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• W2309809634 abstract "Since glass is brittle and thermally insulating, significant thermal stresses, especially in larger components often lead to catastrophic failure. Our work combines experimental measurement of glass thermomechanical failure, as well as computational simulations of transient thermal stresses arising in precision optical component used in fusion research. For the experimental work, we have quenched our samples and correlated the critical temperature difference for thermal shock with surface finish. We have estimated the heat transfer coefficient and the depth of the strength controlling cracks on the edge of disk samples. We have also carried out ring -on-ring biaxial strength tests to measure strength degradation of BK7 disks after thermal shock. For the simulation work, we have calculated thermal stress using both fin approximation and finite element analysis of quenched BK7 disks. The effect of cooling fluid has been examined. To examine the effects of size and glass properties, the radiative cooling processes of BK7 and LHG8 plates are also discussed. We have compared the temperature and thermal stress evolution of BK7 and LHG8 glass plates. Crack size evolution and crack growth rate have been computed. We have used three approaches to describe crack growth: the strength approach, the fracture toughness approach and the slow crack growth approach. The effect of linear variation of surrounding temperature and mitigation strategy are discussed. In this study we also examine in detail the effects of crack geometry near an edge. In addition, we have examined the thermal stresses induced by rinsing. Rinsing is a configuration in-" @default.
• W2309809634 created "2016-06-24" @default.
• W2309809634 creator A5019708503 @default.
• W2309809634 date "2010-01-01" @default.
• W2309809634 modified "2023-09-27" @default.
• W2309809634 title "Thermal Stress Fracture of Optical Glasses" @default.
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• W2309809634 hasPublicationYear "2010" @default.
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