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A concept for measuring and evaluating optical anisotropy effects in tempered architectural glass

Record Type:	Electronic resources : Monograph/item
Title/Author:	A concept for measuring and evaluating optical anisotropy effects in tempered architectural glassby Steffen Dix.
Author:	Dix, Steffen.
Published:	Wiesbaden :Springer Fachmedien Wiesbaden :2024.
Description:	xvii, 147 p. :ill., digital ;24 cm.
Contained By:	Springer Nature eBook
Subject:	Anisotropy.
Online resource:	https://doi.org/10.1007/978-3-658-42029-1
ISBN:	9783658420291$q(electronic bk.)

A concept for measuring and evaluating optical anisotropy effects in tempered architectural glass
Dix, Steffen.

A concept for measuring and evaluating optical anisotropy effects in tempered architectural glass[electronic resource] /by Steffen Dix. - Wiesbaden :Springer Fachmedien Wiesbaden :2024. - xvii, 147 p. :ill., digital ;24 cm. - Mechanik, Werkstoffe und Konstruktion im Bauwesen,Band 702512-3246 ;. - Mechanik, Werkstoffe und Konstruktion im Bauwesen ;Band 47..

Introduction -- Theoretical Principles -- Glass and their Photoelastic Behaviour -- Photoelastic Methods for Measuring Anisotropy Effects -- Photoelastic Measurements on Tempered Flat Glass -- -Experimental Field Studies on Tempered Flat Glass -- Methods for evaluating Anisotropy Effects in Glass -- Evaluation and Concept -- Summary and further Research -- Experiments Results -- Field Study Test Results.

Optical anisotropy eﬀects can occur in building envelopes made of tempered glass. The visual eﬀect has been neglected in the evaluation of the building product and increasingly leads to disputes between the parties involved. This thesis extends the state of knowledge on the cause and perception of optical anisotropic eﬀects and presents a concept for measuring and evaluating them in ﬂat monolithic tempered architectural glass. Initially, an overview and description of current photoelastic measurement methods are given, and the accuracy of the used measurement setups is veriﬁed for the ﬁrst time. The experimental basis for the concept is formed by extensive full-ﬁeld retardation measurements in the laboratory and ﬁeld studies of the maximum visibility of the anisotropy eﬀects in an outdoor test rig with accompanying polarization measurements of the sky. Various glass types, geometries, and tempering levels are selected based on typically used products, and their inﬂuence on the resulting retardation image is investigated. Determining a correlation of the retardation images with the reﬂection images of selected test specimens in the outdoor test rig complements the experiments. Based on this, digital evaluation methods are presented, further developed, and applied to the measured retardation images. From the critical analysis of these results, limit values for diﬀerent anisotropy quality classes are derived, and the concept is complemented. With the implementation of the evaluation methods and the limit values in commercial anisotropy scanners, the quality of each glass pane can be determined directly after tempering in the future. By choosing the highest quality class A, it will be possible to signiﬁcantly reduce anisotropy eﬀects in constructions made of tempered glass panes. The Author Steffen Dix, began his career at seele GmbH in 2003 as a technical draftsman apprentice. In 2015, he received a Master's degree in civil engineering with a focus on steel, lightweight, and glass construction from the University of Applied Sciences in Munich. During his studies from 2009 to 2015, he worked in the Labor für Stahl- und Leichtmetallbau, starting as a working student and later as a Research Assistant. His research focused on adhesives in façade design and the strength and quality of pre-stressed glass products, culminating in his dissertation on the measurement and evaluation of optical anisotropy effects in tempered architectural glass. From 2016 to 2022, he also worked as a freelance expert in glass and façade construction for the Ingenieurbüro für Bautechnik Schuler in Karlsruhe. Since 2022, the author is working as Technical Solution Manager at Josef Gartner GmbH (Permasteelisa), where he develops individual and innovative façade constructions.

ISBN: 9783658420291$q(electronic bk.)

Standard No.: 10.1007/978-3-658-42029-1doiSubjects--Topical Terms:

207917
Anisotropy.

LC Class. No.: QD941

Dewey Class. No.: 548.9

A concept for measuring and evaluating optical anisotropy effects in tempered architectural glass
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505 0 $a Introduction -- Theoretical Principles -- Glass and their Photoelastic Behaviour -- Photoelastic Methods for Measuring Anisotropy Effects -- Photoelastic Measurements on Tempered Flat Glass -- -Experimental Field Studies on Tempered Flat Glass -- Methods for evaluating Anisotropy Effects in Glass -- Evaluation and Concept -- Summary and further Research -- Experiments Results -- Field Study Test Results.
520 $a Optical anisotropy eﬀects can occur in building envelopes made of tempered glass. The visual eﬀect has been neglected in the evaluation of the building product and increasingly leads to disputes between the parties involved. This thesis extends the state of knowledge on the cause and perception of optical anisotropic eﬀects and presents a concept for measuring and evaluating them in ﬂat monolithic tempered architectural glass. Initially, an overview and description of current photoelastic measurement methods are given, and the accuracy of the used measurement setups is veriﬁed for the ﬁrst time. The experimental basis for the concept is formed by extensive full-ﬁeld retardation measurements in the laboratory and ﬁeld studies of the maximum visibility of the anisotropy eﬀects in an outdoor test rig with accompanying polarization measurements of the sky. Various glass types, geometries, and tempering levels are selected based on typically used products, and their inﬂuence on the resulting retardation image is investigated. Determining a correlation of the retardation images with the reﬂection images of selected test specimens in the outdoor test rig complements the experiments. Based on this, digital evaluation methods are presented, further developed, and applied to the measured retardation images. From the critical analysis of these results, limit values for diﬀerent anisotropy quality classes are derived, and the concept is complemented. With the implementation of the evaluation methods and the limit values in commercial anisotropy scanners, the quality of each glass pane can be determined directly after tempering in the future. By choosing the highest quality class A, it will be possible to signiﬁcantly reduce anisotropy eﬀects in constructions made of tempered glass panes. The Author Steffen Dix, began his career at seele GmbH in 2003 as a technical draftsman apprentice. In 2015, he received a Master's degree in civil engineering with a focus on steel, lightweight, and glass construction from the University of Applied Sciences in Munich. During his studies from 2009 to 2015, he worked in the Labor für Stahl- und Leichtmetallbau, starting as a working student and later as a Research Assistant. His research focused on adhesives in façade design and the strength and quality of pre-stressed glass products, culminating in his dissertation on the measurement and evaluation of optical anisotropy effects in tempered architectural glass. From 2016 to 2022, he also worked as a freelance expert in glass and façade construction for the Ingenieurbüro für Bautechnik Schuler in Karlsruhe. Since 2022, the author is working as Technical Solution Manager at Josef Gartner GmbH (Permasteelisa), where he develops individual and innovative façade constructions.
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