Abstract
The practical strength of glass with a value of about 100 MPa is approximately 100 times smaller than its theoretical ones [1]. This is due to micro flaws on the glass surface, which amount up to 50.000 on one cm2[2]. During the handling of glass externals stresses are amplified by these flaws, like clefts, pores or inclusions [3]. The degree of amplification depends on the geometry of the crack tip, which can be strongly influenced by chemical interactions with the surroundings. Depending on the intensity of these external influences, a rather slow crack propagation is observed under subcritical load (static fatigue). However, when the applied tensile stress exceeds a critical value (Kic-factor) the crack grows spontaneously with almost the speed of sound [4,5], leading essentially to the breaking of the glass.
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References
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Gier, A., Endres, K., Anschütz, D., Mennig, M., Schmidt, H. (2004). Coatings for Increasing and Preserving the Bending Strength of Glass. In: Aegerter, M.A., Mennig, M. (eds) Sol-Gel Technologies for Glass Producers and Users. Springer, Boston, MA. https://doi.org/10.1007/978-0-387-88953-5_31
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DOI: https://doi.org/10.1007/978-0-387-88953-5_31
Publisher Name: Springer, Boston, MA
Print ISBN: 978-1-4419-5455-8
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