Journal of High Pressure Institute of Japan
Online ISSN : 1347-9598
Print ISSN : 0387-0154
ISSN-L : 0387-0154
Search
Advanced search
OR
Browse
Search
Volume 30, Issue 5
Displaying 1-7 of 7 articles from this issue
Show all abstracts
    • |<
    • <
    • 1
    • >
    • >|
  • Effect of Pre-Loading on Fracture Toughness
    Hiroshi MIMURA, Manabu YAGI
    1992 Volume 30 Issue 5 Pages 236-240
    Published: September 25, 1992
    Released on J-STAGE: August 05, 2010
    DOIhttps://doi.org/10.11181/hpi1972.30.236
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    An effect of per-loading on fracture toughness was studied by using a three-point bending test method on a steel of 50kgf/mm2 strength. Results are summerized as follows.
    (1) In the case of low fracture toughness, preloading gave little influence on the critical COD, so that preloading is beneficial to safety.
    (2) In the case of high fracture toughness, perloading made the critical COD decrease by the nearly same amount as COD produced by preloading. Preloading is not necessarily beneficial.
    A possible mechanism was discussed as to why preloading gives the effect on the critical COD.
    View full abstract
    Download PDF (505K)
  • Residual stress evaluation of coating films using Welding residual stress and deformation analysis system
    Yoshiyasu ITOH, Kiyotaka TANAKA, Masashi TAKAHASHI, Takatsugu OKADA, M ...
    1992 Volume 30 Issue 5 Pages 241-248
    Published: September 25, 1992
    Released on J-STAGE: August 05, 2010
    DOIhttps://doi.org/10.11181/hpi1972.30.241
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    A computer-aided interactive system of named WRED (Welding REsidual stress and Deformation analysis system) had been developed, which enables the structural designer and manufacturing engineer to conveniently analyze residual stresses and deformations of various structural components. In this paper, the residual stress characteristics of ceramic coated components prepared by some processes were studied using the WRED system. The residual stresses are calculated by elastic analysis using a concept of inherent strain. The experimental results for CVD (chemical vapor deposition) coating process are in good agreement with the calculated results by the WRED system. However, the experimental results for PVD (physical vapor deposition) coating process and plasma spraying process can not be always estimated by the WRED system. Also, the stress relaxation characteristics of graded coatings are investigated for the effect of number of graded layers.
    View full abstract
    Download PDF (3655K)
  • Development of Belt Type High Pressure Apparatus for Material Synthesis at -8 GPa
    Shinobu YAMAOKA, Minoru AKAISHI, Hisao KANDA, Toshikazu OSAWA, Takashi ...
    1992 Volume 30 Issue 5 Pages 249-258
    Published: September 25, 1992
    Released on J-STAGE: August 05, 2010
    DOIhttps://doi.org/10.11181/hpi1972.30.249
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    The ‘belt’ type high pressure apparatus, which has widely been used industrially for the synthesis of diamond and cBN in the pressure and temperature ranges of about 6 GPa and 1600°C, was modified to increase the pressure and temperature to the regions of 8 GPa and above 2000°C for the routine experiments of the new synthesis research on diamond and cBN. This was realized by adopting the optimum values of the shape parameters in the central parts of the apparatus and the press fitting conditions. An apparatus with the bore diameter of 30mm was constructed and used successfully in more than 600 runs for the synthesis, crystal growth and sintering of diamond and cBN in the 8 GPa pressure region.
    View full abstract
    Download PDF (3167K)
  • Thickness Measurements of Zircaloy Fuel Cladding Tube having the Surface Oxide Layer by Ultrasonic Signal Processing
    Kazuyoshi SEKINE, Shigeto KUNITOMO, Renzhong YIN, Noriyuki SAKAGUCHI
    1992 Volume 30 Issue 5 Pages 259-266
    Published: September 25, 1992
    Released on J-STAGE: August 05, 2010
    DOIhttps://doi.org/10.11181/hpi1972.30.259
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    The purpose of this study is to develop an ultrasonic method for measuring the actual thickness of zircaloy-2 alloy tube with the thin surface oxide layer using a high frequency broadband foccused transducer which can produce a short-duration echo.
    The main algorithm of signal processing technique for thickness measurements deals with the problem for separating of echoes very close to each other and calculating of the propagation time between these two echoes by using the cross-correlation method. A computer-implemented ultrasonic method based on this algorithm was established in this study. The results of thickness measurement in metal-wall of zircaloy tubes which were artificially plasma-sprayed with ZrO2 were presented. The comparision of ultrasonically measured thickness with the metallographically determined ones showed that the proposed method has a reasonable accuracy for the measurements of actual thin metal-wall thickness in the oxided zircaloy tubes.
    View full abstract
    Download PDF (817K)
  • Development of New Type Gas Holder with High Reliability (3)
    Strength Verification under Seismic Loads
    Haruhiko IIZUKA, Hiroshi MAKUTA, Akio DEGUCHI, Katsuji KAWANA
    1992 Volume 30 Issue 5 Pages 267-276
    Published: September 25, 1992
    Released on J-STAGE: August 05, 2010
    DOIhttps://doi.org/10.11181/hpi1972.30.267
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    In recent years gas holders have become larger in capacity and higher in pressure in order to use the gases which are accompanied in the steel/manufacturing processes effectively. So the strength under seismic loads has been one of the key probrems of the structure, which are constructed on soft ground.
    This paper shows the structural verification under seismic loads by taking the interaction of soil and structure into consideration.
    The following conclusions are obtained.
    (1) The maximum axial force of stanchions during the dynamic response which interacts the soil foundation is estimated to be smaller than that of the static acceleration method stipulated by normal rules.
    (2) A small plastic deformation which may occur at the base of the stanchions under large seismic loads reduces the dynamic response of the whole structure and keeps a safety margin of structural endurance.
    View full abstract
    Download PDF (886K)
  • The recent trend of the international standards about “Bursting discs and bursting disc devices”
    Ikuso Omyo
    1992 Volume 30 Issue 5 Pages 277-282
    Published: September 25, 1992
    Released on J-STAGE: August 05, 2010
    DOIhttps://doi.org/10.11181/hpi1972.30.277
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    Since 1979, ISO/DIS 6718, “Busrting discs and bursting disc devices” had been discussed in ISO/TC 153/SC 3/WG 3 and TC 185/SC 2, and it was published in 1985 as “First edition-1985-09-01”.
    Many proposals were submitted by member countries after that time, and ISO/TC 185/SC 2 has been discussing them every year.
    This report is written about the recent trends of their resolutions, the relation of JIS B 8226, “Bursting discs and bursting disc devices” and future problems etc.
    View full abstract
    Download PDF (665K)
  • [title in Japanese]
    Washiro SANO
    1992 Volume 30 Issue 5 Pages 283-288
    Published: September 25, 1992
    Released on J-STAGE: August 05, 2010
    DOIhttps://doi.org/10.11181/hpi1972.30.283
    JOURNAL FREE ACCESS
    Download PDF (700K)
    • |<
    • <
    • 1
    • >
    • >|
feedback
 Top