Journal of High Pressure Institute of Japan
Online ISSN : 1347-9598
Print ISSN : 0387-0154
ISSN-L : 0387-0154
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Volume 51, Issue 6
Displaying 1-5 of 5 articles from this issue
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Original Paper
  • Pressure Cycle Life Prediction of Type III FRP Pressure Vessel
    Nobuhiro YOSHIKAWA, Kouta HARIYA, Takeshi YOSHIDA, Katsuya SATO, Hiroy ...
    2013 Volume 51 Issue 6 Pages 298-302
    Published: November 25, 2013
    Released on J-STAGE: December 17, 2013
    DOIhttps://doi.org/10.11181/hpi.51.298
    JOURNAL FREE ACCESS
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    A design diagram to predict cycle life to leak is proposed for Type III composite pressure vessels taking account of mean stress shift caused by autofrettage. We have conducted pressure cycle tests by employing Type III vessels of 2. 0 L specially designed to realize various combinations of stress range and the maximum stress, which are exactly evaluated by means of the finite element simulations. Revealing low advantage of autofrettage for high cycle fatigue life, we derive fatigue life prediction diagram in terms of stress range and the maximum stress of A6061-T6 liner over 100000 cycles life.
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  • Fatigue Strength of Notched Specimen of Machinable C⁄C Composites
    Chobin MAKABE, Masaki FUJIKAWA, Md. Shafiul FERDOUS, Sofyan Arief SETY ...
    2013 Volume 51 Issue 6 Pages 303-311
    Published: November 25, 2013
    Released on J-STAGE: December 17, 2013
    DOIhttps://doi.org/10.11181/hpi.51.303
    JOURNAL FREE ACCESS
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    The fatigue strengths in notched specimens of C⁄C composites were investigated. The plate of C⁄C composites using fine-woven carbon fiber laminates with =0⁄90°direction was used for testing. The phenomenon of crack growth behavior and the shear damage in the fiber bundle was discussed. Slits of several sizes were cut on both sides of a test section and different sizes of slit length were chosen. Also, specimen with blunt-notches was used to compare the fatigue strength. The weakest fatigue limit was obtained in the case of specimens with blunt-notch. However, the stress concentration factor of that is smaller than that of slit specimens. The relationships between fatigue strengths and specimen shapes were analyzed by stress distribution and stress intensity factor,kI. The effect of slit configuration on fatigue strength was then discussed regarding both the experimental and calculated consequences. Consequently, it was discussed that fatigue strength of present specimens was determined depending on the damage conditions in the vicinity of notch and on the crack initiation behavior.
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  • Evaluation of hydrogen influence on plastic deformation behavior of ferritic low alloy steels by the nano-indentation method
    Nobuo NAGASHIMA, Masao HAYAKAWA
    2013 Volume 51 Issue 6 Pages 312-321
    Published: November 25, 2013
    Released on J-STAGE: December 17, 2013
    DOIhttps://doi.org/10.11181/hpi.51.312
    JOURNAL FREE ACCESS
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    The influences of hydrogen on nano-indentation testing of IF and STPG370 steels before and after the hydrogen charging were investigated. The ”pop-in” behavior was observed in the nano-indentation force-penetration depth (F-h) curves. The force at pop-in (Fpop-in) was obtained in the uncharged specimens. But the behavior was not observed in the hydrogen charged specimens. It is cleared that hydrogen enhances initial plastic deformation in the nano scale regions. After 473K⁄1h heat treated with hydrogen charged the IF steel, however, hydrogen recharged the sample occurred pop-in. It is suggested that vacancy of hydrogen trap site became extinct by heat-treatment of473K.
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Review
  • Installation of an Internal Floating Roof in a Fixed Roof Tank for Oil Storage
    Shoichi YOSHIDA
    2013 Volume 51 Issue 6 Pages 322-333
    Published: November 25, 2013
    Released on J-STAGE: December 17, 2013
    DOIhttps://doi.org/10.11181/hpi.51.322
    JOURNAL FREE ACCESS
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    The oil refinery and petrochemical industry is dedicated to continuous efforts to improve the compatibility of their operations with the health, safety and environment while economically developing high quality products and services to consumers. The installation of an internal floating roof in an existing fixed roof tank for oil storage is the most effective solution for reducing evaporative emission. The aluminum internal floating roofs (AIFR) have been in service since 1950s. Now many AIFR are used in aboveground oil storage tanks all over the world. This paper describes new technologies of AIFR. These are the heavy duty skin and pontoon type, the cable suspended type, the GRP sandwith panel type and the rigid frame hollow panel type.
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