All issues
Volume 28 (1990)
- Issue 6 Pages 276-
- Issue 5 Pages 218-
- Issue 4 Pages 166-
- Issue 3 Pages 114-
- Issue 2 Pages 62-
- Issue 1 Pages 4-
Predecessor
Volume 28, Issue 4
Displaying 1-5 of 5 articles from this issue
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Ishimatsu NOHARA1990 Volume 28 Issue 4 Pages 166-173
Published: July 25, 1990
Released on J-STAGE: August 05, 2010
JOURNAL FREE ACCESSIt is very important to pay much attention at the stage of design or fabrication for maintaining the safety of pressure vessels during their operations. From this standpoint, I will make comments on safety assesment, consideration to be paid for selection of materials or welding procedures of pressure vessels.
Recently, many pressure vessels have been installed as a part of the plant and operated by automatic control systems. Under such situation, we shall consider on man. machine interface much more. In this paper, I will also lay stress on this matter.
At the last, I will explain the latest tendency of the construction codes on pressure vessels enacted in the foreign countries.View full abstractDownload PDF (942K) -
Tatsuhito TAKAHASHI1990 Volume 28 Issue 4 Pages 174-181
Published: July 25, 1990
Released on J-STAGE: August 05, 2010
JOURNAL FREE ACCESSTwo ceramic gas turbine projects for 300kW electric power generators and also 100kW automobile engines are on-going in Japan for their multifuel capability and high thermal efficiency. Silicon nitride is a strong candidate material for gas turbine components used at high turbine inlet temperature of 135°C because of its high temperature strength and high thermal resistance. This paper describes the review of the recent research & technology development of high-fracture-toughness and high-temperature strength silicon nitride ceramics including sialons.View full abstractDownload PDF (6527K) -
Kazuyoshi SEKINE, Haruto SAITO1990 Volume 28 Issue 4 Pages 182-192
Published: July 25, 1990
Released on J-STAGE: August 05, 2010
JOURNAL FREE ACCESSThe percolation model, which describes the geometrical feature of two dimensional plane-like pattern formed by the stochastic process in the random medium, is considered to be a simple one for the formation and growth of crack-like defects in the materials. We have simulated the internal crack size distribution for a wide range probabilities of penetrating in the three dimensional materials using the Monte Carlo procedure based on this percolation model. In particular, we have made an attempt to apply the simulated results for concept of extremes of materials behaviors, the well-known Weibull distribution of fracture strength in brittle materials. The main results obtained are as follows;
(1) Under the condition of a constant probabilities of penetration, the percolation clusters which is defined as the crack, are distributed in size as the Parato type frequency density function;
f(a)=Ka-(n+1) (in a range of large a)
where a is a charateristic cluster diameter, and K and n are positive parameters.
(2) The statistical distribution of the simulated maximum size of claster (maximum crack size) in each specimen is expressed in terms of the second asymptotic function of largest value in the sense of the statistics of extremes.
(3) The application of the concept of fracture mechanics to the simulated crack size distribution characteristics provides the physical explanation for the experimental facts that the fracture strength of brittle materials follows a two-parameter Weibull distribution.View full abstractDownload PDF (1030K) -
Yoshihiro SABA, Mitsuo WAGATSUMA1990 Volume 28 Issue 4 Pages 193-200
Published: July 25, 1990
Released on J-STAGE: August 05, 2010
JOURNAL FREE ACCESSA small-scale 650kl LNG inground storage tank was completed at an LNG satellite station of Tokyo Gas located in a densely populated area and is now in successful operation. This is the world's smallest inground storage tank newly development in pursuit of extensive safety, environmental acceptability and effective use of land area for the satellite. This tank was designed on basis of the techniques of large-scale LNG inground storage tanks constructed so far and we made further improvements to apply to small-scale tank. these improvements include:
I) Adopting high-reliable concrete body, whose side wall is integrated with thick bottom slab, constructed by normal concrete lining method under open cut with retaining wall.
II) Utilizing soil mixing wall as retaining wall.
III) Adopting extremely simplified bottom heater system.
IV) Adopting new type roof structure with insulation directly lined inside.
In addition to these, we incorporated various reasonable structures and construction methods making the best use of small-scale features.View full abstractDownload PDF (6972K) -
Masanori KAWAHARA1990 Volume 28 Issue 4 Pages 201-205
Published: July 25, 1990
Released on J-STAGE: August 05, 2010
JOURNAL FREE ACCESSDownload PDF (4734K)
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