87件が見つかりました。

並び替え
第9回
316系低炭素ステンレス鋼溶接金属の BWR 炉水温度域における熱時効脆化の評価
著者:
阿部 博志,Hiroshi ABE,渡辺 豊,Yutaka WATANABE,寺尾 俊彦,Toshihiko TERAO
発刊日:
公開日:
キーワードタグ:
To evaluate the rate of thermal embrittlement of type 316 low-carbon stainless steel weld metal at BWR operating temperature, aging test at 310°C, 335°C, and 400°C was carried out. Hardness of each ferrite and austenite phase of s pecimens was measured selectively by microhardness tester. Hardness of ferrite was increased apparently with all three aging temperatures, whereas hardness of austenite was not changed. Changes in the microstructure of ferrite ag ed at 310°C for 11,000h and 18,000h were analyzed ...
英字タイトル:
Evaluation of aging embrittlement of low-carbon austenitic stainless steelweld metal near the BWR operating temperature
第9回
9Cr-1Mo 鋼溶接部の微視組織の内部拘束を考慮した異方性クリープ解析
著者:
中曽根 祐司,Yuji NAKASONE,岡 篤史,Atsushi OKAMI
発刊日:
公開日:
キーワードタグ:
Modified 9Cr-Mo steel is a candidate structural steel for demonstration fast breeder reactors (FBR's). Due to low thermal activatio n, the steel can maintain steady-state deformation during long-term creep. The creep strength of its weldment is lower than that of the base metal. Because of different creep strain rate in the solidified weld metal and heat-affected zone (HAZ), creep deformation in HAZ can be lowered but maximum principal stress augmented in fine-grained HAZ to cause detrimental Type IV crack...
英字タイトル:
FEM Analyses of Creep in Welded Modified 9Cr -1 Mo Steel Considering Constraint Effects Induced by Anisotropic Microstructures
第9回
AE法による低速転がり軸受の診断技術
著者:
迫 孝司,Takashi SAKO,岩崎 俊二,Shunji IWASAKI,金子 修一,Syuichi KANEKO
発刊日:
公開日:
キーワードタグ:
Abstract Most of low speed rotating equipments includes large important equipments, and an equipment stoppage caused by damage of rolling element bearing brings significant losses to a plant. This paper relates to a diagnostic method of rolling element bearing in low speed rotating equipment of 100 rpm or less, and proposes a method to diagnose using AE envelope waveform of a 100 k to 1 MHz frequency region. Abnormal ity diagnosis wasafter envelope processing in addition to amplification of AE waveform. Fu...
英字タイトル:
Diagnosis of Low Speed Rolling Element Bearing by AE Method.
第9回
Application of Microwaves on Remote and Nondestructive Testing of both Biofouling and Wall Thinning inside a Metal Pipe
著者:
劉 臨生,Linsheng LIU,佐々木 幸太,Kota SASAKI,遊佐 訓孝,Noritaka YUSA,橋爪 秀利,Hidetoshi HASHIZUME
発刊日:
公開日:
キーワードタグ:
The authors have already proposed microwave nondestructive testing (NDT) method on detecting both location and degree of a pipe wall thinning (PWT) inside a metal pipe. However, problems caused by iofouling inside metal pipes are also frequ ently reported in recent years. As the existence of biofilm inside a aveguide will change its wave impedance and also cause microwave reflections, the characteristic signals of iofilm defects are studied here to distinguish the biofilm and PWT defects. A pair of coaxial...
英字タイトル:
Application of Microwaves on Remote and Nondestructive Testing of both Biofouling and Wall Thinning inside a Metal Pipe
第9回
BWR炉内構造物点検評価ガイドライン 炉内配管の点検困難部位の欠陥想定法
著者:
伊東 敬,Takashi ITO,堂崎 浩二,Kouji DOZAKI,黒田 光,Hikaru KURODA,磯 敦夫,Atsuo ISO,関 弘明,Hiroaki SEKI
発刊日:
公開日:
キーワードタグ:
According to the past edition of “Guideline of Inspection and Evaluation for Core Internals (Core Spray Sparger & Piping Jet Pum p]” issued by Japan Nuclear Technology Institute (JANTI), fully penetrated flaw should be assumed for uninspected region, for ev aluating their integrity. This assumption was considered to be too conservative. Then, this study was performed on the better as sumption of flaw existence in the uninspected region to develop more appropriate flaw modeling by using statistical evaluati...
英字タイトル:
The Guideline of BWR Inspection Program Study on Flaw Characterization of Core Internals Piping for Uninspected Region
第9回
Development of motion image prediction method using principal componentanalysis
著者:
Ritu Bhusal Chhatkuli, Kazuyuki Demachi,Masaki Kawai,Hiroshi Sakakibara,Kazuma Kamiaka
発刊日:
公開日:
キーワードタグ:
Respiratory motion can induce the limit in the accuracy of area irradiated during lung cancer radiation therapy. Many methods have been introduced to minimize the impact of healthy tissue irradiation due to the lung tumor mot ion. The purpose of this research is to develop an algorithm for the improvement of image guided radiation therapy by the prediction of motion images. We predict the motion images by using principal component analysis (PCA) a nd multi-channel singular spectral analysis (MSSA) method. ...
英字タイトル:
Development of motion image prediction method using principal componentanalysis
第9回
EMAT の磁性体内における超音波発生メカニズムのシミュレーション
著者:
伊藤 崇文,Takafumi ITO,小島 史男,Fumio KOJIMA
発刊日:
公開日:
キーワードタグ:
This paper is concerned with mechanism of ultrasonic test signals in magnetic materials using electromagnetic acoustic transducer(EMAT). The co upling mechanism between the electromagnetic fields and the applied excitation of ultrasonic testing are investigated. First, a nonlinear magnetic mod el in two dimensions is presented for the coupling mechanism. Secondly, the coupling mechanisms in ferromagnetic materials are studied analytically an d numerically. The final part of this monograph is devoted to num...
英字タイトル:
Simulation on mechanism of ultrasonic test signals in magnetic materialsusing EMAT
第9回
Investigation on electromagnetic characteristics numerical simulation by eddy current testing
著者:
王 晶, 遊佐 訓孝, Noritaka YUSA, 潘 紅良,橋爪 秀利,Hidetoshi HASHIZUME, Mika KEMPPAINE,Nlikka VIRKKUNEN
発刊日:
公開日:
キーワードタグ:
The present study discusses electromagnetic characteristics of modeling thermal fatigue crack in numerical simulation from view point of eddy current testing. Two thermal fatigue cracks introduced into SUS304 stainless steel plates are investigated. Eddy current signals are gathered by a differential plus point probe with several frequencies, 50 kHz, 100 kHz and 400 kHz. In the numerical simulation thermal fatigue crack is modeled as a region with constant width, true profile revealed by results of destruc...
英字タイトル:
Investigation on electromagnetic characteristics numerical simulation by eddy current testing
第9回
Laser-EMAT ultrasonic testing of cracks with TOFD method
著者:
Cuixiang Pei,Tetsuo Fukuchi,Kazuyuki Demachi,Kazuyoshi Koyama,Mitsuru Uesaka
発刊日:
公開日:
キーワードタグ:
Abstract: A hybrid, noncontact laser-EMAT ultrasonic system, using a pulsed laser for ultrasound generation and an EMAT (electromagnetic acousti c transducer) for ultrasound detection, is developed and studied on NDT of crack in materials. Instead of using longitudinal diffraction wave i n the conventional TOFD method, the LTS mode-converted wave scattered from the crack tip is recommended to be applied in the laser-EMAT TOFD mea surement. A modified time-of-flight (TOFD) method based on laser-EMAT ultraso...
英字タイトル:
Laser-EMAT ultrasonic testing of cracks with TOFD method
第9回
On-Site Bridge Inspection with Partial CT by 3.95Mev X-Band Linac Source
著者:
WU Wenjing,ZHU Haito,JIN Ming,Katsuhiro DOBASHI,Takeshi FUJIWARA,Mitsuru UESAKA,Jyuichi KUSANO,Naoki NAKAMURA,Eiji TANABE,Hideyuki SUNAGA,Yoshie OHTAKE
発刊日:
公開日:
キーワードタグ:
Abstract: Since more and more bridges built several decades ago in Japan have become aged and dangerous, the non-destructive evaluation of those bridges is really an urgent problem. CT system with portable 3.95MeV linacs for bridge inspection is considered to work on-site, considering the law of Japanese radiation protection allows using linacs up to 4MeV outside radiation controlled area. The system would confirm the internal steel si tuation of bridges and analyze structural strain and stress with 3D mod...
英字タイトル:
On-Site Bridge Inspection with Partial CT by 3.95Mev X-Band Linac Source