analyzed using the Lawn, Evans and Marshall model (JACerS, 63 (1980) 574). The experimental analysis is supported by constitutive Finite Element Analysis with cohesive zones to determine adequate gauge factors to correlate the load instability upon splitting to the fracture toughness Kc. The role of densification on pillar splitting was critically examined. The results show a fragmentation of the micro pillar into three parts, a failure pattern as proposed by Sebastiani et al. (Philos. Mag., 95 (2014) 1928). Therefore, the applicability of pillar splitting to (anomalous) glasses is confirmed. Cohesive zone FEA delivered the gauge factors required for fracture toughness calculation. The influence of densification on those factors, however, was found to be small for indentation cracking and negligible for pillar splitting. With the corresponding set of gauge factors fracture toughness values in good accordance with literature could be determined. Inside the SEM, moreover, electron beam irradiation has been found to enhance the fracture properties of fused silica.

Journal or Publication Title: Materials & Design
Publisher: Elsevier
Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Physical Metallurgy
Date Deposited: 26 Jan 2020 20:58
DOI: 10.25534/tuprints-00011386
Official URL: https://doi.org/10.1016/j.matdes.2019.108311
URN: urn:nbn:de:tuda-tuprints-113866
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