Using the two-point bend technique to determine failure stress of pristine glass fibers

Tang, Zhenwei; Lower, Nathan P.; Gupta, Prabhat K.; Kurkjian, Charles R.; Brow, Richard K.

doi:10.1016/j.jnoncrysol.2015.08.005

Cited by 9 publications

(4 citation statements)

References 32 publications

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“…Breakage bending radius, as one of the most primary parameters, was gauged with the self‐made equipment, as shown in Figure 2. The 2‐point bending method is used, where the flexible glass is placed between two parallel plates, with both ends of glass touching the baffle plate 17,18 . As one baffle plate approaches the other at a speed of 2 mm/s, the specimen is gradually bent and deformed until it breaks at a certain distance H .…”

Section: Methodsmentioning

confidence: 99%

“…The 2-point bending method is used, where the flexible glass is placed between two parallel plates, with both ends of glass touching the baffle plate. 17,18 As one baffle plate approaches the other at a speed of 2 mm/s, the specimen is gradually bent and deformed until it breaks at a certain distance H. As the exact location of the failure is hard to be captured, half of the faceplate spacing is used to characterize the bending performance of UTG. Ten tests were performed for each group of specimens to minimize errors.…”

Section: Testing and Characterizationmentioning

confidence: 99%

“…According to Ref. [18], the maximum bending stress occurs at the mid-length and is given by the following equation:…”

Section: Bending Performancementioning

confidence: 99%

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Enhancing bending performance of ultrathin flexible glass through chemical strengthening

Mao,

Yuan,

Guo

et al. 2024

Int J of Appl Glass Sci

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Flexible glass with high bending strength is a remarkable component of flexible electronic displays. However, as a brittle material, its bending properties often do not meet requirements of application. To address this challenge, the application of chemical strengthening stands out as a viable approach to significantly bolster scratch resistance and bending strength in flexible glass. This study focuses on a conventional one‐step chemical strengthening method, employing molten potassium nitrate, to reinforce ultrathin aluminosilicate glass produced through the secondary down‐drawing thermoforming process. Effects of ion‐exchange temperature and time on mechanical properties of strengthened 110 µm flexible glass were investigated, and moreover, properties of strengthened ultrathin flexible glass with various thicknesses were compared. The results indicate that, after chemical strengthening at 380°C for 1 h, the compressive stress (CS) of 110 µm glass reaches 864.60 MPa, and the depth of layer is 15.86 µm, at which time the glass has the best bending performance and scratch resistance, and half of the faceplate spacing during glass breakage can be enhanced from 38.02 ± 2.7 to 8.40 ± 0.62 mm. For ultrathin flexible glass from 40 to 110 µm, after treatment at 380°C for 1 h, the CS of thick glass is higher than that of thin glass, and the enhancement of bending performance is better.

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Section: Methodsmentioning

confidence: 99%

Section: Testing and Characterizationmentioning

confidence: 99%

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Enhancing bending performance of ultrathin flexible glass through chemical strengthening

Mao,

Yuan,

Guo

et al. 2024

Int J of Appl Glass Sci

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“…In stress-free plate glass, a tensile stress of this magnitude at the contact circle of this size will usually create a ring crack in the plate glass, but this stress is not sufficient in the case of a PRD to cause such a crack since the fracture strength of pristine soda-lime glass fibers is in the range of 3-4 GPa. 18 In order for a PRD to disintegrate catastrophically, it is necessary for any cracks, induced by the compression process, to enter the tension zone in the head of the PRD. In the elastic regime, a Hertzian ring and associated cone crack can form, but because of the very high surface compressive stress, any cone cracks will grow almost parallel to the PRD surface, as has been shown experimentally by Chaudhri and Phillips 16 in the case of thermally tempered plate glass containing residual surface compressive stress of 100 MPa.…”

Section: Figmentioning

confidence: 99%

On the extraordinary strength of Prince Rupert's drops

Aben

Anton

Õis

et al. 2016

Applied Physics Letters

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Prince Rupert's drops (PRDs), also known as Batavian tears, have been in existence since the early 17th century. They are made of a silicate glass of a high thermal expansion coefficient and have the shape of a tadpole. Typically, the diameter of the head of a PRD is in the range of 5-15 mm and that of the tail is 0.5 to 3.0 mm. PRDs have exceptional strength properties: the head of a PRD can withstand impact with a small hammer, or compression between tungsten carbide platens to high loads of $15 000 N, but the tail can be broken with just finger pressure leading to catastrophic disintegration of the PRD. We show here that the high strength of a PRD comes from large surface compressive stresses in the range of 400-700 MPa, determined using techniques of integrated photoelasticity. The surface compressive stresses can suppress Hertzian cone cracking during impact with a small hammer or compression between platens. Finally, it is argued that when the compressive force on a PRD is very high, plasticity in the PRD occurs, which leads to its eventual destruction with increasing load. Published by AIP Publishing.

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