138件が見つかりました。

並び替え
第10回
配管材料の環境割れシミュレーション
著者:
堤 三佳,Mitsuyoshi TSUTSUMI,黄木 景二,Keiji OGI,菊池 和彦,Kazuhiko KIKUCHI
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Environmental stress cracking (ESC) is one of the important causes of failure of a polymer product such as a pipe for chemicals. Both mechanical loading and diffusion of chemical from the surfa of material are dominant factors of ESC. In this study, growth ehavior of ESC was simulated by FEM analysis as a structure-diffusion interaction problem. The results show that the crack growt rate and the crack surface shape were affected by the diffusional rate and diffused concentration distribution in the materia...
英字タイトル:
FEM analysis on environmental stress cracking for plastic pipe materials
第10回
配管系の熱疲労評価技術の開発
著者:
笠原 直人,Naoto KASAHARA,伊藤 隆基,Takamoto ITOH,岡崎 正和,Masakazu OKAZAKI,東芝 奥田,奥田 幸彦,Yukihiko OKUDA,釜谷 昌幸,Masayuki KAMAYA,中村 晶,Akira NAKAMURA,町田 秀夫,Hideo MACHIDA,MRI 松本,松本 昌昭,Masaaki MATSUMOTO
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Nuclear piping has various kinds of thermal fatigue failure modes. Main causes of thermal loads are structural responses to fluid temperature changes during plant operation. These phenomena have complex mechanisms and so many patterns, that their problems still occur even though well-known issues. To prevent thermal fatigue due to above thermal loads, the JSME guideline is adopted. Both thermal load and fatigue failure mechanism have been investigated and summarized into the knowledgebase. Based on abo...
英字タイトル:
Development of thermal fatigue evaluation methods of piping systems
第10回
配管要素の組み合わせにより発生した旋回流の 配管減肉に与える影響について
著者:
山本 啓,Kei YAMAMOTO,鈴木 翔太,Shota SUZUKI,中村 隆夫,Takao NAKAMURA,米田 公俊,Kimitoshi YONEDA,渡辺 瞬,Syun WATANABE
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Flow accelerated corrosion (FAC) is the major pipe wall thinning phenomena in power plants. The management of pipe wall thinning has been carried out to pipe elements such as elbow, orifice, etc. of the piping system in power plants. In piping system, it is known that several pipe elements which are connected in series may generate swirl flow. Therefore the arrangement of pipe elements is considered to affect thinning phenomena seriously. So the behavior of this swirl flow is one of the major research ...
英字タイトル:
EFFECT OF SWIRL FLOW GENERATED BY THE COMBINATION OF PIPE ELEMENTS ON WALL THINNING PHENOMENA
第10回
鋳造ステンレス鋼配管溶接部における軸方向き裂の 大型振動子探触子による超音波探傷試験とシミュレーション解析
著者:
西川 嘉人,Yoshito NISHIKAWA,石田 仁志,Hitoshi ISHIDA
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Ultrasonic testing is difficult for cast stainless steel which is used as the material of main coolant pipes in pressurized water reactors, because of the ultrasonic scattering by the huge grain of the material. Therefore we performed ultrasonic testing for the axial fatigue crack on welding area in the test piece of the cast stainless pipe, using the double big-size ultrasonic probes which we developed. And we simulated the ultrasonic beam behavior using finite element ultrasonic propagation simulatio...
英字タイトル:
Ultrasonic testing and simulation analysis by the large aperture transducer for axial crack in cast stainless steel pipe weld
第10回
鋼構造物の劣化診断に向けた圧子押込み試験による塑性損傷の評価手法の開発
著者:
宮部 美紗,Misa MIYABE,伊與田 宗慶,Muneyoshi IYOTA,岡野 成威,Shigetaka OKANO,望月 正人,Masahito MOCHIZUKI
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In the present study, a semi-destructive method for estimating the mechanical properties, including plastic strain, of materials was developed using the instrumental indentation technique (IIT). The formula for estimating plastic strain was derived using true stress-true strain curves that were measured by IIT. The developed method requires only one parameter, namely, the work hardening coefficient, for estimating the plastic strain of pre-strained materials. The usefulness of the developed method was ...
英字タイトル:
Study on Evaluation Method of Plastic Damage using an Indentation Technique for Degradation Diagnosis of Steel Structures
第10回
長期停止無線ノード間の通信における電力制御
著者:
佐々木 隆志,Takashi SASAKI,松井 隆,Takashi MATSUI
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For a long term data gathering over sensor network via battery powered wir eless node, intermittent operation and periodical sleep is mandatory to a chieve energy savings. Synchronized data transmission technique is widely used for this purpose and central controller is usually required. When th e synchronization is lost and a wireless node loses its counterpart, it sh ould start continuous observation and the power consumption increases. Su ch situation is commonly-seen in system failure. In this paper w...
英字タイトル:
Power management for wireless network with long-time sleeping nodes
第10回
開口合成法によるコンクリート内構造物の 探査精度向上に関する検討
著者:
岡部 克也,Katsuya OKABE
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Important structures like electricity conduits might be embedded in floors or walls of the concrete structure, such as a power plant. For that reason, preliminary survey by electromagnetic wave pulse radar has been performed in the case of hacking over concrete surface in remodeling and others. However, there are cases where these structures are overlooked because reinforcing steel becomes an obstacle. Therefore, a high-precision inspection is required further. Now, we introduce a technique for locatin...
英字タイトル:
Study on accuracy improvement to locate targets within concrete structures by the aperture synthesis
第10回
関西電力の安全対策強化の取り組み
著者:
上山 逸平,Ippei UEYAMA
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The Kansai Electric Power Company has been carrying out continuously activity for the improvement in safety of nuclear power plants after the TEPCO Fukushima Daiichi NPP accident. We thought that the main causes of having resulted in the severe accident were based on the long time SBO and the LUHS accompanying flood, and installed the alternate mobile power source and the alternative injection pumps while implementing the measure against waterproofing as the first safety measures. Now, we are also im...
英字タイトル:
The measure for safety-measures strengthening in the Kansai Electric Power
第10回
電磁診断技術による歯車摩耗量評価手法の研究
著者:
萱田 良,Ryo KAYATA,堀 輝人,Teruhito HORI,角皆 学,Manabu TSUNOKAI,ペラン ステファン,Stephane PERRIN
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A new electromagnetic method for the nondestructive evaluation of gears is proposed. A permanent magnet generates a static magnetic field and a coil of several hundred turns wrapped around it is used to pick up eddy currents induced inside rotating gears. This electromagnetic nondestructive evaluation method is applied to the rotating machine with gears. By monitoring the movement of the gear in a rotating machine, the wear of teeth of gear has been evaluated. ...
英字タイトル:
Study of Evaluation Method for the Amount of Wear-Out of Gears with Electromagnetic Sensor
第10回
電磁逆解析に基づく複雑形状部材中の表面欠陥評価
著者:
中住 昭吾,Shogo NAKASUMI,鈴木 隆之,Takayuki SUZUKI
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Defect in a stud bolt was evaluated by using fluxgate (FG) magnetic sensor. In order to analyze defect shape and size quantitatively, the relationship between magnetic flux densities and magnetic dipole moment on the defect plane was formulated in cylindrical coordinate system. Periodicity was observed alonglongitudinal direction in magnetic flux density distribution measured by fluxgate magnetic sensor. The inverse analysis based on Tikhonov regularization technique was performed by using magnetic flu...
英字タイトル:
Evaluation of Surface Defect on ComplexShapedComponentBased on Electromagnetic Inverse Analysis