FEM-DBEM approach to analyse crack scenarios in a baffle cooling pipe undergoing heat flux from the plasma
| Autor: | Roberto Guglielmo Citarella, Joris Fellinger, Venanzio Giannella, Marcello Antonio Lepore |
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| Rok vydání: | 2017 |
| Předmět: |
Materials science
Convective heat transfer education Baffle thermal-stress 02 engineering and technology Heat sink 010402 general chemistry 01 natural sciences law.invention law Heat shield lcsh:TA401-492 Wendelstein 7-X Nuclear fusion FEM-DBEM cracks business.industry Structural engineering Plasma Mechanics 021001 nanoscience & nanotechnology 0104 chemical sciences Heat flux lcsh:Materials of engineering and construction. Mechanics of materials 0210 nano-technology business Stellarator |
| Zdroj: | AIMS Materials Science AIMS Materials Science, Vol 4, Iss 2, Pp 391-412 (2017) |
| ISSN: | 2372-0484 |
| DOI: | 10.3934/matersci.2017.2.391 |
| Popis: | Wendelstein 7-X is the world’s largest nuclear fusion experiment of stellarator type, in which a hydrogen plasma is confined by a magnet field generated with external superconducting coils, allowing the plasma to be heated up to the fusion temperature. The water-cooled Plasma Facing Components (PFC) protect the Plasma Vessel (PV) against radiative and convective heat from the plasma. After the assembly process of heat shields and baffles, several cracks were found in the braze and cooling pipes. Due to heat load cycles occurring during each Operational Phase (OP), thermal stresses are generated in the heat sinks, braze root and cooling pipes, capable to drive fatigue crack-growth and, possibly, a water leak through the pipe thickness. The aim of this study is to assess the most dangerous initial crack configurations in one of the most critical baffles by using numerical models based on a FEM-DBEM approach. |
| Databáze: | OpenAIRE |
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