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3-D simulation of macroscopic erosion of CFC under ITER off-normal heat loads

Pestchanyi, S.; Würz, H.

Abstract:
Because of their high heat conductivity carbon fiber composites (CFC) are considered as armour material for the vertical target in the divertor strike point region where high heat loads are expected during off-normal heat loads. The newly developed CFCs have a complex 3-D framework from ex-PAN and ex-pitch carbon fibers. The framework is filled with a carbon matrix. Both fibers are anisotropic materials. The linear thermal expansion coefficient, the heat conductivity and the Young’s modulus along and across the fiber direction are 10-50 times different. This anisotropy and the difference of the linear thermal expansion coefficient of the matrix and the fibers cause larger internal thermostress in CFC as compared to graphite. The thermostress concentrates at the interfaces between fibers and matrix, especially close to the sites of the perpendicular intersection of the fibers. There is experimental evidence of formation of large macroscopic pits at such intersections under high heat loads [1] and if those pits combine there occurs large macroscopic erosion by brittle destruction [2]. Indeed first experimental results for CFC samples heated by quasistationary surface heat loads to temperatures of about 3050 K have shown rather large macroscopic erosion by brittle destruction of fibers, parallel to the CFC surface [3]. ... mehr



Originalveröffentlichung
DOI: 10.1016/S0920-3796(03)00143-1
Scopus
Zitationen: 12
Dimensions
Zitationen: 6
Zugehörige Institution(en) am KIT Institut für Hochleistungsimpuls- und Mikrowellentechnik (IHM)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2003
Sprache Englisch
Identifikator ISSN: 0272-3921, 0748-1896
KITopen-ID: 110051732
HGF-Programm 31.02.03 (Vor POF, LK 01)
Erschienen in Fusion technology
Verlag Société d'Etudes des Sciences Naturelles (SESNNG)
Band 66-68
Seiten 271-276
Externe Relationen Abstract/Volltext
Nachgewiesen in Web of Science
Dimensions
Scopus
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