Journal of High Pressure Institute of Japan
Online ISSN : 1347-9598
Print ISSN : 0387-0154
ISSN-L : 0387-0154
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Volume 25, Issue 5
Displaying 1-8 of 8 articles from this issue
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  • Trial of Recurrent Education on Maintenance Engineering
    Shukuji ASAKURA
    1987 Volume 25 Issue 5 Pages 231-250
    Published: September 25, 1987
    Released on J-STAGE: August 05, 2010
    DOIhttps://doi.org/10.11181/hpi1972.25.231
    JOURNAL FREE ACCESS
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    Recurrent education of maintenance engineering was examined in several ways at Yokohama National University. Variety of recurrent educations have been well developed in Europian countries and United States. Japanese Ministry of Education is devoting inself to the promotion of this educational system. The present trial conducted the following results.
    (1) The reccurent education is well accommodated with maintenance engineering.
    (2) Both governments and companies need it strongly.
    (3) The reccurent education in an engineering field seems to activate the cooperation among university, government, and company.
    (4) The attendants drastically increase when a course is served at a convenient location.
    (5) The educational impact is much larger than expected.
    (6) The reccurent education of maintenance engineering in a permanent form is highly requested in Japan.
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  • Application of Extreme Value Statistics for Backside Corrosion of Tank Bottom Plates (2nd Report)
    Tomikazu FUSHIMI, Jiro YOKOYAMA, Tetsuo IWAI
    1987 Volume 25 Issue 5 Pages 251-258
    Published: September 25, 1987
    Released on J-STAGE: August 05, 2010
    DOIhttps://doi.org/10.11181/hpi1972.25.251
    JOURNAL FREE ACCESS
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    The propriety to apply an extreme value statistics to the data of pitting corrosion which took place on oil storage tank bottom plates was discussed by the 1st report. The maximum pit depth from each sample fitted in with a doubly exponential distribution. And it was also confirmed that the result of statistical analysis was affected by the sample number and dimension.
    Therefore this report investigates the sampling method to estimate the Xmax (the maximum value of pit depth expected on all bottom plates) exactly and effectively. The result was that sampling from the weld joint and the stratified sampling were effective to improve the precision of the estimation in this tank.
    Ultrasonic thickness gauge was used to get the data of the maximum pit depth nondestructively. Measurement pitch was varied from 20mm to 5mm. Even though the measurement pitch was decreased to 5mm, most of the maximum pit depth obtained by the ultrasonic thickness gauge were smaller than those obtained by the depth gauge. About 1mm pitch is desired to obtain the maximum pit depth by use of the ultrasonic thickness gauge. In this case, it takes a lot of time to obtain the maximum pit depth from each sample, so this method is not practical.
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  • The Crack Initiation Behaviors of Fatigue-damaged High Strength Steels under Hydrogen Charging
    Kazuyoshi SEKINE, Shinzi EHARA
    1987 Volume 25 Issue 5 Pages 259-268
    Published: September 25, 1987
    Released on J-STAGE: August 05, 2010
    DOIhttps://doi.org/10.11181/hpi1972.25.259
    JOURNAL FREE ACCESS
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    This study is concerned with an attempt to establish the effects of fatigue damages on the initiation of cracks in high strength steels charged with hydrogen. The experiments were carried out on the notched specimens which were pre-fatigued to various numbers of cycle of loading with constant amplitudes, in order to examine the time to crack initiation at the tip of notch by means of static load tests under cathodic hydrogen-charging.
    The prior fatigue damage accumulation reduced significantly the time to hydrogen crack initiation at the notch tip of specimens. The possible mechanism for prior fatigue damage effects on hydrogen crack initiation in high strength steels was discussed in terms of the interactions between the hydrogens and microstructural defects within the cyclically plastic damage zone, such as hydrogen trapping due to dislocations and hydrogen segregations to microcracks.
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  • A Study on Sintered Diamond Composite (3)
    The Barrier Function of the Tantalum Foil
    Satoru HOSOMI, Akiko TAGUTHI
    1987 Volume 25 Issue 5 Pages 269-275
    Published: September 25, 1987
    Released on J-STAGE: August 05, 2010
    DOIhttps://doi.org/10.11181/hpi1972.25.269
    JOURNAL FREE ACCESS
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    In the manufacture of composites of sintered diamond and WC-Co support with a tantalum foil inserted between the two separate portions, the thin metallic layer serves to regulate the influx of molten metal inf iltrant to the diamond.
    For investigating the function, shortened sintering tests were conducted under high pressure-high temperature conditions.
    The results suggest that the tight structure of TaC, found on the WC-Co side of the foil contributes much to this function.
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  • [title in Japanese]
    1987 Volume 25 Issue 5 Pages 276-278
    Published: September 25, 1987
    Released on J-STAGE: August 05, 2010
    DOIhttps://doi.org/10.11181/hpi1972.25.276
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    1987 Volume 25 Issue 5 Pages 278-283
    Published: September 25, 1987
    Released on J-STAGE: August 05, 2010
    DOIhttps://doi.org/10.11181/hpi1972.25.278
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    1987 Volume 25 Issue 5 Pages 283-285
    Published: September 25, 1987
    Released on J-STAGE: August 05, 2010
    DOIhttps://doi.org/10.11181/hpi1972.25.283
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    1987 Volume 25 Issue 5 Pages 285-290
    Published: September 25, 1987
    Released on J-STAGE: August 05, 2010
    DOIhttps://doi.org/10.11181/hpi1972.25.285
    JOURNAL FREE ACCESS
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