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An Evaluation Method for Plastic Buckling of Cantilever Type Pipes Controlled by Displacement Loads: Part 2—Verification of Proposal Method by Buckling Test

[+] Author Affiliations
Masanori Ando, Nobuchika Kawasaki, Kazuyuki Tsukimori

Japan Atomic Energy Agency, Ibaraki, Japan

Taiji Tezuka, Toshio Nakamura

Mitsubishi Heavy Industries, Ltd., Nagasaki, Japan

Tomohiro Okawa

Mitsubishi Heavy Industries, Ltd., Hyogo, Japan

Yasuhiro Enuma

Mitsubishi FBR Systems, Inc., Tokyo, Japan

Paper No. PVP2011-57548, pp. 243-250; 8 pages
doi:10.1115/PVP2011-57548
From:
  • ASME 2011 Pressure Vessels and Piping Conference
  • Volume 3: Design and Analysis
  • Baltimore, Maryland, USA, July 17–21, 2011
  • Conference Sponsors: Pressure Vessels and Piping Division
  • ISBN: 978-0-7918-4453-3
  • Copyright © 2011 by ASME

abstract

In Fast Breeder Reactors, dominant stresses in the system are secondary, which are induced by constraint of the thermal expansion of components and pipes. Therefore, the structural design rule should essentially prevent the buckling caused by displacement-controlled loads. In this paper the applicability of the estimation method of buckling criterion, which was proposed by the authors on the basis of a series of Finite Element Analysis (FEA), was confirmed by carrying out a series of buckling tests. The displacement-controlled buckling tests were performed with cantilever type pipes made of Mod.9Cr-1Mo steel at room temperature and at 550°C. A visual measurement using image processing was applied to clarify both deformation profile and strain distribution at the local buckling portion of pipes. FEA was used in advance for estimating the buckling behavior of tests, such as load-displacement relationship, deformation profile and longitudinal strain distribution. Comparison between test and FEA results showed that buckling behaviors in the tests are predictable by FEA. The estimation method of buckling criterion on the basis of FEA was found to conservatively cover the test results, and we can conclude that this estimation method can be adopted for designing the piping systems of Fast Breeder Reactors.

Copyright © 2011 by ASME

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