102件が見つかりました。

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第2回
き裂発生・進展特性評価のための 粒界すべりおよび微視的不均質性を考慮した数値解析モデルの開発
著者:
新池 修平,Shuhei SHINIKE,樋口 良太,Ryota HIGUCHI,望月 正人,Masahito MOCHIZUKI,豊田 政男,Masao TOYODA
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This study proposes numerical analysis model considering grain boundary slip and microscopic h eterogeneity in order to estimate stress distribution which effect crack initiation and propaga tion. The FEM-MD combined method for considering grain boundary slip is discussed. The estimat ion of mechanical properties for taking account of microscopic heterogeneity is also discussed....
英字タイトル:
Development of Numerical Analysis Model considering Grain Boundary Slip and Microscopic Heterogeneity for the Evaluation of Crack Initiation and Propagation
第2回
イオン照射によるセラミックス強度の耐照射特性評価
著者:
池田 進一郎,Shinichiro IKEDA,檜木 達也,Tatsuya HINOKI,朴 環喚,KyeongHwan PARK,香山 晃,Akira KOHYAMA
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Strength of dense ceramics is basically determined by the defects near surface, while the damage introduced -y the ion irradiation is also limited to the near surface. The purpose of this study is to establish the simple valuation method of irradiation effect on mechanical property for ceramics by mean of flexural test after on irradiation instead of neutron irradiation. Flexural strength of CVD-SiC following ion irradiation ncreased in all condition, although the strength and Weibull modulus decreas ed wi...
英字タイトル:
Evaluation of Ion Irradiation Effect on Mechanical Properties of Ceramics
第2回
オンライン監視によるセンサーの点検周期判断支援技術
著者:
渡辺 長深,Osami WATANABE,林 宣宏,Nobuhiro HAYASHI,野村 真澄,Masumi NOMURA
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This paper introduces a new technique for supporting sensor inspection interval judgment by using an online sensor monitoring system for pressurized water reactor (PWR) plants. This system models the characteristics of the sensors just after the planned outage and monitors sensors during a plant operation b y predicting true value and evaluating just before the next planned outage sensor drifts that is difference between true value of a parameter and measured value of the sensor. The system can detect the ...
英字タイトル:
Sensor Inspection Interval Judgment Support Technique by Online Monitoring
第2回
クラッディング下部の欠陥検出 ECT プローブの開発
著者:
板羽 正浩,Masahiro ITABA,泉 康博,Yasuhiro IZUMI,橋本 光男,Mitsuo HASHIMOTO
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We examined the detection method of cracks in the lower layer of cladding of the nuc lear reactor pressure vessel, and tried an application of eddy current testing. The cladding processing produces noise by magnetic permeability. By this study, we devel oped a uniform eddy current probe aimed at detecting cracks of the pressure vessel....
英字タイトル:
Development of eddy current probe for crack detection under SUS cladding
第2回
スパッタ法によるセラミックス二層被覆ガラスの機械的特性
著者:
大友 隆史,Takafumi OTOMO,星出 敏彦,Toshihiko HOSHIDE
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Borosilicate glass was coated with Al2O3 and SiC by the radio frequency (RF) magnetron-sputtering method under various conditions. The mechanical properties of coated materials were investigated with respect to the sputtering conditions. The roughness, por osity and resistivity of surfaces of coated materials were measured, and the surface characteristics were clarified. The hardness of material coated with Al2O3 and SiC layer was measured by using a dynamic hardness tester. The hardness hardly depended on...
英字タイトル:
Mechanical Properties of Borosilicate Glass Coated with Two-Layered Ceramics by Sputtering
第2回
ナレッジマネージメントの観点からの保修支援知識の蓄積・流通の考察
著者:
仲谷 善雄,Yoshio NAKATANI
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This study proposes an innovative perspective for the knowledge accumulation and circulation in the domain of plant main tenance based on SECI model. The key concept of knowledge management is to make implicit knowledge to explicit, to share explicit knowledge among novice engineers, to develop explicit knowledge to advanced explicit knowledge, and to interna lize explicit knowledge as implicit. This paper is our first step to apply this framework to plant maintenance support....
英字タイトル:
Accumulation and Circulation of Maintenance Knowledge from A Viewpoint of Knowledge Management
第2回
パルス磁場 EMAT の開発と構造材料を対象とした状態監視への適用
著者:
大塚 裕介,Yusuke OHTSUKA,西川 雅弘,Masahiro NISHIKAWA
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A pulse electromagnetic acoustic transducer (pulse EMAT), with an induction coil replacing the conventional magnet, has been developed in order to increase transmission amplitude of ultrasonic waves. Us ing a pulse generator, a current of approximately 100 A was passed through the induction coil for 25 us, and a surface SH wave was transmitted during induction. As a result, the observed detection sign al for the pulse EMAT was 20% of that of an EMAT with a periodic permanent magnet (PPM) structure. The tim...
英字タイトル:
Development of EMAT with pulse electromagnet applied to condition based maintenance for constructive materials condition based maintenance for constructive materiais
第2回
プラント保守作業支援のための拡張現実感用トラッキング手法の開発
著者:
関山 友輝,Tomoki SEKIYAMA,中井 俊憲,Toshinori NAKAI,前嶋 真行,Masayuki MAESHIMA,下 志強,Zhigiang BIAN,石井 裕剛,Hirotake ISHII,下田 宏,Hiroshi SHIMODA,吉川 榮和,Hidekazu YOSHIKAWA
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1. はじめに近年、電力自由化に伴って、原子力発電に伴うコス ト削減が強く要求されるようになってきた。それに加 えて熟練作業員の減少が進んでいることや、さらには 後継者に保守作業の技術伝承を行っていくことの難し さも問題となっている。その一方で、発電設備自体の 高経年化や CBM(Condition Based Maintenance)の導入に よって、ますます保守作業のありかたは複雑になって きており、保守作業支援の高度化が望まれている。そこで、拡張現実感技術を利用して保守作業を支援 するシステムを利用......
英字タイトル:
Development of Tracking Method for Augmented Reality System for Plant Maintenance Support
第2回
ベイズ統計を用いた故障分布関数の更新
著者:
笠井 雅夫,Masao KASAI
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Abstract This study proposes the innovative method for evaluating the failure distribution functions that are essentially necessary to optimize the replacement interval of plant equipment. It is not easy to precisely evaluate the parameters of failure dis tribution functions since the enough failure data can not be easily obtained in Japanese plants. Then it is important to evaluate the confidence interval of the parameters of distribution functions to consider the risks due to the equipment failures. It i...
英字タイトル:
Revision of Failure Distribution Functions by Using Beyesian Statistics
第2回
マルテンサイト変態を利用した SUS304 鋼 溶接材中の真通疲労き裂の非破壊評価
著者:
中曽根 祐司,Yuji NAKASONE,岩崎 祥史,Yoshifumi IWASAKI,大橋 聡,Satoshi OHASHI
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The present study investigates plasticity-induced martensitic transformation around fatigue cracks in single V-groove butt-welded SUS304 plates at room temperature in air. Distributions of a' phase volume fraction Va around fatigue cracks were measured with ferrit e scope. The results were compared with the distributions of vertical magnetic flux density B, above fatigue cracks in welded specimens magnetized by a strong electromagnet. It was revealed that the B, distributions reflected the spatial distribu...
英字タイトル:
Non-Destructive Evaluation of Fatigue Cracks in SUS304 Stainless Steel Weldment by Using Plasticity-Induced Martensitic Transformation
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