第16回
EMATによる超音波の送受信に関する電磁相互作用を考慮したFEMシミュレーション
著者:
山本 敏弘,(発電技検),浦山 良一,(東北大),古川 敬,(発電技検),高木 敏行,(東北大)
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The purpose of this study is to establish a computational procedure to support the optimization of an EMAT configuration. In this study, computer simulations were performed to obtain the propagation behavior of ultrasonic waves generated by an EMAT and the signals received with an EMAT. The simulation results were compared with the corresponding experimental results to validate the simulation method. The simulation results reasonably matched the corresponding experimental results....
英字タイトル:
FEM simulation with consideration of electromagnetic interaction for transmitting and receiving ultrasonic waves with an EMAT
第15回
Evaluation of general applicability of microwave NDT to pipes with a bend focusing on mode conversion
著者:
陳 冠任,片桐 拓也,遊佐 訓孝,橋爪 秀利,(東北大)
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This study evaluates the key factors impacting on multi-mode conversion of microwave when applying microwave NDT to bent pipe inspection. Mathematical derivation demonstrates the dependence of multi- mode conversion due to a bend on three factors: the ratio of bending radius to pipe’s diameter, the bend angle and the frequency normalized with the cut-off frequency of an arbitrary mode. To verify the deducting results, numerical simulations were conducted to evaluate multi-mode conversion of bent pipe adopti...
英字タイトル:
Evaluation of general applicability of microwave NDT to pipes with a bend focusing on mode conversion
第16回
Mechanism study of Directivity of TR probe for Eddy Current Testing of Magnetic Structural Material
著者:
Shurui ZHANG,Sho TAKEDA,Tetsuya UCHIMOTO,Toshiyuki TAKAGI,Mitsuo HASHIMOTO,Ziyue XU,(東北大),Yanzhen ZHAO,(西安交通大)
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Eddy Current Testing signals of the transmission/receiver (TR) type probe can be influenced by the directivity of the probe. In the previous study, ECT signal change due to scanning angle was evaluated in ferromagnetic material using a TR type probe, but the mechanism of the change is still not clear. In this study, ECT is conducted changing the orientation of the TR probe both on carbon steel and on austenitic stainless steel, to investigate the mechanism. The results show that the directivity of the probe...
第15回
Nondestructive Evaluation for Small Plastic Deformation and Deformation Histories in Reduced-activation Ferritic/Martensitic Steels
著者:
何 曼如,内一 哲哉,高木 敏行,(東北大),陳 振茂,(西安交通大)
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Magnetic Barkhousen Noise, Magnetic Incremental Permeability and Magnetic Flux Leakage methods are non-destructive evaluation methods for ferromagnetic materials. Reduced Activation Ferritic/Martensitic (RAFM) steel is a new kind of ferromagnetic material considered to be an important candidate structural material for thermal nuclear fusion reactors. The feasibility to use magnetic non-destructive evaluation techniques of MBN, MIP and MFL methods to evaluate the plastic strains in RAFM steel is experimental...
英字タイトル:
Nondestructive Evaluation for Small Plastic Deformation and Deformation Histories in Reduced-activation Ferritic/Martensitic Steels
第17回
Reliability analysis of pipes suffering wall thinning based on extreme value analysis of ultrasonic thickness measurement
著者:
宋 海成,遊佐 訓孝,(東北大)
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This study proposes to use extreme value analysis to characterize the uncertainty in estimating the wall thickness of carbon steel pipes by ultrasonic testing. The goodness of fit has been examined using experimental data measured from plate samples processed by corrosion test. A model is subsequently developed for predicting the failure probability of carbon steel pipes suffering wall thinning based on Bayesian theorem. In this model, the wall thinning rate predicted by KWU-KR model can be updated by offer...
英字タイトル:
Reliability analysis of pipes suffering wall thinning based on extreme value analysis of ultrasonic thickness measurement
第16回
Some Researches on UT and Laser Thermography for NDT Tokamak Plasma-Facing Components
著者:
陳 振茂,裴 翠祥,(西安交通大),内一 哲哉,高木 敏行,(東北大)
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During manufacturing and operation, delamination and surface cracks may be initiated in the plasma-facing components (PFCs) of Tokamak devices. To ensure the quality of the PFCs and safety of Tokamak, NDT techniques of different method are needed. This paper introduces recent researches of authors on UT and laser thermography techniques for inspection of PFCs during manufacturing and in-service. For W/Cu mono-block of divertors, the bonding quality was qualified by using the rotating UT with a focus probe. ...
英字タイトル:
Some Researches on UT and Laser Thermography for NDT Tokamak Plasma-Facing Components
第16回
インバリアント分析技術(SIAT)を利用したAE検査における異常判別の高度化
著者:
相馬 知也,(NECソリューションイノベータ),高木 敏行,内一 哲哉,(東北大)
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At present, AE(Acoustic Emission) measurement is positioned as one of nondestructive inspection methods, and is used to monitor, diagnose, and evaluate various mechanical systems, structures, and the like. AE measurement has the advantage of high sensitivity, wide band, and dynamic measurement, but on the other hand, it is susceptible to noise because it is high sensitivity. In addition, since it is easily affected by the measurement system such as the frequency characteristics of the sensor, advanced know-...
英字タイトル:
Advanced discrimination of anomalies in AE inspection using system invariant analysis technology (SIAT)
第15回
インバリアント分析技術(SIAT)を利用した非破壊検査の高度化
著者:
相馬 知也,(NEC),高木 敏行,内一 哲哉,蔡 世超,(東北大)
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In non-destructive inspection, the probability of abnormality finding in image diagnosis, ECT inspection and so on depends mostly on skills of individuals. Therefore, training of inspectors is an important issue in the maintenance and management of facilities. This study aims at improving accuracy in nondestructive inspection by applying System Invariant Analysis Technology (SIAT) which is one of big data analysis techniques. The feasibility is confirmed by the experiment using ECT this time and it is repor...
英字タイトル:
Advanced nondestructive inspection using System Invariant Analysis Technology (SIAT)
第16回
オーステナイト系ステンレス鋼溶接金属の衝撃特性に及ぼす熱時効の影響評価
著者:
阿部 博志,黒山 結音,渡邉 豊,(東北大)
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Austenitic stainless steel welds typically have duplex microstructure with a few to over 10 % of 8-ferrite in austenite to prevent hot cracking during solidification. Therefore, austenitic stainless steel welds are also susceptible to thermal aging embrittlement similar with cast duplex stainless steels (CDSSs). Although microstructural morphologies of 8-ferrite in austenitic stainless steel welds is different from that of CDSSs, the effect of that on an thermal aging embrittlement behavior is not fully kno...
英字タイトル:
Effect of thermal aging on impact behavior of austenitic stainless steel welds
第15回
コンクリート構造物のASR診断方法に関する評価
著者:
江藤 淳二,(三菱総研),五十嵐 豪,(東北大),小川 彰一,渋谷 和俊,(太平洋コンサルタント),丸山 一平,(名古屋大学),山田 一夫,(国立環境研究所),滝沢 真之,(三菱総合研究所)
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Recently, many concrete structures such as bridge piers of the highway, damaged by Alkali Silica Reaction (ASR) have been observed in Japan. From this background, based on the latest knowledge of domestic and international, the ASR diagnostic method that emphasizes the petrological examination after the core sampling was proposed on Japan Nuclear Energy Safety Organization (JNES) report. In this research, in order to confirm the effectiveness of ASR diagnostic method for concrete structures proposed in JNES...
英字タイトル:
Evaluation on ASR diagnostic method for concrete structures