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Volume 53 (2015)
- Issue 6 Pages 292-
- Issue 5 Pages 246-
- Issue 4 Pages 164-
- Issue 3 Pages 112-
- Issue 2 Pages 56-
- Issue 1 Pages 5-
Predecessor
Volume 53, Issue 3
Displaying 1-4 of 4 articles from this issue
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Original Paper
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- Effect of Internal Pressure -Runze ZHOU, Ikuo KOJIMA, Ryuta SUZUKI, Hirokazu TSUJI2015 Volume 53 Issue 3 Pages 112-119
Published: May 25, 2015
Released on J-STAGE: June 25, 2015
JOURNAL FREE ACCESSFitness-For-Service (FFS) assessment is a quantitative engineering approach that is used to determine the equipment with a flaw or damage is fit to continue operation. It can be used to make run-repair-replace decisions to help determine if pressured equipment containing flaw can continue to operate safety for some desired future period.
This paper provides a FFS assessment method on carbon steel pipe which contained a LTA (Local Thin Area) against seismic load and internal pressure load by FEM (Finite Element Method) analysis. Abaqus Ver. 6. 14, which provides the combined isotropic⁄kinematic hardening model, is used to simulate the LTA contained carbon steel pipe against seismic load and internal pressure load. Material parameters in the hardening model are identified by a symmetric strain cycle experiment based on ASTM E606. Isotropic hardening component is introduced by specifying the equivalent stress defining the size of the yield surface, as a tabular function of the equivalent plastic strain. Kinematic hardening component is obtained from the stabilized cycle of a specimen that is subjected to symmetric stain cycles.
The authors calculated up to 100 cycles on carbon steel pipe which contained a Local Thin Area against seismic load and internal pressure at room temperature. The results comparison between FEM analysis and experiment shows that delta-strain for one cycle and number of cycles to failure is predicted accurately. Safety margin of ratcheting assessment also was discussed in this paper.View full abstractDownload PDF (374K) -
Shoichi YOSHIDA2015 Volume 53 Issue 3 Pages 120-131
Published: May 25, 2015
Released on J-STAGE: June 25, 2015
JOURNAL FREE ACCESSPowerful tsunami attacked to the northeast coast of Japan due to the Great East Japan Earthquake occurred on March 11, 2011. There are many fishing ports along the coastal line. Several small aboveground storage tanks (ASTs) storing the fuel for fishing boats were installed at the fishing ports. Tsunami moved the ASTs and overturned them. Some of them leaked oil and sank to sea. On the other hand, although both small ASTs with full liquid and large ASTs did not move, they were subject to external pressure of the tsunami. This paper presents the bifurcation buckling analysis of shell plates in large ASTs by the axisymmetric shell finite element method. The influence of both height and density of internal liquid to the buckling characteristics under external liquid pressure due to tsunami is described.View full abstractDownload PDF (1399K) -
Yutaka TSUCHIDA2015 Volume 53 Issue 3 Pages 132-139
Published: May 25, 2015
Released on J-STAGE: June 25, 2015
JOURNAL FREE ACCESSState of hydrogen in V containing steel for spring (known as 9254V) was analyzed by peak separation of TDS desorption curves through Gaussian distribution. Then it was correlated to the results of hydrogen susceptibility test results, together with those of ordinary spring steel (SAE9254) . The state of hydrogen was different between them:V-containing steel was composed of two kinds of hydrogen traps originated by vanadium carbides, along with lattice, dislocation and grain boundary traps. In contrast, ordinary spring steel (SAE9254) was featured by hydrogen trapped by vacancy and vacancy cluster along with lattice, dislocation and grain boundary hydrogen. The amount of grain boundary hydrogen was found smaller in V containing steel, notwithstanding large amount of hydrogen absorption. This was claimed to be the major reason for the improved resistance hydrogen embrittlement.View full abstractDownload PDF (1065K) -
Ryutaro FUEKI, Hisanori ABE, Koji TAKAHASHI, Kotoji ANDO, Keiji HOUJOU ...2015 Volume 53 Issue 3 Pages 140-148
Published: May 25, 2015
Released on J-STAGE: June 25, 2015
JOURNAL FREE ACCESSEffects of Portable Pneumatic needle-Peening (PPP) on the bending fatigue limit of type 316 stainless steel welded joint containing an artificial semi-circular slit on weld toe were investigated. PPP were conducted on the weld toe containing a semi-circular slit with a depth of a=1. 0 and 1. 5mm. Then, bending fatigue tests were conducted on the specimens. The fatigue limit of the peened specimen having a semi-circular slit of a=1. 0mm was equal to that of the peened welded test specimen without a slit. Therefore, a semi-circular slit less than a=1. 0mm could be rendered harmless by PPP. In addition, it was found that whether the semi-circular slit in weld toe is rendered harmless or not is decided by the relationship between the stress intensity factor range of semi-circular cracks and the threshold stress intensity factor. Furthermore, the bending fatigue limit before and after PPP could be predicted by modified Goodman diagram considering effects of change of residual stress, factor of stress concentration and hardness of weld toe.View full abstractDownload PDF (2010K)
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