All issues
Volume 43 (2005)
- Issue 6 Pages 320-
- Issue 5 Pages 254-
- Issue 4 Pages 190-
- Issue 3 Pages 130-
- Issue 2 Pages 64-
- Issue 1 Pages 4-
Predecessor
Volume 43, Issue 2
Displaying 1-5 of 5 articles from this issue
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Original Paper
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Katsumasa MIYAZAKI, Satoshi KANNO, Masayuki ISHIWATA, Naoki MIURA, Koi ...2005 Volume 43 Issue 2 Pages 64-74
Published: 2005
Released on J-STAGE: June 24, 2005
JOURNAL FREE ACCESSTo develop the simplified estimation method of crack extension in piping subjected to cyclic bending load with incremental amplitude, the pipe fracture tests were conducted in air at room temperature. In the simplified method, the J-integral, J was estimated by the failure assessment curve. Since the relationship between applied load and load line displacement was characterized as the elastic-fully plastic model, the cyclic J-integral range, ΔJ was formulated as 4Je (elastic part of J-integral) +2Jp (plastic part of J-integral) . The crack growth behaviors estimated by simplified method with crack growth property from constant amplitude tests showed good agreement with experimental results. Furthermore, the simplified method was applied to estimate the crack growth behavior in pipe fracture tests with 300A carbon steel pipe conducted in IPIRG study. Though the pipe fracture tests in IPIRG study were conducted at 300°C with high displacement rate, the estimation results by the simplified method were almost the same as the experimental results. This indicated that the proposed simplified method can estimate the crack extension in pipe subjected to cyclic bending load with incremental amplitude.View full abstractDownload PDF (524K) -
Takabumi FUKUDA, Taichi OFUCHI, Naoya KASAI, Kazuyoshi SEKINE, Shigeo ...2005 Volume 43 Issue 2 Pages 75-84
Published: 2005
Released on J-STAGE: June 24, 2005
JOURNAL FREE ACCESSThis paper concerns the statistical analysis of industrial accidents in order to assess the safety management system by highlighting the extreme events in large-scale accidents. The authors had proposed the use of risk curve to assess the performance of safety management systems and effects of safety measures for industries. Based on our previous studies, the authors investigate the application of the Frechet plot in order to predict the maximum magnitude in a certain period on condition that the safety management level is the same. Through the analysis with actual accidents data and series of percolate simulations, possibility to predict the expected maximum magnitude of accidents by applying the extreme value theory is shown. For the practical point of view, to evaluate the predictability of the expected damage loss with single risk curve is important. Therefore, distributions of the predicted maximum damages are observed. As the result, prediction for long term, such as 10 years, is impossible but this method might be applicable to the rough estimation for short term, such as 5 years. Through these considerations, it is demonstrated that the proposed methodology is applicable to assess the safety management level.View full abstractDownload PDF (452K) -
Masahiko NAKATANI, Shigemi SATO, Yasuyoshi KOBAYASHI, Kotoji ANDO2005 Volume 43 Issue 2 Pages 85-91
Published: 2005
Released on J-STAGE: June 24, 2005
JOURNAL FREE ACCESSStructural ceramics are brittle and sensitive to flaws. As a result, the structural integrity of a ceramic component may be seriously affected. A new technique to guarantee the reliability of ceramic components is demanded and so we proposed new technique [Crack-healing+Proof test]. For this technique, the mechanical behavior of the crack-healed zone is very important for the structural integrity. The equation has been derived based on process zone size failure criterion, which shows the temperature dependence of the proofed stress.
The main results obtained are as follows: (1) By crack-healing, the strength of ceramic coil spring increased and failure ratio by proof test was decreased. (2) Temperature dependence of proofed stress by proof test at room temperature was analyzed quantitatively as a function of proof stress and temperature. (3) The calculated temperature dependence of proofed stress showed excellent agreement with experimental one.View full abstractDownload PDF (271K) -
-Application of TOFD technique for butt weld joint of sidewall plate and Phased Array UT technique for fillet joint of annular plate-Masakazu KAMIBAYASHI, Akio DEGUCHI, Yoshichika WATANUKI, Hiroshi TAKAS ...2005 Volume 43 Issue 2 Pages 92-102
Published: 2005
Released on J-STAGE: June 24, 2005
JOURNAL FREE ACCESSRadiographic test (RT) has been applied to verify the soundness of weld joint of LNG storage tanks made of 9%Ni steel. But recent larger tanks require more radiation for RT to heavy thick plate such as sidewall at the lowest course, resulting in the increase of inspection time. In addition RT is less sensible of planar defects, which may reduce safety margins of strength and toughness, than ultrasonic test (UT) . Several UT techniques have been developed and expected to be rapid and reliable inspection with recordability through the recent advance of data processing.
In this paper these UT techniques were studied for the inspection of LNG storage tanks and the following conclusions were obtained. (1)TOFD technique identified the sizes of several kinds of defects with sufficient accuracy, being applicable to the inspection for the butt weld joint of sidewall plates instead of RT. (2)Phased array UT technique detected defects in the fillet joint connecting annular plate with sidewall plate at the lowest course, being expected as more reliable inspection, and further investigation will be necessary to apply this method to the actual tank.View full abstractDownload PDF (1470K)
Lecture
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-Brittle Fracture, Excessive Deformation, Instability•Buckling-Takuya SATO2005 Volume 43 Issue 2 Pages 111-120
Published: 2005
Released on J-STAGE: June 24, 2005
JOURNAL FREE ACCESSDownload PDF (250K)
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