第3回
Electromagnetic Property Evaluation on HAZ and Base Metal of Modified 9Cr-1Mo steel by Eddy Current Method
著者:
Haiyan TIAN,Tetsuya UCHIMOTO,Toshiyuki TAKAGI,Yukio TAKAHASHI
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Eddy-current method is applied to evaluate electromagnetic properties of modified 9Cr-1 Mo steel used in power plants in order to investigate the material changes in heat affected zone (HAZ) and base metal in Type IV damage evaluation. A pancake-coil impedance model based on eddy current theory is proposed to evaluate conductivity and permeability of conducting mat erial. Further more a series of HAZ and base specimens of Modified 9Cr-1 Mo steel in different heat treatment conditions are experimentally mea...
英字タイトル:
Electromagnetic Property Evaluation on HAZ and Base Metal of Modified 9Cr-1Mo steel by Eddy Current Method
第12回
Reliability Assessment for Electromagnetic Acoustic Resonance (EMAR) and Pulse-EMAR Methods by Statistical
著者:
Shuxiao XIE ,Ryoichi URAYAMA,Tetsuya UCHIMOTO,Toshiyuki TAKAGI
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Abstract: This study proposes a reliability assessment method for two pipe wall thickness inspection techniques, the electromagnetic acoustic resonance (EMAR) and pulse-EMAR methods, using statistical analysis. The statistical analysis uses an EMAR technique with a signal processing method called the superposition of nth compression (SNC) method, which is used to calculate the normalized SNC peak value, and is concerned with the difference between the thicknesses obtained by the EMAR method and the rea...
英字タイトル:
Reliability Assessment for Electromagnetic Acoustic Resonance (EMAR) and Pulse-EMAR Methods by Statistical
第11回
Reliability evaluation of Fatigue crack signal in austenite stainless steels 佐藤 打美亥 Dummy SATOU
著者:
Hao FENG,Ryoichi URAYAMA,Tetsuya UCHIMOTO,Toshiyuki TAKAGI
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Abstract..This paper investigates the influence of machining process on eddy current signals of fatigue cracks in low carbon austenite stainless steels. Several fatigue cracks are created using four point bending method. The grinding process on crack mouth after the formation of fatigue crack seals the crack and gives certain amount of conductivity. This phenomenon on fatigue cracks is confirmed through comparison with the numerical simulation of ECT signals. ...
英字タイトル:
Reliability evaluation of Fatigue crack signal in austenite stainless steels 佐藤 打美亥 Dummy SATOU
第1回
BWR 環境下での渦電流モニタリングによる In-situ き裂進展評価の検討
著者:
糟谷 高志,Takashi KASUYA,奥山 武志,Takeshi OKUYAMA,遠藤 久,Hisashi ENDO,内一 哲哉,Tetsuya UCHIMOTO,高木 敏行,Toshiyuki TAKAGI,庄子 哲雄,Tetsuo SHOJI
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Abstract This paper discusses the possibility of in-situ evaluation of crack propagation using Eddy Current Monitoring (ECM) system in a Boiling Water Reactor (BWR) environment. For the purpose, an ECM experiment was conducted at the System Safety Benchma rk Facility (SSBF). The target for the monitoring was a large-scale pipe specimen made of austenitic stainless steels 304L, 316L, and carbon steel STS410, connected by weld joints of nickel based alloy 182. Slits were prepared at the Heat Affected Zones (...
英字タイトル:
In-situ Crack Evaluation using Eddy Current Monitoring in a Boiling Water Reactor Environment
第7回
Defects Sizing Using a Pulsed Eddy Current Testing Method for Local Wall-Thinning Evaluation
著者:
Shejuan XIE Student,Toshiyuki TAKAGI,Tetsuya UCHIMOTO
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The thickness of a plate is to be evaluated Introductionfrom the top surface of the plate. Keywords: Local wall-thinning, Pulsed ECT, Magnetic sensor, Feature extraction, Sizingand width. The thickness of a plate is to be evaluated from the top surface of the plate.To simulate the small area wall-thinning on the inner surface of a pipe, five AISI316 austenitic stainless steel flat plates with a slot defect were prepared in our ex periments. The size of the five plates is the same, 120mm in length, 100mm i...
英字タイトル:
Defects Sizing Using a Pulsed Eddy Current Testing Method forLocal Wall-Thinning Evaluation
第2回
Development of Eddy Current Monitoring System andIts Application to Crack Propagation Monitoring
著者:
Toshiyuki TAKAGI,Takashi KASUYA,Hisashi ENDO,Tetsuya UCHIMOTO
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This paper describes the feasibility of Eddy Current Monitoring (ECM) system as an in-situ evaluation method of crack propagation in a Boiling Water Reactor (BWR) environment. For the purp ose, we explain an ECM experiment conducted at a System Safety Benchmark Facility (SSBF) with a large-scale austenitic stainless steel pipe specimen. Several slits were prepared at the Heat Affected Zones (HAZS) and weld lines from the inner surface. After exerting the load, Eddy Current Testing (ECT) probes attached on ...
英字タイトル:
Development of Eddy Current Monitoring System andIts Application to Crack Propagation Monitoring
論文
ECTに基づくシュラウドの検査シミュレーション
著者:
糟谷 高志,Takashi KASUYA,内一 哲哉,Tetsuya UCHIMOTO,高木 敏行,Toshiyuki TAKAGI,黄 皓宇,Haoyu HUANG
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This paper discusses the feasibility of shroud inspections using Eddy Current Testing (ECT). For the purpose, the three steps of simulations were carried out. At first, the propagation of postulated cracks in the H4 weld line of the shroud was estimated. Subsequently, the eddy current signals were numerically simulated based on the reduced vector potential method. At last, the inverse analyses were performed using simulated ECT signals, and crack shapes were reconstructed. The high accuracy of crack reconst...
英字タイトル:
Simulation of Shroud Inspection based on Eddy Current Testing
第13回
Evaluation of the Influence of Fatigue Crack Closure on Eddy Current Testing Signals
著者:
,XiaoYang WU,,Tetsuya UCHIMOTO,,Toshiyuki TAKAGI,,Ryoichi URAYAMA
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In the previous study, it has been found that amplitude of ECT signal of fatigue cracks which are introduced in type 316 and 316L austenite stainless steels decrease after heat treatment. As the result, evaluation of the ECT signals with error leads to the underestimation of fatigue cracks sizing. In this study, the relation between loading conditions of fatigue test and ECT signal change is investigated, in order to figure out the phenomenon. The results show the amplitude change of eddy current is rel...
英字タイトル:
Evaluation of the Influence of Fatigue Crack Closure on Eddy Current Testing Signals
第6回
Impedance analysis of eddy current fields on inhomogeneous conductive medium with stress corrosion cracks
著者:
Taishi Okita, Toshiyuki Takagi, Tetsuya Uchimoto
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We numerically compute the impedance of the probe-coil as an eddy-current signal due to stress corrosion cracks (SCC) and/or fatigue cracks in the conductive an d nonmagnetic materials by using 3D finite element model. The fine shallow cracks with various structures are self-consistently simulated by providing zero-condu ctivity with a part of the background materials. We find the significant difference in the coil impedance, which crucially depends on the crack geometries. Our model and the obtained resu...
英字タイトル:
Impedance analysis of eddy current fields on inhomogeneous conductive mediumwith stress corrosion cracks
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...