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Research Papers: Materials and Fabrication

Research and Development of Rubber Bearings for Sodium-Cooled Fast Reactor: Ultimate Properties of Half-Scale Thick Rubber Bearings Based on Breaking Tests

[+] Author and Article Information
Tsuyoshi Fukasawa

Mitsubishi FBR Systems,
2-34-17, Jingumae,
Tokyo 150-0001, Shibuya-ku, Japan
e-mail: tsuyoshi_fukasawa@mfbr.mhi.co.jp

Shigeki Okamura

Mitsubishi FBR Systems,
2-34-17, Jingumae,
Tokyo 150-0001, Shibuya-ku, Japan
e-mail: shigeki_okamura@mfbr.mhi.co.jp

Tomohiko Yamamoto

Japan Atomic Energy Agency,
4002, Narita-cho,
Oarai-machi 311-1393, Ibaraki, Japan
e-mail: yamamoto.tomohiko@jaea.go.jp

Nobuchika Kawasaki

Japan Atomic Energy Agency,
4002, Narita-cho,
Oarai-machi 311-1393, Ibaraki, Japan
e-mail: kawasaki.nobuchika@jaea.go.jp

Tsutomu Hirotani

Shimizu Corporation,
2-16-1, Kyobashi,
Chuo-ku 104-8370, Tokyo, Japan
e-mail: hirotani@shimz.co.jp

Eriko Moriizumi

Shimizu Corporation,
2-16-1, Kyobashi,
Chuo-ku 104-8370, Tokyo, Japan
e-mail: eriko.moriizumi@shimz.co.jp

Yu Sakurai

Bridgestone Corporation,
1, Kashio-cho, Totsuka-ku,
Yokohama 244-8510, Kanagawa, Japan
e-mail: yu.sakurai@bridgestone.com

Nobuo Masaki

Bridgestone Corporation,
1, Kashio-cho, Totsuka-ku,
Yokohama 244-8510, Kanagawa, Japan
e-mail: nobuo.masaki@bridgestone.com

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received September 2, 2016; final manuscript received November 6, 2017; published online November 30, 2017. Assoc. Editor: David L. Rudland.

J. Pressure Vessel Technol 140(1), 011401 (Nov 30, 2017) (11 pages) Paper No: PVT-16-1160; doi: 10.1115/1.4038435 History: Received September 02, 2016; Revised November 06, 2017

This paper describes the results of static loading tests using a half-scale thick rubber bearing to investigate ultimate properties application for a sodium-cooled-fast-reactor (SFR). Thick rubber bearings which have a rubber layer that is roughly two times thicker in comparison with existing rubber bearings have been developed by the authors to ensure seismic safety margins for components installed in the reactor building, and to reduce the seismic response in the vertical direction as well as the horizontal direction. The thick rubber bearings, 1600 mm in diameter at the full scale, have been designed to provide a rated load of about 10,000 kN, at the compressive stress of 5.0 MPa, with a horizontal natural period of 3.4 s and a vertical natural period of about 0.133 s. The restoring-force characteristics, including variations, and breaking points, for the thick rubber bearings have not been cleared yet. These validations are essential from the point of view of probabilistic risk assessment (PRA) for a base-isolated nuclear plant as well as a verification of the structural integrity of the thick rubber bearings. The purpose of this paper is to indicate the variation of the stiffness and damping ratios for restoring force characteristics, and the breaking strain or stress, as ultimate properties through static loading tests using half-scale thick rubber bearings. In addition, an analytical model for the thick rubber bearings which is able to express the nonlinear restoring force, including the breaking points, is presented.

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References

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Figures

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Fig. 1

Rubber bearing of half-scale model

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Fig. 2

Test machine for static loading tests

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Fig. 3

Dimensions of test machine used for static tests

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Fig. 4

Variation of the stiffness and damping

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Fig. 5

Skeleton curves and linear shear strain limits

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Fig. 6

Deformation by shear loading: (a) deformation Immediately before breaking and (b) deformation after breaking

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Fig. 7

Hysteresis loops in compressive regions

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Fig. 8

Skelton curves in tensile regions

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Fig. 9

Deformation by tensile loading: (a) offset shear strain of 0% (simple tensile loading) and (b) offset shear strain of 300%

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Fig. 10

Hysteresis loops in tensile regions

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Fig. 11

Hysteresis loops under simultaneous loading

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Fig. 12

Breaking surfaces for thick rubber bearings

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Fig. 13

Modified macroscopic model

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Fig. 14

Axial-restoring force characteristic

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