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research-article

Experimental study on the deformation and failure of the bellows structure beyond the designed internal pressure

[+] Author and Article Information
Masanori Ando

Japan Atomic Energy Agency, Shiraki 1, Tsuruga, Fukui, 919-1279 Japan
ando.masanori@jaea.go.jp

Hiroki Yada

Japan Atomic Energy Agency, Shiraki 1, Tsuruga, Fukui, 919-1279 Japan
yada.hiroki@jaea.go.jp

Kazuyuki Tsukimori

Japan Atomic Energy Agency, Shiraki 1, Tsuruga, Fukui, 919-1279 Japan; University of Fukui, Kanawa 1-2-4, Tsuruga, Fukui, 914-0055 Japan
tsukimor@u-fukui.ac.jp

Masakazu Ichimiya

University of Fukui, Kanawa 1-2-4, Tsuruga, Fukui, 914-0055 Japan
ichimiya@u-fukui.ac.jp

Yoshinari Anoda

University of Fukui, Kanawa 1-2-4, Tsuruga, Fukui, 914-0055 Japan
anoda@u-fukui.ac.jp

1Corresponding author.

ASME doi:10.1115/1.4037564 History: Received June 01, 2017; Revised August 03, 2017

Abstract

Bellows structure is used to absorb the thermal expansion maintaining the boundary of the inside to outside, and it is applied to constitute the containment vessel boundary of the nuclear power plant. In this study, in order to develop the evaluation method of the ultimate pressure of the bellows structure subject to the internal pressure beyond the specified, the failure test and finite element analysis (FEA) of the bellows structure were performed. The failure modes were demonstrated through the test of five and six specimens with six and five convolutions, respectively. Water leakage was caused by contact of the expanded convolution and the neighbor structure in the specimens with the shipping rod mounts. On the other hand, local failure and ductile failure were observed in the specimen without shipping rod mounts. The maximum pressures in the test observed local and ductile failure were over 10 times larger than the estimated values of the limited design pressure for in-plane instability by the EJMA standard. To simulate the buckling and deformation behavior during the test, the implicit and explicit analyses were performed. Because the inversion of the convolution accompanied convolution contact observed in the test was too difficult problem for implicit analysis, the maximum pressures in the step of solution converged were compared to the maximum pressures in the tests. On the other hand, explicit analysis enabled to simulate the complex deformation during the test and the results were evaluated considering ductile failure to compare the test results.

Copyright (c) 2017 by ASME
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