Schneider, Jens ; Aronen, Antti ; Hilcken, Jonas ; Nielsen, Jens ; Karvinen, Reijo ; Olesen, John F. (2016):
Stress relaxation in tempered glass caused by heat soak testing.
In: Engineering Structures, 122, pp. 42-49. Elsevier, ISSN 0141-0296,
DOI: 10.1016/j.engstruct.2016.04.024,
[Article]
Abstract
Heat soak testing of tempered glass is a thermal process required after the tempering process itself to bring glasses of commercial soda-lime-silica-glass to failure that are contaminated with nickel sulphide inclusions, diameter 50 mm to 500 mm typically. Thus, the tests avoid a so-called “spontaneous” breakage of the glass in building elements at ambient temperatures months or years later. According to industry standards, the duration of the tests typically differs between 1 h and 4 h at temperatures of 290 ± 10 °C. Although this temperature is well below the transformation temperature of commercial soda-lime-silica glass, it causes stress relaxation in tempered glass and the fracture pattern of the glass changes accordingly, especially thin glasses are affected. Based on the Tool-Narayanaswamy-Model, this paper comprises the theoretical background of the stress-relaxation-process and the results of a parameter study for its most influential technical parameters. Results are compared to photoelastic measurements of temper stresses and fracture patterns of tempered glass before and after a heat treatment similar to heat soak testing.
| Item Type: | Article |
|---|---|
| Erschienen: | 2016 |
| Creators: | Schneider, Jens ; Aronen, Antti ; Hilcken, Jonas ; Nielsen, Jens ; Karvinen, Reijo ; Olesen, John F. |
| Title: | Stress relaxation in tempered glass caused by heat soak testing |
| Language: | English |
| Abstract: | Heat soak testing of tempered glass is a thermal process required after the tempering process itself to bring glasses of commercial soda-lime-silica-glass to failure that are contaminated with nickel sulphide inclusions, diameter 50 mm to 500 mm typically. Thus, the tests avoid a so-called “spontaneous” breakage of the glass in building elements at ambient temperatures months or years later. According to industry standards, the duration of the tests typically differs between 1 h and 4 h at temperatures of 290 ± 10 °C. Although this temperature is well below the transformation temperature of commercial soda-lime-silica glass, it causes stress relaxation in tempered glass and the fracture pattern of the glass changes accordingly, especially thin glasses are affected. Based on the Tool-Narayanaswamy-Model, this paper comprises the theoretical background of the stress-relaxation-process and the results of a parameter study for its most influential technical parameters. Results are compared to photoelastic measurements of temper stresses and fracture patterns of tempered glass before and after a heat treatment similar to heat soak testing. |
| Journal or Publication Title: | Engineering Structures |
| Journal volume: | 122 |
| Publisher: | Elsevier |
| Uncontrolled Keywords: | Tempered glass, Heat soak test, Stress relaxation, Tool-Narayanaswamy-Model, Fracture pattern, Photoelastic measurements |
| Divisions: | 13 Department of Civil and Environmental Engineering Sciences 13 Department of Civil and Environmental Engineering Sciences > Institute für Structural Mechanics and Design 13 Department of Civil and Environmental Engineering Sciences > Institute für Structural Mechanics and Design > Structural Engineering |
| Date Deposited: | 15 Apr 2019 13:27 |
| DOI: | 10.1016/j.engstruct.2016.04.024 |
| Official URL: | http://www.sciencedirect.com/science/article/pii/S0141029616... |
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