第2回
Ni基合金溶接部の溶接条件が超音波探傷の欠陥検出に与える影響
著者:
西川 聡,Satoru NISHIKAWA,古川 敬,Takashi FURUKAWA,古村 一朗,Ichiro KOMURA,堀井 行彦,Yukihiko HORII
発刊日:
公開日:
キーワードタグ:
In order to study the influence of welding condition on the detectability of flaws in Ni based alloy by UT, we lding conditions, such as heat input, magnetic stirring and weaving were changed. Flaws in small heat input we ld joints was difficult to be detected because of the presence of high noise. On the contrary, welded joints m ade with large heat input and weaving showed lower noise and EDM notches in these joints were easily detected....
英字タイトル:
The Influence of Welding Condition on Flaw Detectability by Ultrasonic Test in Ni Based alloy welds.
第3回
Numerical Evaluation of ECT Signals of Cracks with Inclination
著者:
Weiying CHENG,Ichiro KOMURA
発刊日:
公開日:
キーワードタグ:
Some simplification models are proposed in order to sizing complicated shape defects practically, and the ECT signals of these simplified model cracks are calculated and the difference of ECT signal between the simplified models and i ts perpendicular to conductor surface counterparts is investigated phenomenally. The equivalency of depth sizing of t hese simplified models by using the method for its perpendicular to conductor surface counterparts is discussed also....
英字タイトル:
Numerical Evaluation of ECT Signals of Cracks with Inclination
第7回
Simulation for the Assessment of Wall Thinning using Eddy Current Method
著者:
程 衛英,Weiying CHENG,古村 一朗,Ichiro KOMURA
発刊日:
公開日:
キーワードタグ:
A pipe with protective lagging and thermal insulation is modeled by a multi-layered structure. Sinusoidal or sed eddy current are induced by a circular coil held above the structure to measure the thickness of the pipe 11. Analytical solutions of both sinusoidal and pulsed eddy c urrent measurements are deduced. Parameters ecting the measurement are studied using the analytical solutions. Measurement conditions are di scussed ed on the analytical results. Keywords: wall thinning, muti-layered structure, ed...
英字タイトル:
Simulation for the Assessment of Wall Thinning using Eddy Current Method
論文
ステンレス鋳鋼配管における超音波伝播シミュレーション
著者:
坂本 一信,Kazunobu SAKAMOTO,古川 敬,Takashi FURUKAWA,古村 一朗,Ichiro KOMURA,上山 芳教,Yoshinori KAMIYAMA,三原 毅,Tsuyoshi MIHARA
発刊日:
公開日:
キーワードタグ:
It is well known that volumetric inspection by ultrasonic testing for cast austenitic stainless steel (CASS) piping, which is extensively used in primary loop of Japanese pressurized water reactors (PWR), is challenging due to unexpected beam skewing, dispersion and attenuation by its coarse and anisotropic crystal structures resulted from manufacturing process. The miss or false calling of the flaws and the deterioration of sizing performance are of great concerns in the ultrasonic testing for the ma...
英字タイトル:
Simulation of Ultrasonic Wave Propagation in Cast Austenitic Stainless Steel Piping
第5回
パルスECT法による肉厚および導電率測定のシミュレーション
著者:
程 衛英,Weiying CHENG,古村 一朗,Ichiro KOMURA
発刊日:
公開日:
キーワードタグ:
A transient eddy current measurement method is presented to determine the thickness and conductivity of a conductive plate. The conductive plate is induced by an air-cored coil, the magnetic flux density along the axial is measured and the various signals corresponding to plates with dif ferent thickness and conductivity are calculated using a 3D transient eddy current simulator. Characteristic features are obtained from the tran sient response. A similarity-based modeling method is utilized in this study ...
英字タイトル:
Simulation of the Transient Eddy Current Measurement for the Characterization of Depth and Conductivity of a Plate
論文
原子炉再循環系配管のSCC深さサイジング技術
著者:
古川 敬,Takashi FURUKAWA,古村 一朗,Ichiro KOMURA,山下 裕宣,Hironobu YAMASHITA,徳間 英昭,Hideaki TOKUMA,福田 俊彦,Toshihiko FUKUDA
発刊日:
公開日:
1.はじめに国内の沸騰水型原子力発電設備の再循環系配管(以下PLR配管と記す)で使用されている低炭素オーステナイト系ステンレス鋼(以下SUS316L系材と記す)配 管の一部でひび割れが発見され、超音波探傷試験(以下UTと記す)による深さ測定が行われた。この測定に用いられたUT手法は、横波を用いた端部エコー法(以下従来UTと呼ぶ)を適用した。その後の金属調査の結果、ひび割れは応力腐食割れ(Stress CorrosionCracking 以下SCCと記す)であることが判明した。また従来UTで測定したひび割れ......
第7回
基調講演: EJAM New Technologyの活動状況
著者:
野本 敏治,Toshiharu NOMOTO,堂﨑 浩二,Koji DOZAKI,坂下 彰浩,Akihiro SAKASHITA,平野 伸明,Shinro HIRANO,大坪 徹,Tooru OOTSUBO,伊東 敬,Takashi ITO,宮口 仁一,Jinichi MIYAGUCHI,古村 一朗,Ichiro KOMURA,青木 孝行,Takayuki AOKI,中村 麻友,Mayu NAKAMURA,東原 奈美,Nami TOHARA
発刊日:
公開日:
キーワードタグ:
One year has passed since Electronic Journal of Advanced Maintenance (EJAM) was started on the website of Japan Society of M aintenology (ISM) May 25“, 2009. “New Technology' (NT) is one of the EJAM categories, and introduces widely advanced techniqu es developed or modified for maintenance. Twenty-two NT articles have been introduced on EJAM website so far as of May 25t“, 2010. This report describes the concept of NT, general features of NT articles, actual performance and future wishes for NT....
英字タイトル:
Current Status of EJAM ‘New Technology
論文
放射光CTによる原子炉材料のSCCき裂観察
著者:
中東 重雄,Shigeo NAKAHIGASHI,山本 厚之,Atsushi YAMAMOTO,寺澤 倫孝,Mititaka TERASAWA,梶原 堅太郎,Kentaro KAJIWARA,古村 一朗,Ichiro KOMURA,山口 篤憲,Atsunori YAMAGUCHI
発刊日:
公開日:
キーワードタグ:
We aimed to demonstrate the applicability of X-ray computer tomography (CT) with refractive contrast to the 3-dimensional (3D) imaging of minute cracks produced in weld metals of Ni-base alloy and austenitic stainless steel (SUS316L) caused by Stress Corrosion Cracking (SCC). The CT imaging experiments were performed at beam BL19B2 of SPring-8. The X-ray energy was adjusted to 37KeV using a Si double ? crystal monochromator. In summary, clear images of fine cracks in austenitic stainless steel due to ...
英字タイトル:
Detection of Cracks due to Stress Corrosion Cracking in Weld Metals of Nickel-base Alloys and Austenitic Stainless Steels by Synchrotron Radiation CT Imaging(
論文
渦電流探傷における欠陥形状復元のための新しい信号処理法
著者:
兼本 茂,Shigeru KANEMOTO,程 衛英,Weiying CHENG,志波 光晴,Mitsuharu SHIWA,古村 一朗,Ichiro KOMURA
発刊日:
公開日:
キーワードタグ:
This study proposes new signal processing methods to restore surface shapes of flaws from eddy current testing(ECT)signals. A linear discriminant analysis method is applied to ECT signals embedded in multi-dimensional state space to identify flaw signals form background noises in prior. A new concept of equivalent point spread function is introduced, and the real flaw shape is restored by utilizing a deconvolution filter based on Richardson-Lucy algorithm. An EDM notch covered by large welding noises...
英字タイトル:
New Signal Processing Methods for Surface Shape Restoration in Eddy Current
第10回
疲労割れの非破壊検査性能向上に必要な重要課題の抽出 Systematic Identification of Important Research Problems Necessary for Improving the
著者:
高木 敏行,Toshiyuki TAKAGI,青木 孝行,Takayuki AOKI,古村 一朗,Ichiro KOMURA,古川 敬,Takashi FURUKAWA,遊佐 訓孝,Noritaka YUSA,浦山 良一,Ryoichi URAYAMA
発刊日:
公開日:
キーワードタグ:
The PIRT process was developed as a part of the systematic and documented means of demonstrating the validation of best estimate simulation codes in USNRC licensing of nuclear power plants. In this paper the PIRT process was applied for finding influential factors giving an impact on the accuracy of ultrasonic testing and eddy current testing and related problems required to improve the accuracy and also reports the results that the problems were ranked from the viewpoint of importance, knowledge and c...
英字タイトル:
Accuracy of Non-destructive Examination Techniques to Detect Fatigue Crack