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Effect of loading rate, surface flaw length and orientation on strength of laser-modified architectural glass

Shahryar Nategh (UGent) , Evelien Symoens (UGent) , Jeroen Missinne (UGent) and Jan Belis (UGent)
(2021) IABSE Congress : Structural Engineering for Future Societal Needs. In IABSE Congress Reports 21. p.1581-1588
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Abstract
The strength of architectural glass (soda-lime silica) is highly dependent on surface flaws generated during production, handling and service life. Fracture mechanical investigation of glass, however, is challenging due to e.g. the randomness of flaw size, flaw orientation and quality. Generation of radial and median cracks is inevitable while using a mechanical indenter with direct contact. These undesirable effects, along with uncertainty about the groove’s depth and geometry, degrade the accuracy of results and underline the need for a more reliable tool. Consequently, this contribution focuses instead on the application of ultra-short laser as a non-contact tool, which recently has proved to be a promising solution because of its precision, high speed, and repeatability. Here, artificial grooves with a well-controlled depth are realized on the surface of soda-lime silica glass to investigate the effects of loading rate, flaw size and flaw orientation on the glass strength. Four- point bending tests are performed to assess the failure loads. The method manages to capture the results with a very low standard deviation of the failure stress (approximately 1 MPa), eliminating the need for using large series of specimens.
Keywords
Glass, Surface flaw, Ultra-short laser ablation, Fracture mechanics, Flexural strength

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MLA
Nategh, Shahryar, et al. “Effect of Loading Rate, Surface Flaw Length and Orientation on Strength of Laser-Modified Architectural Glass.” IABSE Congress : Structural Engineering for Future Societal Needs, edited by H. H. (Bert) Snijder et al., vol. 21, International Association for Bridge and Structural Engineering (IABSE), 2021, pp. 1581–88, doi:10.2749/ghent.2021.1581.
APA
Nategh, S., Symoens, E., Missinne, J., & Belis, J. (2021). Effect of loading rate, surface flaw length and orientation on strength of laser-modified architectural glass. In H. H. (Bert) Snijder, B. De Pauw, S. van Alphen, & P. Mengeot (Eds.), IABSE Congress : Structural Engineering for Future Societal Needs (Vol. 21, pp. 1581–1588). https://doi.org/10.2749/ghent.2021.1581
Chicago author-date
Nategh, Shahryar, Evelien Symoens, Jeroen Missinne, and Jan Belis. 2021. “Effect of Loading Rate, Surface Flaw Length and Orientation on Strength of Laser-Modified Architectural Glass.” In IABSE Congress : Structural Engineering for Future Societal Needs, edited by H. H. (Bert) Snijder, Bart De Pauw, Sander van Alphen, and Pierre Mengeot, 21:1581–88. International Association for Bridge and Structural Engineering (IABSE). https://doi.org/10.2749/ghent.2021.1581.
Chicago author-date (all authors)
Nategh, Shahryar, Evelien Symoens, Jeroen Missinne, and Jan Belis. 2021. “Effect of Loading Rate, Surface Flaw Length and Orientation on Strength of Laser-Modified Architectural Glass.” In IABSE Congress : Structural Engineering for Future Societal Needs, ed by. H. H. (Bert) Snijder, Bart De Pauw, Sander van Alphen, and Pierre Mengeot, 21:1581–1588. International Association for Bridge and Structural Engineering (IABSE). doi:10.2749/ghent.2021.1581.
Vancouver
1.
Nategh S, Symoens E, Missinne J, Belis J. Effect of loading rate, surface flaw length and orientation on strength of laser-modified architectural glass. In: Snijder HH (Bert), De Pauw B, van Alphen S, Mengeot P, editors. IABSE Congress : Structural Engineering for Future Societal Needs. International Association for Bridge and Structural Engineering (IABSE); 2021. p. 1581–8.
IEEE
[1]
S. Nategh, E. Symoens, J. Missinne, and J. Belis, “Effect of loading rate, surface flaw length and orientation on strength of laser-modified architectural glass,” in IABSE Congress : Structural Engineering for Future Societal Needs, Ghent, Belgium, 2021, vol. 21, pp. 1581–1588.
@inproceedings{8723500,
  abstract     = {{The strength of architectural glass (soda-lime silica) is highly dependent on surface flaws generated during production, handling and service life. Fracture mechanical investigation of glass, however, is challenging due to e.g. the randomness of flaw size, flaw orientation and quality. Generation of radial and median cracks is inevitable while using a mechanical indenter with direct contact. These undesirable effects, along with uncertainty about the groove’s depth and geometry, degrade the accuracy of results and underline the need for a more reliable tool. Consequently, this contribution focuses instead on the application of ultra-short laser as a non-contact tool, which recently has proved to be a promising solution because of its precision, high speed, and repeatability. Here, artificial grooves with a well-controlled depth are realized on the surface of soda-lime silica glass to investigate the effects of loading rate, flaw size and flaw orientation on the glass strength. Four- point bending tests are performed to assess the failure loads. The method manages to capture the results with a very low standard deviation of the failure stress (approximately 1 MPa), eliminating the need for using large series of specimens.}},
  author       = {{Nategh, Shahryar and Symoens, Evelien and Missinne, Jeroen and Belis, Jan}},
  booktitle    = {{IABSE Congress : Structural Engineering for Future Societal Needs}},
  editor       = {{Snijder, H. H. (Bert) and De Pauw, Bart and van Alphen, Sander and Mengeot, Pierre}},
  isbn         = {{9783857481765}},
  keywords     = {{Glass,Surface flaw,Ultra-short laser ablation,Fracture mechanics,Flexural strength}},
  language     = {{eng}},
  location     = {{Ghent, Belgium}},
  pages        = {{1581--1588}},
  publisher    = {{International Association for Bridge and Structural Engineering (IABSE)}},
  title        = {{Effect of loading rate, surface flaw length and orientation on strength of laser-modified architectural glass}},
  url          = {{http://doi.org/10.2749/ghent.2021.1581}},
  volume       = {{21}},
  year         = {{2021}},
}
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