Time and Humidity Dependence of Indentation Cracking in Aluminosilicate Glasses

Tobias Kjær Bechgaard, John C. Mauro, Morten Mattrup Smedskjær

Research output: Contribution to conference without publisher/journalPosterResearchpeer-review

7 Citations (Scopus)
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Abstract

The inherent brittleness and poor crack resistance of oxide glasses have always been among their main limitations for many advanced applications. As the formation of cracks leads to amplification of applied tensile stresses and ultimately catastrophic failure, there is an interest in understanding the compositional and structural dependence of crack initiation and growth. The resistance to cracking can conventionally be measured using instrumented indentation that mimics the real-life damage for certain applications. Wada introduced a method to evaluate the crack resistance by counting the number of initiated cracks as a function of the applied load. Experiments have shown that the environmental humidity and the time period between indentation and crack counting both affect the crack resistance value, but unfortunately these parameters are not always reported in literature studies. Here we perform a systematic study of the time and humidity dependence of crack initiation in calcium aluminosilicate glasses. Depending on the experimental conditions (time and humidity), the crack resistance of an aluminosilicate glass can vary by more than a factor of two. Furthermore, the observed radial/median cracks can initiate several hours after indentation. These results therefore indicate the need for a standardized procedure for determination of crack resistance to allow comparison of data from different research groups. We suggest including a sufficiently long waiting period (such as 24 h) between indentation and crack counting, as the majority of the crack initiation will then have occurred.

Original languageEnglish
Publication date20 May 2018
DOIs
Publication statusPublished - 20 May 2018
Event2018 Glass and Optical Materials Division Annual Meeting - Hilton Palacio del Rio, San Antonio, United States
Duration: 20 May 201824 May 2018
http://ceramics.org/gomd2018

Conference

Conference2018 Glass and Optical Materials Division Annual Meeting
LocationHilton Palacio del Rio
CountryUnited States
CitySan Antonio
Period20/05/201824/05/2018
Internet address

Fingerprint

indentation
time dependence
humidity
cracks
glass
crack initiation
counting
brittleness
tensile stress
calcium
damage
oxides

Cite this

Bechgaard, T. K., Mauro, J. C., & Smedskjær, M. M. (2018). Time and Humidity Dependence of Indentation Cracking in Aluminosilicate Glasses. Poster presented at 2018 Glass and Optical Materials Division Annual Meeting, San Antonio, United States. https://doi.org/10.1016/j.jnoncrysol.2018.04.009
Bechgaard, Tobias Kjær ; Mauro, John C. ; Smedskjær, Morten Mattrup. / Time and Humidity Dependence of Indentation Cracking in Aluminosilicate Glasses. Poster presented at 2018 Glass and Optical Materials Division Annual Meeting, San Antonio, United States.
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Bechgaard, TK, Mauro, JC & Smedskjær, MM 2018, 'Time and Humidity Dependence of Indentation Cracking in Aluminosilicate Glasses', 2018 Glass and Optical Materials Division Annual Meeting, San Antonio, United States, 20/05/2018 - 24/05/2018. https://doi.org/10.1016/j.jnoncrysol.2018.04.009

Time and Humidity Dependence of Indentation Cracking in Aluminosilicate Glasses. / Bechgaard, Tobias Kjær; Mauro, John C.; Smedskjær, Morten Mattrup.

2018. Poster presented at 2018 Glass and Optical Materials Division Annual Meeting, San Antonio, United States.

Research output: Contribution to conference without publisher/journalPosterResearchpeer-review

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AU - Bechgaard, Tobias Kjær

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AB - The inherent brittleness and poor crack resistance of oxide glasses have always been among their main limitations for many advanced applications. As the formation of cracks leads to amplification of applied tensile stresses and ultimately catastrophic failure, there is an interest in understanding the compositional and structural dependence of crack initiation and growth. The resistance to cracking can conventionally be measured using instrumented indentation that mimics the real-life damage for certain applications. Wada introduced a method to evaluate the crack resistance by counting the number of initiated cracks as a function of the applied load. Experiments have shown that the environmental humidity and the time period between indentation and crack counting both affect the crack resistance value, but unfortunately these parameters are not always reported in literature studies. Here we perform a systematic study of the time and humidity dependence of crack initiation in calcium aluminosilicate glasses. Depending on the experimental conditions (time and humidity), the crack resistance of an aluminosilicate glass can vary by more than a factor of two. Furthermore, the observed radial/median cracks can initiate several hours after indentation. These results therefore indicate the need for a standardized procedure for determination of crack resistance to allow comparison of data from different research groups. We suggest including a sufficiently long waiting period (such as 24 h) between indentation and crack counting, as the majority of the crack initiation will then have occurred.

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Bechgaard TK, Mauro JC, Smedskjær MM. Time and Humidity Dependence of Indentation Cracking in Aluminosilicate Glasses. 2018. Poster presented at 2018 Glass and Optical Materials Division Annual Meeting, San Antonio, United States. https://doi.org/10.1016/j.jnoncrysol.2018.04.009