Journal of High Pressure Institute of Japan
Online ISSN : 1347-9598
Print ISSN : 0387-0154
ISSN-L : 0387-0154
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Volume 41, Issue 5
Displaying 1-5 of 5 articles from this issue
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Original Paper
  • Fatigue Fracture Mechanism Maps for SUS304 Stainless Steel
    Megumi KIMURA, Koji YAMAGUCHI, Saburo MATSUOKA, Etsuo TAKEUCHI
    Article type: Original paper
    2003 Volume 41 Issue 5 Pages 216-223
    Published: 2003
    Released on J-STAGE: November 11, 2003
    DOIhttps://doi.org/10.11181/hpi.41.216
    JOURNAL FREE ACCESS
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    Fatigue fracture mechanism maps at room temperature and 300°C for SUS304 stainless steel were established by SEM observation of the fracture surface. Depending on the crack propagation rate ranging from 1x10-11 m⁄cycle to 1x10-6 m⁄cycle, three types of fracture surfaces were observed. One was crystallographic fracture region which was flat and dark by SEM observation, second was featureless fracture region which was rough and white, and third was striation region which was typical fatigue failure. Fraction of these regions in fracture surface depends on the crack propagation rate, so the fatigue fracture mechanism maps are useful for the fractography of the fatigue failure accidents.
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  • Methodology of Higher Fatigue Strength and Lighter weight of Connecting Rod for Diesel Engines
    Hirohito ETO, Katsuyuki MATSUI, Shinsaku FUKUDA, Kotoji ANDO
    Article type: Original paper
    2003 Volume 41 Issue 5 Pages 224-232
    Published: 2003
    Released on J-STAGE: November 11, 2003
    DOIhttps://doi.org/10.11181/hpi.41.224
    JOURNAL FREE ACCESS
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    To reduce weight of the Connecting Rod for diesel engines, it is needed to increase the fatigue strength of the Rod. For this purpose, a methodology to increase the strength of the Rod which is subject to the cyclic load of stress ratio R≤0 was proposed.
    That is 1) Increase the hardness of the Rod as high as possible. 2) Introduce the compressive residual stress, such as the sum of compressive residual and loaded stresses equals to the compressive yield stress, if, possible. 3) Obtain a fain grain size.
    Therefore, the authore made the material development for the high strength an process improvement of the Rod. As the result, the weight of the Rod 20% lighter than that of the conventional Rod.
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  • Relationship among specimen's hardness, residual stress distribution and yield stress on the difference of shot peening methods
    Hideki OKADA, Akira TANGE, Kotoji ANDO
    Article type: Original paper
    2003 Volume 41 Issue 5 Pages 233-242
    Published: 2003
    Released on J-STAGE: November 11, 2003
    DOIhttps://doi.org/10.11181/hpi.41.233
    JOURNAL FREE ACCESS
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    Shot peening technology plays a very important role in improving the fatigue strength of springs. Until now, many studies were carried out to make clear on relationship between shot peening and fatigue, or to estimate residual stress theoretically. In this paper, it investigated relationship among specimen's hardness, residual stress distribution and yield stress on the difference of shot peening methods. The material used was SUP9, and the hardness was from 308HV to 746HV, prepared by quenching and tempering. Shot peening methods used were single shot peening (SP), double shot peening (DSP), and stress double shot peening (SDSP) . The compressive residual stress obtained by shot peening tends to increase in proportion with increasing specimen's hardness. DSP has a large effect to increase the compressive residual stress of surface for the all hardness of specimen. It can be realized that SDSP can be obtained the deeper and larger compressive residual stress for the all hardness of specimen. The ratio of residual stress that can be obtained for yield stress of specimen is about 50%in case of SP and DSP, and is 83% in case of SDSP. Further it can be estimated that residual stress and yield stress become the same value in case of SDSP by simple tension.
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  • Research on repair weldability of petroleum pressure vessel
    Report 2 Evaluation of mechanical properties of repair weld and proposal of repair welding guideline.
    Rinzo KAYANO, Tatsuo HASEGAWA, Hirokazu INOUE
    Article type: Original paper
    2003 Volume 41 Issue 5 Pages 243-251
    Published: 2003
    Released on J-STAGE: November 11, 2003
    DOIhttps://doi.org/10.11181/hpi.41.243
    JOURNAL FREE ACCESS
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    In previous report, authors simulated actual pressure vessel repair weld exposed at high temperature and high pressure hydrogen by using large size test specimen which exceeds 100mm thickness. In this paper, we confirmed mechanical properties of repair weld which temper embrittlement susceptibility was different by using 2. 25Cr-1Mo steel test specimens of two kinds of chemical composition. And we examined the effect of the temper embrittlement on the serviceability after repair welding. Next, the possibility of PWHT omission after repair welding was verified by the measurement of the residual stress. Finally, repair welding guideline was proposed including these test results.
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