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Damage Observations of the Straight Pipes Subjected to Cyclic Load Amplitudes of Various Levels

[+] Author Affiliations
Izumi Nakamura

National Research Institute for Earth Science and Disaster Prevention, Tsukuba, Ibaraki, Japan

Akihito Otani

IHI Corporation, Yokohama, Kanagawa, Japan

Masaki Shiratori

Yokohama National University, Yokohama, Kanagawa, Japan

Paper No. PVP2010-25495, pp. 897-904; 8 pages
doi:10.1115/PVP2010-25495
From:
  • ASME 2010 Pressure Vessels and Piping Division/K-PVP Conference
  • ASME 2010 Pressure Vessels and Piping Conference: Volume 1
  • Bellevue, Washington, USA, July 18–22, 2010
  • Conference Sponsors: Pressure Vessels and Piping Division
  • ISBN: 978-0-7918-4920-0 | eISBN: 978-0-7918-3878-5
  • Copyright © 2010 by ASME

abstract

Fatigue failure accompanied by ratchet deformation is well known as one of the failure modes of pressurized pipes under high-stress level cyclic load. In this research, the process of failure of such pipes was investigated based on the experimental result in which a straight pipe failed by increasing cyclic input of displacement amplitude step-by-step. The strain behavior, moment-deflection relationship, and observed damage were compared with the stress levels prescribed in the seismic design of the piping system in Japan. As a result, no significant damage was observed and the moment-deflection relationship remained almost linear within the primary stress limit of 3Sm , although the strains at some measurement points reached to the plastic region. In the experiment, damage was observed at the applied load level of approximately 5Sm of the primary stress level, and 0.15 and more of the fatigue damage index, i.e., the usage factor based on the design. The test results showed that there is several times as much margin as its designed stress limitation before failure occurs to actual piping systems.

Copyright © 2010 by ASME
Topics: Stress , Pipes

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