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Aiming at understanding thermo-mechanical loads in the first wall of DEMO: Stress–strain evolution in a Eurofer-tungsten test component featuring a functionally graded interlayer
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SYSNO ASEP 0492145 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Aiming at understanding thermo-mechanical loads in the first wall of DEMO: Stress–strain evolution in a Eurofer-tungsten test component featuring a functionally graded interlayer Author(s) Heuer, S. (DE)
Weber, T. (DE)
Pintsuk, G. (DE)
Coenen, J.W. (DE)
Matějíček, Jiří (UFP-V) RID, ORCID
Linsmeier, Ch. (DE)Number of authors 6 Source Title Fusion Engineering and Design. - : Elsevier - ISSN 0920-3796
Roč. 135, October (2018), s. 141-153Number of pages 13 s. Language eng - English Country NL - Netherlands Keywords Nuclear fusion ; DEMO ; First wall ; Finite Element Analysis ; Functionally graded materials (FGM) ; Fe/W Subject RIV JI - Composite Materials OECD category Composites (including laminates, reinforced plastics, cermets, combined natural and synthetic fibre fabrics R&D Projects GA17-23154S GA ČR - Czech Science Foundation (CSF) Institutional support UFP-V - RVO:61389021 UT WOS 000447082300019 EID SCOPUS 85050945680 DOI 10.1016/j.fusengdes.2018.07.011 Annotation For the future fusion demonstration power plant, DEMO, several blanket designs are currently under consideration.
Despite geometric and operational differences, all designs suggest a first wall (FW), in which tungsten (W) armour is joined to a structure made of Reduced Activation Ferritic Martensitic (RAFM) steel. In thermomechanical analyses of breeding blankets, this joint has received limited attention. In order to provide a basis for better understanding of thermally induced stresses and strains in the FW, the thermo-mechanical behaviour of a water-cooled test component is explored in the current contribution. The model aims at providing a simple geometry that allows straightforward comparison of numerical and experimental results, while trying to keep boundary conditions as realistic as possible. A test component with direct RAFM steel-W joint, and a test component with a stress-redistributing, functionally graded RAFM steel/W interlayer in the joint is considered in the current contribution. The analyses take production- and operation-related loads into account. Following a detailed analysis of the evolution of stress components and strain in the model, a parameter study with respect to geometric specifications and loads is presented.
The analyses show that, even in a small test component, a direct RAFM steel-W joint causes enormous plastic deformation. The implementation of a functionally graded interlayer reduces stresses and strains significantly, but vertical normal stresses at the joint's circumference remain considerable. With the component geometry considered here, the graded interlayer should be at least 1mm thick and contain 4 sublayers to appropriately redistribute stresses. Beyond a component width of 14 mm, stresses increase strongly, which may pose a risk to the applicability of large-scale FW components, too.Workplace Institute of Plasma Physics Contact Vladimíra Kebza, kebza@ipp.cas.cz, Tel.: 266 052 975 Year of Publishing 2019 Electronic address https://www.sciencedirect.com/science/article/pii/S0920379618305660?via%3Dihub
Number of the records: 1