A New Approach to Edge Stress Measurement in Tempered Glass Panels

Aben, Hillar; Lochegnies, Dominique; Chen, Y.; Anton, Johan; Paemurru, Mart; Õis, Marella

doi:10.1007/s11340-014-9950-7

Cited by 11 publications

(3 citation statements)

References 5 publications

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“…Conventional optics methods include the use of photoelasticity [8], whereas methods based on scattered light are becoming more popular (e.g. [9,10]) as a reliable technique. It is believed that recently developed scattered light polariscopes (SCALP) [10,11], which determine stresses in glass based on measurement of polarisation of an input laser beam, can be used to measure residual stresses in glass up to about a few millimetres deep from the surface.…”

Section: Experimental Characterisation Of Residual Stresses In Construction-sector Glassmentioning

confidence: 99%

“…[9,10]) as a reliable technique. It is believed that recently developed scattered light polariscopes (SCALP) [10,11], which determine stresses in glass based on measurement of polarisation of an input laser beam, can be used to measure residual stresses in glass up to about a few millimetres deep from the surface. However, reliable SCALPs are not widely available among the engineers, and even using one only the residual stresses in the surface regions of glass sheets can be measured.…”

Section: Experimental Characterisation Of Residual Stresses In Construction-sector Glassmentioning

confidence: 99%

“…For example, results obtained from SCALPs suggest a parabolic shape of the residual depth profile in annealed and thermallystrengthened glass (e.g. [6,9,10,16]).…”

Section: Residual Stress Depth Profile In Construction-sector Glassmentioning

confidence: 99%

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A validated modelling technique for incorporating residual stresses in glass structural design

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Section: Experimental Characterisation Of Residual Stresses In Construction-sector Glassmentioning

confidence: 99%

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Relation between edge stress, bending strength, surface stress and fracture pattern of thermally toughened glass

Efferz,

Thiele,

Schuster

et al. 2024

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Thermally toughened safety glass must meet safety requirements in the building industry. Here, destructive tests are defined in the product standards, which must be carried out on small, standardized format (360 mm × 1100 mm) glass elements to determine the fracture pattern and bending strength. This is costly and not in the interests of sustainability. As part of the quality control of optical anisotropy effects in thermally toughened glass, isochromatic scans that can provide information on the edge stress are acquired. The evaluation of the isochromatics and retardations at the edge with deduction of the edge stress and transfer to bending strength and fracture pattern could provide essential findings for assuring the safety requirements of thermally toughened glass. In this experimental investigation, the surface and edge stress were measured on standardized format thermally toughened safety glass, with different edge processing and glass thicknesses from three different suppliers. Afterwards, the fracture pattern is controlled, or the bending strength is analyzed in a destructive four-point bending test. Conclusively, the results from the photoelastic and destructive tests are compared to determine whether the photoelastic measurement methods used to measure surface and edge stress can be employed as quality control.

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Photoelastic measurements and evaluation methods for edge stress in architectural tempered glass

Efferz,

Schuler,

Siebert

2024

Glass Struct Eng

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The mechanical and safety-relevant properties of tempered architectural glass are tested using destructive bending strength and fracture pattern tests. The edge stress provides essential information on the quality of the tempering process and can, therefore, be used to ensure quality characteristics. The paper shows that the current valid evaluation method for edge stress, according to ASTM C 1279-09, is unsuitable for architectural glass. The chamfer which is required for tempered glass by the European standards for tempered glass prevents the direct measurement of retardation and edge stress. Therefore, an extrapolation of the retardation curve towards the edge is necessary. The paper compares fitting functions of different polynomial degrees to determine and assess the edge stress. The objective is to develop a proper evaluation method of edge stress for quality control in the latest inline measurement systems which can be applied to replace operator-dependent measuring devices. The study presents appropriate methods and evaluates them through experimental investigations using the phase shift technique and multiple wavelength photoelasticity.

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A New Approach to Edge Stress Measurement in Tempered Glass Panels

Cited by 11 publications

References 5 publications

A validated modelling technique for incorporating residual stresses in glass structural design

A validated modelling technique for incorporating residual stresses in glass structural design

Relation between edge stress, bending strength, surface stress and fracture pattern of thermally toughened glass

Photoelastic measurements and evaluation methods for edge stress in architectural tempered glass

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