All issues
Volume 32 (1994)
- Issue 6 Pages 288-
- Issue 5 Pages 240-
- Issue 4 Pages 184-
- Issue 3 Pages 130-
- Issue 2 Pages 66-
- Issue 1 Pages 4-
Predecessor
Volume 32, Issue 4
Displaying 1-5 of 5 articles from this issue
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Kazuyoshi SEKINE, Kenichi AIZAWA, Takefumi KASAJIMA1994 Volume 32 Issue 4 Pages 184-190
Published: July 25, 1994
Released on J-STAGE: August 05, 2010
JOURNAL FREE ACCESSA detailed description of results for infra-red (IR) thermal non-destructive evaluating of alumina plate as a substrate of electric modules is presented. The test samples were contacted on the flat surface of regulated hot-thermal mass (metal base) which has a very high heat capacity. The thermal images for the temperature distributions which were caused by the macroscopic geometrical-faults of the shape of alumina plates, such as a surface curvature, were measured by the IR thermographic system. The combined method of triple median filtering and smoothing have been used to reduce noise effects for high image quality.
The temperature distributions of the plate sample from the experimentally processed images were compared with their real geometrical shape of plate. And a good correlation between them was obtained.
It is concluded that the thermal image technique, which was developed in this study, provided the powerful quality control method of alumina substrates of electric modules.View full abstractDownload PDF (2262K) -
Masafumi YAMAZAKI1994 Volume 32 Issue 4 Pages 191-199
Published: July 25, 1994
Released on J-STAGE: August 05, 2010
JOURNAL FREE ACCESSWind resistant design of Floating-Roof Tanks (FRT) has been mainly focused on design of wind girder of tank shell rather than wind resistant design of floating-roof. It is partly because floating-roof is considered a secondary structure, if it is compared with tank shell. partly because quantifying the wind is difficult.
In this paper, influence of the wind is quantified dynamically, taking 120, 000kl-FRT as an example. Steady and dynamic flow field by CFD, chracteristic vibration of floating-roof and stress on roof are analysed, considering the heaviest class 80m/s wind. Using results of fatigue testing of lap joint, fatigue damage factor is estimated and safety assessment is done. The relation between static moment of rotation on pontoon and dynamic displacement of pontoon, and frequency of pressure fluctuation on roof are estimated. That leads fluctuation frequency for fatigue strength estimation can be found, which means this desing technique will be useful.View full abstractDownload PDF (1020K) -
Introduction of JIS B 8284Shozo YANAGIDA, Akira SUZUKI, Makoto AKATSU1994 Volume 32 Issue 4 Pages 200-209
Published: July 25, 1994
Released on J-STAGE: August 05, 2010
JOURNAL FREE ACCESSJIS B 8284 (Quick Closure for Pressure Vessels) was issued in 1993 as the design standard of pressure retaining parts (including load transmission parts) to be used as quick closure devices of pressure vessels.
The quick closure devices are now widely adopted in various industries- for extraction of effective ingredients, sterilization or washing process in food, perfumery, medical and other industries; press-bonding facilities of glass; or for sintering facilities of ceramics and other newly developed materials. In these facilities, the closures are subjected to frequent opening and closing operations for charge of raw materials and take-out of processed materials, and various types of quick closurs are adopted there.
Because there were no standardized design methods available so far, notwithstanding the popularized use of these quick colusre devices, it was intended to standardize the design by the issue of JIS B 8284. In JIS B 8284, the quick closure devices have been classified to (1) clamp connection type (integral type and devided type), (2) integral type (clamp type with ratch, and sectional ring type), and (3) yoke frame type (rectangular frame and obround frame). This standard is applicable for closures of design pressre less than 1, 000kgf/cm2 and of design temperature less than 250°C.
In this article, the equations for design calculation standardized by JIS B 8284 have been explained for each of the categorized types of the closures.View full abstractDownload PDF (818K) -
Hajime HIRAKAWA, Hiroyoshi YOKOYAMA1994 Volume 32 Issue 4 Pages 210-219
Published: July 25, 1994
Released on J-STAGE: August 05, 2010
JOURNAL FREE ACCESSCylindrical shells are often used for structural members, because of its structurally reasonable shape. But it is well-known that local buckling often occurs is a cylindrical shell under axial compressive load, whose structural stability is generally affected by size and shape of geometric imperfections. Therefore, it is one of the most important themes in design to determine the allowable compressive stress and its tolerance of imperfection.
We have investigated the design codes, specifications and standards for unstiffened cylindrical shells under axial compressive loads and compared their allowable stresses.
In this paper, we introduce some of them for reference data of design.View full abstractDownload PDF (884K) -
Takayasu TAHARA1994 Volume 32 Issue 4 Pages 220-227
Published: July 25, 1994
Released on J-STAGE: August 05, 2010
JOURNAL FREE ACCESSOn the opportunities to attend PVRC and MPC meeting in San Antomio in January and in Dallas TX and Columbus in May 1994. activities of PVRC and MPC which promote, conduct and/or coordinate needed research in pressure vessel field which contributes development of international Codes and Standards such as ASME are reviewed. And recent activities of JPVRC which promotes closed co-research work with PVRC and MPC in Japan are also reported.View full abstractDownload PDF (843K)
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