Comparison of the Residual Stresses at the Edge and Surface of Thermally Toughened Glass

The strength of thermally toughened glass is regulated in EN 12150-1 for fully tempered glass (FTG) and EN 1863-1 for heat-strengthened glass (HSG). The manufacturer has to prove the strength by four-point bending tests based on EN 1288- 3. A measurement of the residual stresses of thermally toughe...

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Autores principales:	Katharina Lohr, Paulina Bukieda, Bernhard Weller
Formato:	article
Lenguaje:	EN
Publicado:	Challenging Glass Conference 2020
Materias:	Thermally toughened glass residual stress glass edge edge strength photoelastic measurements Clay industries. Ceramics. Glass TP785-869
Acceso en línea:	https://doaj.org/article/0f6fa2564bf244799b7d44f0f72fd636
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spelling	oai:doaj.org-article:0f6fa2564bf244799b7d44f0f72fd6362021-12-04T05:11:46ZComparison of the Residual Stresses at the Edge and Surface of Thermally Toughened Glass10.7480/cgc.7.52262589-8019https://doaj.org/article/0f6fa2564bf244799b7d44f0f72fd6362020-09-01T00:00:00Zhttps://proceedings.challengingglass.com/index.php/cgc/article/view/286https://doaj.org/toc/2589-8019 The strength of thermally toughened glass is regulated in EN 12150-1 for fully tempered glass (FTG) and EN 1863-1 for heat-strengthened glass (HSG). The manufacturer has to prove the strength by four-point bending tests based on EN 1288- 3. A measurement of the residual stresses of thermally toughened glass is not demanded. Consequently, the determination of the strength is containing the amount of residual stresses. As residual stress is depending on the manufacturing process, the amount and distribution can change within one glass pane and between different glass panes. A research project determined the residual stresses at the surfaces and the edges of HSG and FTG with varying glass thicknesses using photoelastic measurements. Thereby, FTG showed lower values of the residual stresses at the edge compared to the surface. Looking at HSG, the results of the residual stresses at the edge and surface were nearly the same. To analyse the edge strength, four-point bending tests were conducted. Thereby, the load was introduced into the strong axis of the specimens to implement constant tensile stresses along the glass edge. The comparison of the edge strengths showed that the edge strength of FTG is in the same range than HSG. Therefore, the lower residual stress at the edge of FTG reflects in significantly lower edge strengths. The paper includes a detailed presentation of the photoelastic measurements at the edge and the surface as well as the determined residual stresses of more than 80 specimens. In addition, the conducted four-point bending tests are described and the obtained edge strengths are correlated to the measured residual stresses. Based on that, the paper contains a discussion of the standardisations, the process of thermally prestressing and the consequences for the final glass strengths. Katharina LohrPaulina BukiedaBernhard WellerChallenging Glass ConferencearticleThermally toughened glassresidual stressglass edgeedge strengthphotoelastic measurementsClay industries. Ceramics. GlassTP785-869ENChallenging Glass Conference Proceedings, Vol 7, Iss 1 (2020)
institution	DOAJ
collection	DOAJ
language	EN
topic	Thermally toughened glass residual stress glass edge edge strength photoelastic measurements Clay industries. Ceramics. Glass TP785-869
spellingShingle	Thermally toughened glass residual stress glass edge edge strength photoelastic measurements Clay industries. Ceramics. Glass TP785-869 Katharina Lohr Paulina Bukieda Bernhard Weller Comparison of the Residual Stresses at the Edge and Surface of Thermally Toughened Glass
description	The strength of thermally toughened glass is regulated in EN 12150-1 for fully tempered glass (FTG) and EN 1863-1 for heat-strengthened glass (HSG). The manufacturer has to prove the strength by four-point bending tests based on EN 1288- 3. A measurement of the residual stresses of thermally toughened glass is not demanded. Consequently, the determination of the strength is containing the amount of residual stresses. As residual stress is depending on the manufacturing process, the amount and distribution can change within one glass pane and between different glass panes. A research project determined the residual stresses at the surfaces and the edges of HSG and FTG with varying glass thicknesses using photoelastic measurements. Thereby, FTG showed lower values of the residual stresses at the edge compared to the surface. Looking at HSG, the results of the residual stresses at the edge and surface were nearly the same. To analyse the edge strength, four-point bending tests were conducted. Thereby, the load was introduced into the strong axis of the specimens to implement constant tensile stresses along the glass edge. The comparison of the edge strengths showed that the edge strength of FTG is in the same range than HSG. Therefore, the lower residual stress at the edge of FTG reflects in significantly lower edge strengths. The paper includes a detailed presentation of the photoelastic measurements at the edge and the surface as well as the determined residual stresses of more than 80 specimens. In addition, the conducted four-point bending tests are described and the obtained edge strengths are correlated to the measured residual stresses. Based on that, the paper contains a discussion of the standardisations, the process of thermally prestressing and the consequences for the final glass strengths.
format	article
author	Katharina Lohr Paulina Bukieda Bernhard Weller
author_facet	Katharina Lohr Paulina Bukieda Bernhard Weller
author_sort	Katharina Lohr
title	Comparison of the Residual Stresses at the Edge and Surface of Thermally Toughened Glass
title_short	Comparison of the Residual Stresses at the Edge and Surface of Thermally Toughened Glass
title_full	Comparison of the Residual Stresses at the Edge and Surface of Thermally Toughened Glass
title_fullStr	Comparison of the Residual Stresses at the Edge and Surface of Thermally Toughened Glass
title_full_unstemmed	Comparison of the Residual Stresses at the Edge and Surface of Thermally Toughened Glass
title_sort	comparison of the residual stresses at the edge and surface of thermally toughened glass
publisher	Challenging Glass Conference
publishDate	2020
url	https://doaj.org/article/0f6fa2564bf244799b7d44f0f72fd636
work_keys_str_mv	AT katharinalohr comparisonoftheresidualstressesattheedgeandsurfaceofthermallytoughenedglass AT paulinabukieda comparisonoftheresidualstressesattheedgeandsurfaceofthermallytoughenedglass AT bernhardweller comparisonoftheresidualstressesattheedgeandsurfaceofthermallytoughenedglass
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Comparison of the Residual Stresses at the Edge and Surface of Thermally Toughened Glass

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