General components such as pressure vessels, piping, storage tanks, and so on are designed in accordance with the construction codes based on the assumption that there are no flaws in such components. There are, however, numerous instances in which in-service single or multiple volumetric flaws such as local thin areas are found in the equipment concerned. Therefore, it is necessary to establish a fitness for service rule, which is capable of evaluating these flaws. The procedure for a single flaw or multiple flaws has recently been proposed for assessing the flaws in the (pressure-moment) diagram, which is an easy way to visualize the status of the component with flaws simultaneously subjected to internal pressure and external bending moment due to earthquake, etc. If the assessment point lies inside the line, the component with flaws is judged to be safe. In this paper, numerous experiments and finite element analysis for a cylinder with external multiple volumetric flaws were conducted under (1) pure internal pressure, (2) pure external bending moment, and (3) subjected simultaneously to both internal pressure and external bending moment, in order to determine the plastic collapse load at volumetric flaws by applying the twice-elastic slope (TES) as recommended by ASME. It has been clarified that the collapse (TES) loads are much the same as those calculated under the proposed line based on the measured yield stress.
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e-mail: konosu @ mx.ibaraki.ac.jp
e-mail: kano-mst@smt-co.com
e-mail: mukaimachi.norihiko@jgc.co.jp
e-mail: kanamaru.shinichiro@jgc.co.jp
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April 2010
Research Papers
Validity of Assessment Procedure in Method for Multiple Volumetric Flaws
Shinji Konosu,
e-mail: konosu @ mx.ibaraki.ac.jp
Shinji Konosu
Ibaraki University
, 4-12-1 Nakanarusawa, Hitachi, Ibaraki 316-8511, Japan
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Masato Kano,
e-mail: kano-mst@smt-co.com
Masato Kano
Sumitomo Metal Technology, Inc.
, 16-1 Sunayama, Kamisu, Ibaraki 314-0255, Japan
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Norihiko Mukaimachi,
e-mail: mukaimachi.norihiko@jgc.co.jp
Norihiko Mukaimachi
JGC Corporation
, 2-3-1 Minatomirai, Nishiku, Yokohama 220-6001, Japan
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Shinichiro Kanamaru
e-mail: kanamaru.shinichiro@jgc.co.jp
Shinichiro Kanamaru
JGC Corporation
, 2-3-1 Minatomirai, Nishiku, Yokohama 220-6001, Japan
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Shinji Konosu
Ibaraki University
, 4-12-1 Nakanarusawa, Hitachi, Ibaraki 316-8511, Japane-mail: konosu @ mx.ibaraki.ac.jp
Masato Kano
Sumitomo Metal Technology, Inc.
, 16-1 Sunayama, Kamisu, Ibaraki 314-0255, Japane-mail: kano-mst@smt-co.com
Norihiko Mukaimachi
JGC Corporation
, 2-3-1 Minatomirai, Nishiku, Yokohama 220-6001, Japane-mail: mukaimachi.norihiko@jgc.co.jp
Shinichiro Kanamaru
JGC Corporation
, 2-3-1 Minatomirai, Nishiku, Yokohama 220-6001, Japane-mail: kanamaru.shinichiro@jgc.co.jp
J. Pressure Vessel Technol. Apr 2010, 132(2): 021402 (10 pages)
Published Online: January 29, 2010
Article history
Received:
April 10, 2009
Revised:
September 16, 2009
Online:
January 29, 2010
Published:
January 29, 2010
Citation
Konosu, S., Kano, M., Mukaimachi, N., and Kanamaru, S. (January 29, 2010). "Validity of Assessment Procedure in Method for Multiple Volumetric Flaws." ASME. J. Pressure Vessel Technol. April 2010; 132(2): 021402. https://doi.org/10.1115/1.4000507
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