All issues
Volume 23 (1985)
- Issue 6 Pages 286-
- Issue 5 Pages 223-
- Issue 4 Pages 169-
- Issue 3 Pages 113-
- Issue 2 Pages 57-
- Issue 1 Pages 2-
Predecessor
Volume 23, Issue 2
Displaying 1-7 of 7 articles from this issue
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SEIICHIRO TSUJII, MASAO WAKATSUKI, TOSHIAKI YAMAGISHI1985 Volume 23 Issue 2 Pages 57-64
Published: March 25, 1985
Released on J-STAGE: August 05, 2010
JOURNAL FREE ACCESSAn enlarged, multi-anvil cubic high-pressure apparatus which utilized a link-mechanism to convert a uniaxial press force into multiaxial components, was developed and used for trial production of synthetic diamond.
The apparatus was provided with 6 cemented carbide anvils having square faces 30mm (or 27mm) on an edge.
The apparatus could achieve superior repeatability of the accurate anvil-alignment, excellent operaton-ability, and high productivity. Some effective measures carried out to prevent the blowouts of gasket and to equalize the loads of the vertical and horizontal axis anvils, much improved the performance of the apparatus.
The performance of the apparatus can be summarized as follows:
(1) On the synthesizing of diamond, the limits of the routinely usable pressure were 65kb for the 30mm-edged anvil and 70kb for the 27mm-edged anvil.
(2) Average life of 27mm-edged anvils was 2900 runs in the use at 70Kb and 1, 700°C.
(3) The equality of anvil loads was improved to within ±3%, resulting in decreasing the failure of the vertical axis anvils.
(4) The quality control of pyrophyllite blocks for the sample holders and the use of the two-staged angled anvils were effective in decreasing blowout accidents.View full abstractDownload PDF (6495K) -
Buckling Strength of Shell and Design FormulaHARUHITO OKAMOTO, MITSUGU ODA, SHIGEKI ITO, KAZUCHIKA KONNO1985 Volume 23 Issue 2 Pages 65-75
Published: March 25, 1985
Released on J-STAGE: August 05, 2010
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HIROAKI NAGAOKA1985 Volume 23 Issue 2 Pages 76-84
Published: March 25, 1985
Released on J-STAGE: August 05, 2010
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circumferentially notched round barAKIRA KIUCHI, MITSURU AOKI1985 Volume 23 Issue 2 Pages 85-91
Published: March 25, 1985
Released on J-STAGE: August 05, 2010
JOURNAL FREE ACCESSAn experimental study was conducted to investigate the fracture mode and fracture criterion in tearing mode (Mode III). The fracture mode in the deformation of Mode III was classified into two types: normal type and shear type. The former is induced by the maximum tensile stress near the notch tip, (σT)tip, and the latter by shear strain near the notch tip.
Circumferentially notched round bars (CNRB) fabricated from polymethylmethacrylate, cast iron and cast steel were loaded to fracture under torsion. It was found that the stress intensity factor in Mode III at which the normal type fracture initiates, KIIIc, is about 2.5 times higher than the fracture toughness in opening mode (Mode I), KIc.
In parallel with this, (σT)tip of CNRB under torsion (Mode III) and under tension (Mode I) was analyzed elasto-plastically with the aid of finite element method. For the value of (σT)tip, the corresponding stress intensity factor in Mode III, KIII, is greater than that in Mode I, KI. This is because the constraint to plastic flow in Mode III is much lower than that in Mode I. This numerical result demonstrates that KIIIc is greater than KIc, assuming that the normal type fracture initiates when (σT)tip reaches the critical value.View full abstractDownload PDF (4821K) -
OSAMU FUKUNAGA, MINORU IWATA1985 Volume 23 Issue 2 Pages 93-97
Published: March 25, 1985
Released on J-STAGE: August 05, 2010
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YUJI ONO1985 Volume 23 Issue 2 Pages 98-109
Published: March 25, 1985
Released on J-STAGE: August 05, 2010
JOURNAL FREE ACCESSVarious underground storage systems have been commercially developed in Europe and the United states. Among various methods of underground storage techniques, a salt cavern and unlined rock cavern are more constructed than the other.
However, due to the absense of rock salt layer in Japan, discussion of the techniques is limitted to the most promissing rock cavern method.
Recently, rock caverns for oil and LPG have been constructed in Korea and Formosa (China) for its credible safety, environmental preservation, economical feasibility and effective usage of a land.
Not a few underground storage research groups in Japan have visited Europe and the United States for the research and development. In 1980, the construction of a test-plant of rock cavern for crude oil has started, in Kikuma-Shikoku island, where the experimental result showed that the system is feasible from both technical and economical points of view.
The present potential sites for constructing rock caverns for oil are, Kushikino, Kikuma and Kuji, for which feasibility study has been carring out.
In succession to oil storage, construction of rock caverns for LPG is expected.View full abstractDownload PDF (8887K) -
[in Japanese]1985 Volume 23 Issue 2 Pages 111
Published: March 25, 1985
Released on J-STAGE: August 05, 2010
JOURNAL FREE ACCESSDownload PDF (2518K)
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