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Volume 50, Issue 1
Displaying 1-5 of 5 articles from this issue
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Original Paper
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Part 2 Local FailureAtsushi OHNO, Takuyo KAIDA2012 Volume 50 Issue 1 Pages 4-15
Published: January 25, 2012
Released on J-STAGE: August 07, 2012
JOURNAL FREE ACCESSThe Fitness-For-Service (FFS) assessment procedure based on stress analysis provides the most detailed evaluation which produces results that are more accurate than the other procedures using screening criteria or assessment diagram. In Japan, the concern with the detailed evaluation of metal loss has been growing. For the actual application, it is necessary to clear the safety margin of FFS assessment results using stress analysis. There has, however, been little study to compare between actual burst pressure of cylindrical shell with metal loss and the FFS assessment results using finite element method (FEM) . ＜br＞In this study, the allowable pressure limits against local failure for a cylindrical shell with local metal loss were evaluated using FEM, and compared with actual burst test results. Additionally, individual variation of the FEM results was evaluated in the FFS standard committee, which consists of the Petroleum Association of Japan and the Japan Petrochemical Industry Association. Finally, the detailed FEM procedure including how to select element types for accurate assessment was proposed. ＜br＞By using the proposed procedure, the allowable pressure limits for local collapse calculated by the committee members varied within 5% of the safety margin.View full abstractDownload PDF (2703K) -
Takashi NAGAYA, Tetsuya MATSUI2012 Volume 50 Issue 1 Pages 16-23
Published: January 25, 2012
Released on J-STAGE: August 07, 2012
JOURNAL FREE ACCESSShaking table tests are carried out to investigate the sloshing in a cylindrical oil storage tank with a single-deck type floating roof. The experimental tank is a stainless-steel cylinder of 1, 600mm in diameter with a floating roof composed of an inner deck made of polyvinyl chloride sheet and an outer pontoon made of acrylic plate. The optical motion capture system is employed to measure the roof displacement over the whole roof surface. Free oscillation tests as well as seismic oscillation tests are performed using the 2003 Tokachioki earthquake recorded at Tomakomai K-Net station. It is observed that the nonlinear oscillation modes with the number of circumferential waves 0, 2 and 3 may occur, which cannot be predicted by the linear theory.View full abstractDownload PDF (886K) -
MD. Shafiul FERDOUS, Shotaro FUJITA, YAMAUCHI Akihiro, Chobin MAKABE2012 Volume 50 Issue 1 Pages 24-32
Published: January 25, 2012
Released on J-STAGE: August 07, 2012
JOURNAL FREE ACCESSWhen an overload was applied during fatigue crack growth test with constant stress amplitude under negative stress ratio, not only the retardation but also the acceleration of the crack growth was occurred, depending on the experimental conditions. In the present study the acceleration behavior of crack growth after overload was investigated and the method of improving the crack growth behavior of that was investigated. Where the cyclic stress level was higher than a critical level and the overload level was also higher than a critical level, the crack growth rate after overloading was kept higher level than the baseline which is crack growth rate of specimen without applying of overload. It is considered from the experimental results that the crack growth acceleration was caused by the tensile residual stress distribution in front of the crack tips. Therefore, it was discussed that removing the overload plastic zone in front of the crack tips would be effective to improve crack growth behavior of the overloaded specimen. Then the effect of drilling stop-holes at crack tips or in the vicinity of crack tips on crack growth was investigated. The crack growth behavior of the overloaded specimen where stop-holes were drilled and pins inserted into them was compared with that of the base which was obtained by using a specimen without stop-holes. In the case where the stop-holes were drilled, the crack growth behavior of the overloaded specimen was not improved. However, the crack growth behavior after applying overload was improved in the case in which pins were inserted into stop-holes.View full abstractDownload PDF (1318K)
Review
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Lagrangian Formulation for Axisymmetric ProblemShoichi YOSHIDA2012 Volume 50 Issue 1 Pages 33-43
Published: January 25, 2012
Released on J-STAGE: January 25, 2013
JOURNAL FREE ACCESSThe floating roofs are widely used to prevent evaporation of content in large oil storage tanks. The 2003 Tokachi-Oki Earthquake caused severe damage to the floating roofs due to liquid sloshing. This accident becomes a cause and the structural integrity of the floating roofs for sloshing has been actively studied. However, many designers do not have a method except for the three-dimensional analysis using the general purpose finite element code. The simplified and convenient method for the sloshing of floating roof tank is desired. This paper presents a simplified development method of a finite element analysis code. It is carried out by modifying an existing structural analysis code. The fluid behavior is formulated in terms of displacement as the Lagrangian approach.View full abstractDownload PDF (1496K)
Report
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Overview of 2011 ASME Pressure Vessels and Piping ConferenceOsamu WATANABE, Takashi KOBAYASHI, Kunio HASEGAWA, Susumu TERADA, SATO ...2012 Volume 50 Issue 1 Pages 44-54
Published: January 25, 2012
Released on J-STAGE: January 25, 2013
JOURNAL FREE ACCESSDownload PDF (451K)
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