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AIMS Materials Science, 2017, 4(2): 391-412. doi: 10.3934/matersci.2017.2.391. Research article

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FEM-DBEM approach to analyse crack scenarios in a baffle cooling pipe undergoing heat flux from the plasma

R. Citarella, V. Giannella, M. A. Lepore, J. Fellinger

1 Department of Industrial Engineering, via Giovanni Paolo II, 132, University of Salerno, Fisciano (SA), Italy
2 Max-Planck-Institut Für Plasmaphysik, Teilinstitut Greifswald, Greifswald, Germany

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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.

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Keywords: FEM-DBEM; Wendelstein 7-X; cracks; thermal-stress

Citation: R. Citarella, V. Giannella, M. A. Lepore, J. Fellinger. FEM-DBEM approach to analyse crack scenarios in a baffle cooling pipe undergoing heat flux from the plasma. AIMS Materials Science, 2017, 4(2): 391-412. doi: 10.3934/matersci.2017.2.391

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This article has been cited by:

1. Riccardo Rufini, Orlando Di Pietro, Andrea Di Schino, Predictive Simulation of Plastic Processing of Welded Stainless Steel Pipes, Metals, 2018, 8, 7, 519, 10.3390/met8070519
2. Marcello Antonio Lepore, Rustam Yarullin, Angelo Rosario Maligno, Raffaele Sepe, A computational strategy for damage-tolerant design of hollow shafts under mixed-mode loading condition, Fatigue & Fracture of Engineering Materials & Structures, 2018, 10.1111/ffe.12934
3. Marcello Lepore, Filippo Berto, Angelo R. Maligno, Joris Fellinger, Nonlinear fatigue crack propagation in a baffle module of Wendelstein 7‐X under cyclic bending loads, Fatigue & Fracture of Engineering Materials & Structures, 2019, 10.1111/ffe.13013

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Copyright Info: 2017, R. Citarella, et al., licensee AIMS Press. This is an open access article distributed under the terms of the Creative Commons Attribution Licese (http://creativecommons.org/licenses/by/4.0)

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