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Article type: Appendix
Pages
App11-
Published: October 05, 2000
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Masahisa Higuchi
Article type: Article
Pages
595-596
Published: October 05, 2000
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The agreement of WTO and TBT has led to an increase in the influence of international codes and standards such as ISO and IEC on world trade. There has been great concern in Japan, as a trading nation, that influence harmful to the national interest may arise through unfairness in the international codes and standards. This may be especially germane to Japan, since the U.S. has always had substantial free market competition and now the U.E. is also moving rapidly in that direction. Therefore, representatives in various fields (government offices, electric utilities, and manufacturing industries, etc.) held summit meetings in the period from 1997 to 1998 to discuss and establish a strategy for international codes and standards.
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Hideo KOBAYASHI
Article type: Article
Pages
597-598
Published: October 05, 2000
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Shigemitsu KIHRA, Akira OHTOMO
Article type: Article
Pages
599-600
Published: October 05, 2000
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Masao Honjin
Article type: Article
Pages
601-602
Published: October 05, 2000
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Hiroyoshi Murakami
Article type: Article
Pages
603-604
Published: October 05, 2000
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Takanari OKAMURA
Article type: Article
Pages
605-606
Published: October 05, 2000
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This paper describes the necessity of consideration aerothermodynamic phenomena change in evaluating deterioration and damage of hot parts in power generation apparatus. Concerning the turbine cooled rotor blade which are critical hot parts of gas turbine, the metal temperature of long term serviced blades became higher than that of short term serviced one. This change was caused by the increment of heat transfer coefficient on rotor blades because of the increase in blade surface roughness. The effect of aerothermodynamic phenomena change on the damage of the turbine cooled rotor blades is discussed.
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Yukio TAKAHASHI
Article type: Article
Pages
607-608
Published: October 05, 2000
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Naoki MIURA, Yukio TAKAHASHI, Yasunari NAKAYAMA
Article type: Article
Pages
609-610
Published: October 05, 2000
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In order to substantiate the safe operation of fast reactor plant components at elevated temperature exceeding 500C, an evaluation of structure integrity under the presence of crack-like defects is required to complement design assessment. CRIEPI has generated the guideline for structural integrity assessment for fast reactor plants. Part II of this guideline concerns flaw evaluation, and provides a simplified J-evaluation method to predict creep-fatigue crack propagation behavior. The revision of the guideline is currently under way to improve the predictability of the method. This paper gives an outline of the modification of the simplified J-estimation method using reference stress, including the consideration of elastic follow-up.
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Haruki MADARAME
Article type: Article
Pages
611-612
Published: October 05, 2000
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Takashi SHIMAKAWA, Sabrou USAMI, Koichi KOIZUMI, Kenzo MIYA, Hideo KOB ...
Article type: Article
Pages
613-614
Published: October 05, 2000
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Kenji Yamamot
Article type: Article
Pages
615-616
Published: October 05, 2000
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[in Japanese], [in Japanese]
Article type: Article
Pages
617-618
Published: October 05, 2000
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Yoshio Kitsunai
Article type: Article
Pages
619-620
Published: October 05, 2000
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"Specification for the design of crane structures" was issued in 1976 as JIS B8821. Since then, fatigue life of cranes has been designed as 2×(10)^6 cycles. Recently, some cranes have been used beyond the designed operation ratio because of demands of increasing transportation quantities. More long fatigue life has been cried for crane structures. Therefore, amendment for the specification has been carried out. In the revised specification, fatigue design curves of welding joints subjected to normal stress are composed of 15 curves depending on strength category of the joints, and the fatigue lives are covered in the range from (10)^4 to (10)^8 cycles. Fatigue strength under variable amplitude stresses can be evaluated based on the linear damage rule. Fatigue assessment can be carried out by using design stress, allowable stress and safety factors.
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Koichi Kashima
Article type: Article
Pages
621-622
Published: October 05, 2000
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Tsutomu UMEDA, Koji MIMURA, Shinji TANIMURA
Article type: Article
Pages
623-624
Published: October 05, 2000
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Koji MIMURA, Tutomu UMEDA, Shinji TANIMURA
Article type: Article
Pages
625-626
Published: October 05, 2000
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[in Japanese]
Article type: Article
Pages
627-628
Published: October 05, 2000
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Emiko Kanoshima
Article type: Article
Pages
629-630
Published: October 05, 2000
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Norifumi SAITO
Article type: Article
Pages
631-632
Published: October 05, 2000
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Masaya KAWAMURA, Michio OBARA
Article type: Article
Pages
633-634
Published: October 05, 2000
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JST is examining the project of "Failure and Knowledge Database" for the purpose of being utilized for R & D and operations in the field of science and technology. This database consists of three types of databases, "reports of sample cases", "factual data taken out from the reports" and "knowledge extracted by the specialists' analysis". By making these three databases related to each other, we intend to establish the system that will make the search results available "for anyone, at anytime and in any form".
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Minoru YAMADA
Article type: Article
Pages
635-636
Published: October 05, 2000
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Kenji KASHIWAYA
Article type: Article
Pages
637-638
Published: October 05, 2000
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Masazumi TANAKA
Article type: Article
Pages
639-640
Published: October 05, 2000
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Kenichi OOYAMA, Kyoichi ASANO, Hideo KOBAYASHI, Satoshi KANNO
Article type: Article
Pages
641-642
Published: October 05, 2000
Released on J-STAGE: August 01, 2017
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Yoshihisa MINAKUCHI, Yoichi AMIKURA
Article type: Article
Pages
643-644
Published: October 05, 2000
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The crack growth behavior on steel compact specimens was investigated by the echo characteristic of surface wave emitted toward the end of notch under low cycle fatigue. The echo height reflected from the edge of crack and the round-trip propagation time from the surface wave probe to the edge of crack were measured for evaluating the crack growth behavior. The crack was generated from the edge of notch when the round-trip propagation time suddenly increased or the ratio of the echo height suddenly decreased. After that, The crack grew with repeating progress and stagnation alternately, and the compact specimen broke. Judging from the results of fracture surface observed by the scanning electron microscope, The fracture surface is a stripe pattern, and the distance between the lines corresponded to the part of the stagnation.
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Akito NITTA
Article type: Article
Pages
645-646
Published: October 05, 2000
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Akio Fuji, Masataka YATOMI, Takanori FUKUDA, Yasuo HORIBA, Munemitsu F ...
Article type: Article
Pages
647-648
Published: October 05, 2000
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Database for damage and trouble of structural components has been developed in the company network. It includes "Material and Structure", "Corrosion", "Boiler", "Vibration", "Thermal and Fluid" as the data series. Keywords to refer the database are provided in each field respectively. In order to take effect in education and transmittal of know-how to designers, countermeasure and precept are shown in each case. Cases of more than 700 have been generated in the database continuously.
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Hiroyuki TERADA
Article type: Article
Pages
649-650
Published: October 05, 2000
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Hideo KOBAYASHI, Shouzo YANAGIDA
Article type: Article
Pages
651-652
Published: October 05, 2000
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Shouzo YANAGIDA, Hideo KOBAYASHI
Article type: Article
Pages
653-654
Published: October 05, 2000
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Hideo KOBAYASHI, Takeshi OGAWA, Shouzo YANAGIDA
Article type: Article
Pages
655-656
Published: October 05, 2000
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In the present study, fracture tests by hydraulic pressure were performed on corroded and/or artificially flawed colsed-cylindorical-vessels as well as similar new vessels. The results were analized and evaluated by fracture mechanics. Critical pressure for plastic collapse of all the vessels were predicted reasonablly by an equation which assumed a thin thickness with strain hardening material. The results revealed the condition for leak before burst (LBB). Fatigue life of corroded and/or flawed vessels were predicted based on the above results for fatigue crack growth and final plastic collapse evaluated by fracture mechanics. The prediction suggested that corrosion thinning upto half thickness of vessels could be allowed with carefull attention
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Sumio TANAKA
Article type: Article
Pages
657-658
Published: October 05, 2000
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Masaaki MISUMI, Masafumi OHKUBO, Fumio KOYANAGI
Article type: Article
Pages
659-660
Published: October 05, 2000
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Reversed tortional fatigue test of sandglass type specimen with a small flat surface notch was conducted at room temperature for a pure iron and a reduced activation ferritic steel F-82H in a solenoid coil cooled by water. Specimen was not constrained lonitudinally to avoid the additional stress induced by magnetostriction. Magnetic flux density in specimen, about 0.7 Tesra, was in rotation magnetization condition. Initiation and propagation behavior of large number of small cracks were observed on the flat surface notch by using image processing technique. For pure iron, crack initiation became earlier and crack growth faster in magnetic field. For F-82H steel influence of magnetic field did not observed.
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Masahiro Sasada, Tuyoshi Nakatsuji, Kazuya Okubo, Toru Fujii, Naganao ...
Article type: Article
Pages
661-662
Published: October 05, 2000
Released on J-STAGE: August 01, 2017
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Cyclic braking tests under extremely severe conditions were carried out using large one-piece brake discs having several holes in their flange. When the number of braking cycles was beyond a certain number of cycles, some tiny cracks occurred in the radial direction around holes were found. They grew in the radial direction of the brake discs. In order to examine whether braking torque is a driving force for crack initiation or not, the time interval was altered 10 times longer than the normal condition. The experimental results showed that the number of total cracks around holes after the same rotations decreased as the braking interval was extended. The crack length also decreased. These results indicate that the braking torque itself does have less direct effect on the crack initiation.
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Ken TAKAHASHI, Tokuo TERAMOTO
Article type: Article
Pages
663-664
Published: October 05, 2000
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Hideki NAKASHIMA, Tsutomu EZUMI, Susumu TAKAHASHI
Article type: Article
Pages
665-666
Published: October 05, 2000
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Kentaro NISHIMURA, Tsutomu EZUMI, Susumu TAKAHASHI
Article type: Article
Pages
667-668
Published: October 05, 2000
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Akihiro MAEDA, Hisao HASEGAWA
Article type: Article
Pages
669-670
Published: October 05, 2000
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This paper deals with the thermal stress problems of an elastic solid with a rigid spherical inclusion under a uniform temperature change. It is assumed that there are partially debonded interfaces between the surfaces of the inclusion and the matrix. We use a body force distribution method for the stress concentration problem. For this purpose, we apply the fundamental solution for axisymmetric body force problems of elasticity. The thermal stress fields are expressed by the elastic field due to temperature and the elastic filed due to body forces. Stress distributions around the inclusion are shown, and compared with the results for an elastic solid with a partially debonded rigid sphericaal inclusion under tension.
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Eiichiro TSUCHIDA, Yoshio ARAI, Ying ZHENG
Article type: Article
Pages
671-672
Published: October 05, 2000
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The paper presents a axisymmetric solution for the stresses and displaements in an elastic thick plate containing an oblate spheroidal inclusion under axisymmetric bending around the z axis. The related spherical cavity and inclusion problems were solved by Tsuchida et al. by using Boussinesq's displacement potentials. The surfaces between the inclusion and the matrix are assumed perfect bonding. The solution is based upon Boussinesq's displacement potentials. Numerical examples are given.
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Kiyotsugu OHJI, Tetsuya TSUJIKAMI, Yoshihisa MAEDA
Article type: Article
Pages
673-674
Published: October 05, 2000
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Hideaki ITO, Tsutomu EZUMI, Susumu TAKAHASHI
Article type: Article
Pages
675-676
Published: October 05, 2000
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Yuuta AONO, Hiroshi NOGUCHI
Article type: Article
Pages
677-678
Published: October 05, 2000
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The stress concentration factor of cyclic notches is influenced by the notch root radius, the notch depth, the notch pitch and so on. Therefore, the concept of the equivalent ellipse is not directly applicable to cyclic notches. In this paper, the solution is given for a half plate with cyclic notches under uniform normal stress at infinity. The formulation of this problem is treated as a Hilbert's problem and complex variable method is used to obtain the solution.
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Sunyoung SON, Shinichi NISHIDA, Nobusuke HATTORI
Article type: Article
Pages
679-680
Published: October 05, 2000
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S. NISHIDA, N. HATTORI, J. YE, S. WANG, H. TAMASAKI
Article type: Article
Pages
681-682
Published: October 05, 2000
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In this study, fatigue tests had been carried out to investigate the optimum value of deformation of notched specimen by roller-working. Here, the specimen which has a deformation value of 0.25mm is tested. The deformation values are 0,0.5 and 1.0mm to compare to the former testing results by keeping the final shapes and dimensions except for deformation value. The main results are obtained as follows : (1) The potimum value of deformation of notched specimen by roller-working is 0.5mm. (2) Fatigue strength of notched specimen by roller-working increase with increasing plastic deformation value when the deformation value is les than 0.5mm, but when the value is larger than 0.5mm the result is opposite.
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Article type: Appendix
Pages
App12-
Published: October 05, 2000
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Shinobu YOSHIMURA
Article type: Article
Pages
683-684
Published: October 05, 2000
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Atsushi Yokoyama, Motoharu Tateishi
Article type: Article
Pages
685-686
Published: October 05, 2000
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Kazuhiro OGAWA, Nagahisa OGASAWARA, Qiang YU, Masaki SHIRATORI, Koji S ...
Article type: Article
Pages
687-688
Published: October 05, 2000
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The purpose of this study is to clarify the cause of difference between analytical reslut and experimental result. Hydro forming analysis was carried out at first. After that, impact crash analysis was carried out. In order to investigate the effect of hydro forming process such as wall thinning, residual stress and residual strain on impact crash analysis, the anslysis considering the manufacturing process was compared with that not considering the manufacturing process. The summary of reslts obtained through the present study is as follows : (1) The plastic strain caused by hydro forming affect on the deform behavior mode and absorbed energy in impact crash analysis. (2) The wall thinning caused by hydro forming doesn't affect on the deform behavior mode and absorbed energy in impact crash analysis. (3) The residual stress before spring back doesn't affect on the deform behavior mode and absorbed energy in impact carsh analysis. (4) The quantity of deference between the anslysis without all effects of hydro forming and that one with all effects of hydro forming depends on n value and total strain.
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Shinichi NISHIDA, Nobusuke HATTORI, Kenji KODASHIRO, Masayoshi SUEHIRO ...
Article type: Article
Pages
689-690
Published: October 05, 2000
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