A Reduction Algorithm of Contact Problems for Core Seismic Analysis of Fast Breeder Reactors
Ryuta Imai; Masatoshi Nakagawa

Source CMES: Computer Modeling in Engineering & Sciences, Vol. 84, No. 3, pp. 253-282, 2012
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Keywords reduction method, contact algorithm, core seismic analysis, Lagrange multiplier for constraints
Abstract In order to evaluate seismic response of fast breeder reactors, finite element analysis for core vibration with contact/impact is performed so far. However a full model analysis of whole core vibration requires huge calculation times and memory sizes. In this research, we propose an acceleration method of reducing the number of degrees of freedom to be solved until converged for nonlinear contact problems. Furthermore we show a sufficient condition for the algorithm to work well and discuss its efficiency and a generalization of the algorithm. In particular we carry out the full model analysis to show that our method can decrease calculation time dramatically.
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