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Volume 35 (1997)
- Issue 6 Pages 300-
- Issue 5 Pages 236-
- Issue 4 Pages 174-
- Issue 3 Pages 116-
- Issue 2 Pages 42-
- Issue 1 Pages 2-
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Volume 35, Issue 5
Displaying 1-8 of 8 articles from this issue
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Katsuaki TAKEMURA1997 Volume 35 Issue 5 Pages 236-244
Published: September 25, 1997
Released on J-STAGE: August 05, 2010
JOURNAL FREE ACCESSRegulations for the design of pressure vessels are different for the purpose of the use by each controlling laws in Japan. Applicable materials and their allowable stresses which are prescribed in the technical descriptions in each low, and the recent revision on the materials are surveyed. Attention to the descriptions on the oversea materials is given.
The following laws are surveyed:
High Pressure Gas Safety Law
Electricity Utility and Industry Law
Gas Industry Law
Industrial Safety and Health LawView full abstractDownload PDF (1034K) -
Takashi MORIKAWA1997 Volume 35 Issue 5 Pages 245-249
Published: September 25, 1997
Released on J-STAGE: August 05, 2010
JOURNAL FREE ACCESSProblems and issues related to specifications for pressure vessel materials in Russia and Eastern Europe, two areas regarded with promise as inexpensive procurement sources for such materials. It was found that, in Europe as a whole (and, of course, in Eastern Europe as well), much progress is being made toward the adoption of unified European standards (EN) in place of various national standards. Described in this paper are the enactment of these standards, progress in the area of materials, accommodation to the standards in Eastern Europe, and their relation to existing national standards. Also discussed are the issues that this movement toward unified European standards poses for Japan.View full abstractDownload PDF (490K) -
Toshiya AKIYAMA1997 Volume 35 Issue 5 Pages 250-257
Published: September 25, 1997
Released on J-STAGE: August 05, 2010
JOURNAL FREE ACCESSA consideration was performed concerning to the ductile fracture dehavior of the pressure vessel with a large surface flaw. The pressure at the ductile fracture initiation has a distinct relation with the depth and the length of a surface flaw. Expressions for this relation were investigated by many researchers, but in the case of relatively a short surface flaw, the estimation seems to have not a coincidence with experiments. In this report, the rectification of the Kiefner's equation for the estimation of ductile fracture initiation from a large surface flaw was made by reflecting the restraint of flaw ends to the ligament of thickness. Re-estimation using the corrected equation had a relatively good coincidence with kiefner's burst data and author's data in the case of relatively a short surface flaw.View full abstractDownload PDF (2333K) -
Hiroshi MIMURA, Takayoshi OHSHIRO1997 Volume 35 Issue 5 Pages 258-263
Published: September 25, 1997
Released on J-STAGE: August 05, 2010
JOURNAL FREE ACCESSA study was made on scatter of the critical CTOD in HAZ of a SMAW weldment with heat input of 18kJ/cm, in comparison with a SAW weldment with heat input of 50kJ/cm tested in the preceding work. The following features in HAZ toughness of the former weldment were noticeable, in contrast to the latter weldment.
(1) Scatter of the critical CTOD in the HAZ was fairly less.
(2) Pop-ins were found with a little frequency.
(3) The HAZ of the weldment had the good critical CTOD irrespective of poor toughness in the synthetic HAZ for the local brittle zone.
These results are well explained by the small area for the local brittle zone, which was caused by tempering of the next welding pass.View full abstractDownload PDF (606K) -
Hiroshi KATAYAMA1997 Volume 35 Issue 5 Pages 264-275
Published: September 25, 1997
Released on J-STAGE: August 05, 2010
JOURNAL FREE ACCESSExpansion joints are important elements to absorb thermal expansion or long-term deformation of piping in heat transfer, gas or liquid transportation systems. In most cases, expansion joints have been prepared by using bellows, fabricated from stainless steel of thickness 1mm to 2mm. This solution is easy for metal forming in fabrication, but has a big difficulty to apply in under ground piping system. Main problem is the electrolytic corrosion due to the difference in ionization potential of materials between the bellows and main line pipes, which are usually made of carbon steels or low-alloy steels. Local corrosion troubles have often appeared by the effect of under-ground stray currents in long term service.
In order to overcome these problems, an expansion joint element was developed by bulge forming of pipes of the same steel as the main line pipes. This element was named as “snake pipe”, and have been extensively used in various application. For the purpose to provide design informations, a series of tests were conducted to examine the mechanical performance of the “snake pipe” specimens.
The present paper reports on the results of three basic loading tests; (1) axial loading, (2) internal pressure, and (3) bending, together with the examination of the precision of geometry and of the change in mechanical properties of materials during the forming process. The stress distribution obtained by strain gauge measurement were compared with an energy-approach solutions by Palmer under axial loading. The mechanical behaviors of “snake pipe” specimen were characterized by using a simple compliance model and compared with those of the reference straight pipe for the convenience to apply to the expansion joint design.View full abstractDownload PDF (1108K) -
Yasuto KATAOKA, Makoto SAITO1997 Volume 35 Issue 5 Pages 276-282
Published: September 25, 1997
Released on J-STAGE: August 05, 2010
JOURNAL FREE ACCESSA pressure vessel, composed of a welded aluminum liner partially reinforced with thin FRP, has been developed in order to achieve a considerable reduction in weight of a delivery type vessel for liquefied petroleum gas. In this paper, an emphasis is placed on investigation into damage of FRP layer. In case that a penetrated type cut damage in the perpendicular to fiber direction occurs in the FRP layer, unstable cracks to the fiber direction grow from both tips of cut damage by tensile stress in the fiber direction, and a band-like partial separation of FRP layer from the aluminum liner occurs. First, it is indicated that this FRP pressure vessel maintains sufficient strength even though such a band-like separation would occur. Second, a failure criterion of a circumferential crack growth from cut damage introduced into the FRP hoop layer is studied using FEM analyses and experiments of equivalent test pieces to the FRP layer of the vessel. This criterion can be expressed by an average shear stress and a characteristic damage area on the basis of a modified average stress model. Application of this criterion into an actual FRP pressure vessel demonstrates that an allowable size of the penetrated type cut damage could be predicted using the criterion within a practical accuracy.View full abstractDownload PDF (2349K) -
Yasuhira TAKESHI1997 Volume 35 Issue 5 Pages 283-287
Published: September 25, 1997
Released on J-STAGE: August 05, 2010
JOURNAL FREE ACCESSDownload PDF (575K) -
[in Japanese]1997 Volume 35 Issue 5 Pages 288-291
Published: September 25, 1997
Released on J-STAGE: August 05, 2010
JOURNAL FREE ACCESSDownload PDF (475K)
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