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Finite element modeling of thermal stress in ITER prototype optical windows and its influencing parameters

Marijke Jacobs, Guido Van Oost (UGent) , Joris Degrieck (UGent) , Ives De Baere (UGent) , Andrei Goussarov and Vincent Massaut
(2010) ADVANCES IN SCIENCE AND TECHNOLOGY. 64(2010). p.145-150
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Abstract
Glass-metal joints are needed for the optical windows in ITER to perform diagnostics. These joints must be leak tight for the safety (presence of tritium in ITER) and to preserve the vacuum. They must also withstand the ITER environment: temperatures around 250 °C and neutron fluxes of 109 n/cm2.s. At the moment, little information is available about glass-metal joints suitable for ITER. Therefore, we set-up a 2D elastic model of prototype Al diffusion bonded optical windows using Abaqus code to model temperature effects on the windows. With this model we analyzed the influence of different parameters like the joint area and the braze thickness on the mechanical properties of the joint. Calculations of the thermal stress created by a temperature field of 150 °C (normal ITER temperature) showed that the Al-bond is the weakest part of the window. To find a way of reducing the thermal stress, the influence of some parameters has been studied. In particular, a specific thickness of the Al layer can result in a minimum of stress in the Al bond while the joint area and the thickness of the glass have only a small influence on the stress in the windows. The calculations allowed to propose an optimized design for the windows prototypes.
Keywords
Modeling, Optical window, Bonding

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MLA
Jacobs, Marijke, et al. “Finite Element Modeling of Thermal Stress in ITER Prototype Optical Windows and Its Influencing Parameters.” ADVANCES IN SCIENCE AND TECHNOLOGY, vol. 64, no. 2010, Trans Tech Publications ltd, 2010, pp. 145–50, doi:10.4028/www.scientific.net/AST.64.145.
APA
Jacobs, M., Van Oost, G., Degrieck, J., De Baere, I., Goussarov, A., & Massaut, V. (2010). Finite element modeling of thermal stress in ITER prototype optical windows and its influencing parameters. ADVANCES IN SCIENCE AND TECHNOLOGY, 64(2010), 145–150. https://doi.org/10.4028/www.scientific.net/AST.64.145
Chicago author-date
Jacobs, Marijke, Guido Van Oost, Joris Degrieck, Ives De Baere, Andrei Goussarov, and Vincent Massaut. 2010. “Finite Element Modeling of Thermal Stress in ITER Prototype Optical Windows and Its Influencing Parameters.” In ADVANCES IN SCIENCE AND TECHNOLOGY, 64:145–50. Stafa-Zürich, Switzerland: Trans Tech Publications ltd. https://doi.org/10.4028/www.scientific.net/AST.64.145.
Chicago author-date (all authors)
Jacobs, Marijke, Guido Van Oost, Joris Degrieck, Ives De Baere, Andrei Goussarov, and Vincent Massaut. 2010. “Finite Element Modeling of Thermal Stress in ITER Prototype Optical Windows and Its Influencing Parameters.” In ADVANCES IN SCIENCE AND TECHNOLOGY, 64:145–150. Stafa-Zürich, Switzerland: Trans Tech Publications ltd. doi:10.4028/www.scientific.net/AST.64.145.
Vancouver
1.
Jacobs M, Van Oost G, Degrieck J, De Baere I, Goussarov A, Massaut V. Finite element modeling of thermal stress in ITER prototype optical windows and its influencing parameters. In: ADVANCES IN SCIENCE AND TECHNOLOGY. Stafa-Zürich, Switzerland: Trans Tech Publications ltd; 2010. p. 145–50.
IEEE
[1]
M. Jacobs, G. Van Oost, J. Degrieck, I. De Baere, A. Goussarov, and V. Massaut, “Finite element modeling of thermal stress in ITER prototype optical windows and its influencing parameters,” in ADVANCES IN SCIENCE AND TECHNOLOGY, Montecatini Terme, Italy, 2010, vol. 64, no. 2010, pp. 145–150.
@inproceedings{1042737,
  abstract     = {{Glass-metal joints are needed for the optical windows in ITER to perform diagnostics. These joints must be leak tight for the safety (presence of tritium in ITER) and to preserve the vacuum. They must also withstand the ITER environment: temperatures around 250 °C and neutron fluxes of 109 n/cm2.s. At the moment, little information is available about glass-metal joints suitable for ITER. Therefore, we set-up a 2D elastic model of prototype Al diffusion bonded optical windows using Abaqus code to model temperature effects on the windows. With this model we analyzed the influence of different parameters like the joint area and the braze thickness on the mechanical properties of the joint. Calculations of the thermal stress created by a temperature field of 150 °C (normal ITER temperature) showed that the Al-bond is the weakest part of the window. To find a way of reducing the thermal stress, the influence of some parameters has been studied. In particular, a specific thickness of the Al layer can result in a minimum of stress in the Al bond while the joint area and the thickness of the glass have only a small influence on the stress in the windows. The calculations allowed to propose an optimized design for the windows prototypes.}},
  author       = {{Jacobs, Marijke and Van Oost, Guido and Degrieck, Joris and De Baere, Ives and Goussarov, Andrei and Massaut, Vincent}},
  booktitle    = {{ADVANCES IN SCIENCE AND TECHNOLOGY}},
  issn         = {{1662-0356}},
  keywords     = {{Modeling,Optical window,Bonding}},
  language     = {{eng}},
  location     = {{Montecatini Terme, Italy}},
  number       = {{2010}},
  pages        = {{145--150}},
  publisher    = {{Trans Tech Publications ltd}},
  title        = {{Finite element modeling of thermal stress in ITER prototype optical windows and its influencing parameters}},
  url          = {{http://doi.org/10.4028/www.scientific.net/AST.64.145}},
  volume       = {{64}},
  year         = {{2010}},
}
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