Abstract
Soft layers are of great interest for the joining of dissimilar materials like beryllium, tungsten or carbon base refractory tiles for plasma interfaces and cooled structures made of copper or molybdenum in TOKAMAK thermonuclear fusion reactors. Soft layers reduce the residual and in-service stress/strain levels without reducing the thermal capability. Thin, soft layer interfaces are produced during the brazing or HIP bonding cycles. However, the numerical modeling of the mechanical effect of such soft layers remains largely inaccurate. The camber of [CFC tiles (A05, NI-1 NI-12)lAg- Cu-Ti filler metal, OFHC or TZM substrate assemblies is recorded during the whole brazing thermal cycle and subsequent thermal fatigue cycles using a special vertical dilatometer. An inverse method based on Finite Element modeling of the samples is used to determine the joint constitutive law. Then, by comparing experiments and FEM calculations, the effects of distributed damage of the CFC and of the strain hardening and thermal softening of OFHC on the in-service stress/strain state of the component are observed.
Résumé
Les lois constitutives de fines brasures ou de couches compliantes liant des matériaux dissemblables sont nécessaires pour la conception mécanique de tels ensembles. Pourtant, leur détermination est difficile voire impossible par des mesures directes en tension ou en cisaillement. Une procédure spéciale a été établie, basée sur le suivi de la cambrure d’un échantillon bimetallique en fonction de la temperature. A l’aide d’une modélisation en éléments finis de l’échantillon et l’utilisation d’une méthode inverse, les propriétés susvisées ont pu être déterminées. L’application de cette étude à quelques couples de matériaux est présentée.
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© 1998 Springer-Verlag Berlin Heidelberg
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Lovato, G., Moret, F., Chavmat, G., Cailletaud, G., Pilvin, P. (1998). Materials Data for Thin Interlayers by an Inverse Method: The Case of a Constitutive Law of Brazes. In: Caliste, JP., Truyol, A., Westbrook, J.H. (eds) Thermodynamic Modeling and Materials Data Engineering. Data and Knowledge in a Changing World. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-72207-3_38
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DOI: https://doi.org/10.1007/978-3-642-72207-3_38
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