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

Bruns, Sebastian ; Petho, Laszlo ; Minnert, Christian ; Michler, Johann ; Durst, Karsten (2019)
Fracture toughness determination of fused silica by cube corner indentation cracking and pillar splitting.
In: Materials & Design, 2019, 186
doi: 10.25534/tuprints-00009686
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Item Type: Article
Type of entry: Secondary publication
Title: Fracture toughness determination of fused silica by cube corner indentation cracking and pillar splitting
Language: English
Date: 12 December 2019
Place of Publication: Darmstadt
Year of primary publication: 2019
Publisher: Elsevier
Journal or Publication Title: Materials & Design
Volume of the journal: 186
Collation: 8 Seiten
DOI: 10.25534/tuprints-00009686
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Origin: Secondary publication via sponsored Golden Open Access
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.

Status: Publisher's Version
URN: urn:nbn:de:tuda-tuprints-96866
Classification DDC: 600 Technology, medicine, applied sciences > 600 Technology
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Physical Metallurgy
Date Deposited: 12 Dec 2019 07:23
Last Modified: 20 Oct 2023 11:17
URI: https://tuprints.ulb.tu-darmstadt.de/id/eprint/9686
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