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Volume 25 (1987)
- Issue 6 Pages 297-
- Issue 5 Pages 231-
- Issue 4 Pages 179-
- Issue 3 Pages 120-
- Issue 2 Pages 86-
- Issue 1 Pages 3-
Predecessor
Volume 25, Issue 2
Displaying 1-3 of 3 articles from this issue
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Akihiko KATAMINE, Motohisa ONOZAWA, Yuugoro ISHII1987 Volume 25 Issue 2 Pages 86-96
Published: March 25, 1987
Released on J-STAGE: August 05, 2010
JOURNAL FREE ACCESSThe ultrasonic detection method has long been used in varied manners to detect hardware defects occurring in chemical plant equipment. It is in this line of endeavor that the present authors developed a multitransducer as means of detecting defects and flaws occurring at and near the surface.
This paper describes the construction and operation of the multitransduser, and discusses its characteristics as noted in the authors' experimental work involving artificially created defects (side holes and slits).
The multitransducer was built in three prototypes, each having its own angle of refraction, namely, 45°, 60°or 70°. As applied to the side holes, they were found to have focal points (or points of maximum sensitivity) of 5mm (45°), 3mm (60°) and 3mm (70°), respectively. As applied to the slits cut out in mildsteel plates of 2mm, 3mm and 5mm in thickness, they demonstrated detection with favorable signal-to-noise ratio over the range in which the focal point coincided with the plate thickness.
In the experimentation involving shallow slits, it was found that the effects of interference between incident wave and reflected wave must be taken into consideration. Finally, they were operated on specimens having cracks to result in an experimental finding that the multitransducer can satisfactorily detect cracks with a good signal-to-noise ratio.View full abstractDownload PDF (8826K) -
Yasuhiro IWASAKI, Makoto AKAZU, Kazushi HIROTA1987 Volume 25 Issue 2 Pages 97-105
Published: March 25, 1987
Released on J-STAGE: August 05, 2010
JOURNAL FREE ACCESSRecently, the demand of a super high pressure and high temperature apparatus for the manufacturing of the composited materials made of metals and ceramics or the studies of the new materials by new process under the super high pressure etc. is on the increase.
This papper reports on the strenght analysis and the trial manufacturimg test of such apparatus.
As a result of this syudy, we obtained conclusions that;
(1) The internal pressure using the argon gas achieved to 10, 000kgf/cm by a method of two stage pressing.
(2) The strength of the pressing fit cylinder constructed 5 layers and the york fram wound up the piano wire with high tension indicated the good coincidence with the theories and the experiments.
(3) The basic concept for the practical uses or the large scale apparatus was clear.View full abstractDownload PDF (2228K) -
Technical Progress over the Two Decades. (VOL. 1)Satoru HOSOMI, Isao YOSHIDA1987 Volume 25 Issue 2 Pages 107-115
Published: March 25, 1987
Released on J-STAGE: August 05, 2010
JOURNAL FREE ACCESSDiamond compacts, or synthetic polycrystalline diamonds, find a wide range of application as an abrasive or wear-resistant material for machining tools, wire drawing dies etc. They may find a lot more in modern industry fields as well as some futuristic fields due to their economical advantage and moderated cleavage as compared with natural or synthetic single crystals of corresponding sizes, in addition to the potential availability more in abundance than natural occurring carbonados and ballasts.
More than two decades after the first efforts to produce such diamond compacts in early sixties, diamond compact techniques are flourishing again, with a significant improvement achieved in each of sintering technique, compact structure and size, etc, putting a wide variety on market including diamond-carbide layered composite compacts.
This paper reviews literature available principally in the form of patent and tries to show which way the technique is likely to go.View full abstractDownload PDF (6778K)
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