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 28, Issue 5
Displaying 1-5 of 5 articles from this issue
Show all abstracts
    • |<
    • <
    • 1
    • >
    • >|
  • Evaluation of Fracture Toughness in Si3N4
    Bu-ahn KIM, Shinichi MEGURO, Kotoji ANDO, Nobukazu OGURA
    1990 Volume 28 Issue 5 Pages 218-228
    Published: September 25, 1990
    Released on J-STAGE: August 05, 2010
    DOIhttps://doi.org/10.11181/hpi1972.28.218
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    Many studies about the characteristics of fracture strength and fracture toughness for ceramics are conducted based on linear facture mechanics. But, the evaluation method of reliability of ceramics is not well estabilished.
    Meanwhile, numerous microcracks and phase transformation are formed ahead of the crack tip of ceramics. That is called “process zone”. This process zone toughen a material by microcrack or stress shielding mechanism.
    In this study, authors examined the relation of equivalent crack length and fracture strength based on proposed failure criterion model. And analized the characteristics of reliability of the fracture stress and fracture toughness by using Weibull distribution. Lastly, authors propose a new failure assessment diagram based on both probability concept and process zone size failure criterion.
    View full abstract
    Download PDF (3911K)
  • Evaluation of Strength on Stud Shear Connector with Fuzzy Set Theory
    Kazuyoshi MATSUOKA
    1990 Volume 28 Issue 5 Pages 229-238
    Published: September 25, 1990
    Released on J-STAGE: August 05, 2010
    DOIhttps://doi.org/10.11181/hpi1972.28.229
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    Studs are primarily used as shear connectors in composite structures. The load carrying capacities of studs are determined with push-out tests. The test results are scattered about, even in the same batch of tests; in an extreme case, the minimum capacity is smaller than one half of the maximum. In the case of the same stud and the same concrete, the standard deviation of the material strength is very small, so it is not thougth that the scatter is caused by materials. And the scatter is to be caused by the uncertainty of the collapse mechanism. In this paper, three collapse modes, which are crush of concrete, pull out of stud, and ductile fracture of stud, are delt with. Three Fuzzy sets which express the collapse strengths of these three modes are made up. With these Fuzzy sets, the load carrying capacities are discussed.
    View full abstract
    Download PDF (988K)
  • Standardization for Production Test of Tension on Steel Butt-Welding Fittings
    Morihiro HAYASHI, Hitoshi MASUKO, Hiromu OHNO, Koji HOSOKAWA, Tsuneshi ...
    1990 Volume 28 Issue 5 Pages 239-247
    Published: September 25, 1990
    Released on J-STAGE: August 05, 2010
    DOIhttps://doi.org/10.11181/hpi1972.28.239
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    As there are various demands on steel butt-welding pipe fitting according to intended applications, the relevant JIS B 2312 and B 2313 incorporate special quality requirements, which shall be applied in case request is placed in advance by the order. These requirements include a tensile test to be performed on a specimen sampled form an actual product of pipe fittings-called hereafter the production test of tension. Because a pipe fittings is in three-dimensional form, sampling a tensile test specimen from pipe fitting requires a flattening process of the sampled specimen prior to its machining, and this flattening process may drop the yield strength because of Bauschinger effect.
    This paper is to put the standardization of this production test of tension on pipe fittings in practice in view of preventing Bauschinger effect likely in the flattening process of sampled specimen.
    View full abstract
    Download PDF (761K)
  • Generation of False Signal in Eddy Current Testing on Austenitic Stainless Cast Steel
    Osamu YOKOTA, Hiroshi DOHI, Yugoro ISHII
    1990 Volume 28 Issue 5 Pages 248-256
    Published: September 25, 1990
    Released on J-STAGE: August 05, 2010
    DOIhttps://doi.org/10.11181/hpi1972.28.248
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    On inspection of casting or weld of austenitic stainless steel, an abnormal image is frequently observed on radiographs and high noise level and remakable attenuation of ultrasonic waves are indicated by ultrasonic testing. These causes have been well known in a long time, and number of reports have been published from various points of view for these causes, recently.
    On the other hand, it is found experimentally that false signals were generated by eddy current testing for the measurement of austenitic stainless steel casting. But this study has yet been any other reports.
    In this study, test frequencies of 8kHz, 32kHz and 128kHz are applied. The castings of austenitic stainless steel and aluminum are used as test pieces.
    False signals are not due to any test frequencies. Neither, they are not generated on aluminum casting. It has been experimentally verified that these false signals are caused mainly by the presence of δ-ferrite and the segregation of chemical elements.
    View full abstract
    Download PDF (7032K)
  • Thermoelastic Determination of Stress Intensity Factors for Toe Cracks in Fillet Welded Joints and Comparison with Finite Element Results
    S. W. K. Chan, P. J. Tubby, Hajime INOUE
    1990 Volume 28 Issue 5 Pages 257-268
    Published: September 25, 1990
    Released on J-STAGE: August 05, 2010
    DOIhttps://doi.org/10.11181/hpi1972.28.257
    JOURNAL FREE ACCESS
    Download PDF (4024K)
    • |<
    • <
    • 1
    • >
    • >|
feedback
 Top