Finite Element Analysis of the Blanking and Stamping Processes of Nuclear Fuel Spacer Grids
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Finite Element Analysis of the Blanking and Stamping Processes of Nuclear Fuel Spacer Grids

Authors: R. O. Santos, L. P. Moreira, M. C. Cardoso

Abstract:

Spacer grid assembly supporting the nuclear fuel rods is an important concern in the design of structural components of a Pressurized Water Reactor (PWR). The spacer grid is composed by springs and dimples which are formed from a strip sheet by means of blanking and stamping processes. In this paper, the blanking process and tooling parameters are evaluated by means of a 2D plane-strain finite element model in order to evaluate the punch load and quality of the sheared edges of Inconel 718 strips used for nuclear spacer grids. A 3D finite element model is also proposed to predict the tooling loads resulting from the stamping process of a preformed Inconel 718 strip and to analyse the residual stress effects upon the spring and dimple design geometries of a nuclear spacer grid.

Keywords: Blanking process, damage model, finite element modelling, Inconel 718, spacer grids, stamping process.

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1108164

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References:


[1] J. Wang, N. Kim, and H. Lee, “Ductile fracture in the shearing process of Zircaloy sheet for nuclear fuel spacer grids”. In Metal and Materials International, vol. 18, No. 2, 2012, pp. 303-316.
[2] C. Poizat, L. Champagne, L. Daridon, L. Ahzi, C. Husson, and L. Merle, “Modeling and simulation of thin sheet blanking using damage and rupture criteria”. In International Journal of Forming Process, vol. 8, No.1, 2005, pp.29-47.
[3] A. L. Gurson, “Continuum theory of ductile rupture by void nucleation and growth. I. Yield criteria and flow rules for porous ductile media”. In Journal of Engineering Materials and Technology. vol. 99, No. 1, 1977, pp. 2-15.
[4] A. Needleman and V. Tvergaard, “An analysis of ductile rupture in notched bars”. In Journal of the Mechanics and Physics of Solids. vol. 32, No 6, 1984, pp. 461-490.
[5] ABAQUS user’s manual, Version 6.9, Dassault Systemes Simulia Corp., Providence, RI, USA, 2009.