Experimental study on critical breaking stress of float glass under elevated temperature |
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Affiliation: | 1. State Key Laboratory of Fire Science, University of Science and Technology of China, Hefei 230026, China;2. Department of Civil and Architectural Engineering, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong;1. State Key Laboratory of Fire Science, University of Science and Technology of China, Hefei 230026, China;2. Collaborative Innovation Center for Urban Public Safety, Anhui Province, Hefei 230027, China;3. Department of Civil & Environmental Engineering, National University of Singapore, Singapore 117576, Singapore;4. Department of Architecture and Civil Engineering, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong;1. State Key Laboratory of Fire Science, University of Science and Technology of China, Hefei 230026, China;2. Department of Architecture and Civil Engineering, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong;1. State Key Laboratory of Fire Science, University of Science and Technology of China, Hefei 230026, China;2. Department of Civil and Architectural Engineering, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong;3. Huangpu Municipal Fire Brigade, Fire Department of Shanghai, Shanghai 200011, China;1. State Key Laboratory of Fire Science, University of Science and Technology of China, Hefei 230026, PR China;2. Collaborative Innovation Center for Urban Public Safety, Hefei 230026, Anhui Province, PR China;3. Department of Architecture and Civil Engineering, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, China;1. State Key Laboratory of Fire Science, University of Science and Technology of China, Hefei 230027, PR China;2. School of Engineering, The BRE Centre for Fire Safety Engineering, University of Edinburgh, Edinburgh EH9 3JL, UK |
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Abstract: | Cracking and subsequent fallout of glass may significantly affect fire dynamics in compartments. Moreover, the breaking tensile stress of glass, a crucial parameter for breakage occurrence, is the least well known among mechanical properties. In this work, a series of experiments were conducted, through mechanical tensile tests, to directly measure the breaking stress of float glass using Material Testing System 810 apparatus. Clear, ground and coated glass samples with a thickness of 6 mm were measured under ambient conditions, with a room temperature of 25 °C. The breaking stress of smooth glass samples was also measured at 75 °C, 100 °C, 125 °C, 150 °C, 200 °C, 300 °C and 400 °C, respectively. The results show that surface treatment may decrease the critical tensile stress of glass panes. The average breaking stress also fluctuates considerably, from 26.60 to 35.72 MPa with the temperature variations investigated here. At approximately 100 °C, critical stress reached the minimum value at which glass breakage occurs more easily. In addition, the thermal expansion coefficient was established using a thermal dilatometer, to obtain the maximum temperature difference float glass can withstand. It is intended that these results will provide some practical guidelines for fire safety engineers. |
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Keywords: | Critical breaking stress Float glass Temperature effect Surface treatment effect |
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