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< Page ,Total 23 >
A study on influence of magnetic field on fracture of ferromagnetic material due to magneto-mechanical coupling effects SCIE
期刊论文 | 2019 , 59 (1) , 235-245 | INTERNATIONAL JOURNAL OF APPLIED ELECTROMAGNETICS AND MECHANICS
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Abstract :

The influence of magnetic field on stress intensity factor at crack tips of a ferromagnetic material is studied in this paper. A method using a sequential coupling algorithm has been applied to solve this coupled problem explicitly. In order to realize the iterative calculation of the stress intensity factor, a semi-analytical solution of the magnetic field perturbation due to structural deformation near by the crack tips is derived at first. The Maxwell stress, the magnetostriction strain and the nonlinear mechanical property of the magnetic material are taken into consideration to cope with the magneto-mechanical coupling effects. Results of perturbed magnetic field and distribution of magnetostriction strain at the crack tip are obtained and being evaluated quantitatively. Finally, the effects of the applied external magnetic field on stress intensity factor of a crack in a ferromagnetic material are discussed based on the numerical results.

Keyword :

magnetostriction effect Magnetoelastic ferromagnetic material stress intensity factor

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GB/T 7714 Xie, Zheng , Shi, Pengpeng , Li, Qun et al. A study on influence of magnetic field on fracture of ferromagnetic material due to magneto-mechanical coupling effects [J]. | INTERNATIONAL JOURNAL OF APPLIED ELECTROMAGNETICS AND MECHANICS , 2019 , 59 (1) : 235-245 .
MLA Xie, Zheng et al. "A study on influence of magnetic field on fracture of ferromagnetic material due to magneto-mechanical coupling effects" . | INTERNATIONAL JOURNAL OF APPLIED ELECTROMAGNETICS AND MECHANICS 59 . 1 (2019) : 235-245 .
APA Xie, Zheng , Shi, Pengpeng , Li, Qun , Chen, Zhenmao . A study on influence of magnetic field on fracture of ferromagnetic material due to magneto-mechanical coupling effects . | INTERNATIONAL JOURNAL OF APPLIED ELECTROMAGNETICS AND MECHANICS , 2019 , 59 (1) , 235-245 .
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Analysis of magnetic flux perturbation due to conductivity variation in equivalent stress-corrosion crack SCIE
期刊论文 | 2019 , 59 (4) , 1385-1392 | INTERNATIONAL JOURNAL OF APPLIED ELECTROMAGNETICS AND MECHANICS
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Abstract :

The purpose of this study is to characterize the features of magnetic flux density perturbation as a result of the variation of conductivity in an equivalent model of the stress-corrosion crack (SCC). By using numerical computation of A-phi method, the magnetic field nearby the inspection target was simulated for an eddy current probe of large rectangular excitation coil and a conductor plate with a modeled SCC. A conductive notch was set in the center of the conductor plate as an equivalent crack model of a real SCC. Different conductivities and crack depths were varied into the equivalent SCC model for analyzing their influences to the distribution of magnetic flux density perturbation above the model plate. Numerical results showed that the distributions of magnetic flux density were suitable to distinguish the difference of the conductivities of the SCC between 0% and 20% of the base material for normal testing frequencies. In addition, it was also found that the profile of distributed conductivity along the crack length can be better represented with the field induced by the excitation current laterally to the crack length.

Keyword :

Magnetic flux distribution equivalent conductivity eddy current testing stress corrosion crack

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GB/T 7714 Jomdecha, Cherdpong , Cai, Wenlu , Xie, Shejuan et al. Analysis of magnetic flux perturbation due to conductivity variation in equivalent stress-corrosion crack [J]. | INTERNATIONAL JOURNAL OF APPLIED ELECTROMAGNETICS AND MECHANICS , 2019 , 59 (4) : 1385-1392 .
MLA Jomdecha, Cherdpong et al. "Analysis of magnetic flux perturbation due to conductivity variation in equivalent stress-corrosion crack" . | INTERNATIONAL JOURNAL OF APPLIED ELECTROMAGNETICS AND MECHANICS 59 . 4 (2019) : 1385-1392 .
APA Jomdecha, Cherdpong , Cai, Wenlu , Xie, Shejuan , Li, Yong , Chen, Zhenmao . Analysis of magnetic flux perturbation due to conductivity variation in equivalent stress-corrosion crack . | INTERNATIONAL JOURNAL OF APPLIED ELECTROMAGNETICS AND MECHANICS , 2019 , 59 (4) , 1385-1392 .
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Evaluation of electromagnetic force in tokamak first wall based on magnetic field measurement and inverse analysis SCIE
期刊论文 | 2019 , 59 (2) , 427-437 | INTERNATIONAL JOURNAL OF APPLIED ELECTROMAGNETICS AND MECHANICS
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Abstract :

Electromagnetic force due to induced eddy current during plasma disruptions is one of the key design-driving issues for the first wall (FW) in the Tokamak device. In this paper, a method to evaluate the electromagnetic force in the FW is proposed based on inversion of the measured magnetic field. An inversion scheme for reconstruction of eddy current from measured magnetic field is developed based on a newly proposed algorithm that can eliminate the effect of plasma current. To solve this inverse problem, the conjugate gradient (CG) algorithm is adopted in addition with an efficient parameterization strategy of eddy current distribution. To demonstrate the efficiency of the method, a simplified FW plate and plasma current model is considered with the magnetic field simulated with a numerical code of the reduced magnetic vector potential (Ar) formulation. The numerical results show that proper eddy current and electromagnetic force distribution can be predicted even for case of unknown plasma current, which reveals that the proposed method has good potential to be applied to the electromagnetic force evaluation of practical Tokamak problem.

Keyword :

first wall Electromagnetic force eddy current reconstruction inverse analysis

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GB/T 7714 Wang, Kaiqiang , Xie, Shejuan , Li, Shiyang et al. Evaluation of electromagnetic force in tokamak first wall based on magnetic field measurement and inverse analysis [J]. | INTERNATIONAL JOURNAL OF APPLIED ELECTROMAGNETICS AND MECHANICS , 2019 , 59 (2) : 427-437 .
MLA Wang, Kaiqiang et al. "Evaluation of electromagnetic force in tokamak first wall based on magnetic field measurement and inverse analysis" . | INTERNATIONAL JOURNAL OF APPLIED ELECTROMAGNETICS AND MECHANICS 59 . 2 (2019) : 427-437 .
APA Wang, Kaiqiang , Xie, Shejuan , Li, Shiyang , Shi, Pengpeng , Tian, Shuxia , Chen, Zhenmao . Evaluation of electromagnetic force in tokamak first wall based on magnetic field measurement and inverse analysis . | INTERNATIONAL JOURNAL OF APPLIED ELECTROMAGNETICS AND MECHANICS , 2019 , 59 (2) , 427-437 .
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Detection of surface cracks by laser spot thermography at elevated temperature SCIE
期刊论文 | 2019 , 59 (4) , 1553-1559 | INTERNATIONAL JOURNAL OF APPLIED ELECTROMAGNETICS AND MECHANICS
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Abstract :

The laser array spots thermography (LAST) is a new fully non-contact and non-destructive method for inspection of surface cracks. In this study, the capability of this method for inspection of surface crack in specimen at elevated temperature is investigated. The temperature distributions in a specimen at different initial temperature are calculated through simulation and measured through experiment, respectively. Both the simulation and experimental results show that the background noise in the temperature distribution will be increased when the initial temperature of the specimen is enlarged. However, with the aid of an image processing method, the surface cracks in the specimen with initial temperature from 303 K to 573 K are successfully detected by using the LAST method.

Keyword :

surface cracks Laser array spots thermography elevated temperature non-destructive testing

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GB/T 7714 Qiu, Jinxing , Pei, Cuixiang , Liu, Haochen et al. Detection of surface cracks by laser spot thermography at elevated temperature [J]. | INTERNATIONAL JOURNAL OF APPLIED ELECTROMAGNETICS AND MECHANICS , 2019 , 59 (4) : 1553-1559 .
MLA Qiu, Jinxing et al. "Detection of surface cracks by laser spot thermography at elevated temperature" . | INTERNATIONAL JOURNAL OF APPLIED ELECTROMAGNETICS AND MECHANICS 59 . 4 (2019) : 1553-1559 .
APA Qiu, Jinxing , Pei, Cuixiang , Liu, Haochen , Chen, Zhenmao . Detection of surface cracks by laser spot thermography at elevated temperature . | INTERNATIONAL JOURNAL OF APPLIED ELECTROMAGNETICS AND MECHANICS , 2019 , 59 (4) , 1553-1559 .
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Influence of tensile stress on hysteresis loop of Reduced Activation Ferrite & Martensitic steel EI SCIE
期刊论文 | 2019 , 515 , 28-34 | Journal of Nuclear Materials
WoS CC Cited Count: 1
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Abstract :

The influence of tensile stress on hysteresis loop of Reduced Activation Ferrite & Martensitic steel (RAFM steel) in elastic region was quantitatively evaluated through experiments in this paper. In view of in vessel structures of the RAFM steel in the Tokamak devices, the variation of magnetic material properties caused by forces or mechanical deformation may lead to unexpected influences on their dynamical behaviors, even safety problem. In this paper, tensile experiments of a RAFM steel were conducted under magnetic field up to 60 kA/m to measure its hysteresis loops under different tensile stress. Tensile specimens of a RAFM steel developed in China (CLAM steel) were fabricated and measured with a multi-field coupling experimental system. The maximum relative permeability under different experimental conditions was extracted from the measured hysteresis loops. Experimental results show that a clear variation of the maximum magnetic permeability was observed when the external tensile stress was enlarged. In addition, based on a linear theory of magneto-solid coupling mechanics, a model of constitutive relation between tensile stress and maximum magnetic permeability was put forward and validated based on the experimental results. © 2018 Elsevier B.V.

Keyword :

Constitutive relations Experimental conditions Experimental system In-vessel structures Mechanical deformation Multi-field coupling Rafm steels Relative permeability

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GB/T 7714 Xie, Zheng , Zhao, Yingsong , Bai, Peigen et al. Influence of tensile stress on hysteresis loop of Reduced Activation Ferrite & Martensitic steel [J]. | Journal of Nuclear Materials , 2019 , 515 : 28-34 .
MLA Xie, Zheng et al. "Influence of tensile stress on hysteresis loop of Reduced Activation Ferrite & Martensitic steel" . | Journal of Nuclear Materials 515 (2019) : 28-34 .
APA Xie, Zheng , Zhao, Yingsong , Bai, Peigen , Li, Qun , Pei, Cuixiang , Chen, Hongen et al. Influence of tensile stress on hysteresis loop of Reduced Activation Ferrite & Martensitic steel . | Journal of Nuclear Materials , 2019 , 515 , 28-34 .
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A Method for Diagnosis of Poloidal Field Coils' Current Based on Inversion of Magnetic Field EI SCIE CPCI-S Scopus
会议论文 | 2018 , 46 (6) , 2307-2313 | 27th IEEE Symposium on Fusion Engineering (SOFE)
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Abstract :

Tokamak devices such as ITER, EAST, and HL-2M have been designed and constructed (or under construction) to challenge the magnetic-confined nuclear fusion technology for the sustainable energy problem of human beings. The magnet system of the tokamak devices is mainly composed with poloidal field (PF) coils, toroidal field (TF) coils, and central solenoid coils. Among them, the PF coils play a key role in adjusting the confining magnetic field for the control of the fusion plasma. In order to avoid the plasma disruption, it is necessary to know the correlation of the magnetic field in a vacuum vessel (VV) with the current in PF coils and to predict the current distribution of PF coils which can generate a required configuration of confining magnetic field. In this paper, taking the HL-2M tokamak device as an example, an inverse analysis scheme to predict and identify the perturbation of current in PF coils from the target magnetic field signals in the VV was proposed. First, based on the Biot-Savart law, a forward code to calculate the magnetic field due to PF coil currents and TF coil currents was developed. Second, an inversion code to predict and identify current distribution in PF coils from the target magnetic field was developed based on the conjugate gradient optimization method and the singular value decomposition method. The validity of the proposed inversion scheme and the corresponding numerical codes was investigated by reconstructing PF coil current distributions from several groups of perturbed magnetic fields. In addition, the effect of the measurement points and the measurement noises on the reconstruction results was also discussed. Finally, a simplified experiment on a coil system was conducted to verify the validity and efficiency of the proposed forward and inversion analysis code.

Keyword :

Current distribution inverse problem magnetic field tokamaks

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GB/T 7714 Tian, Shuxia , Huang, Zichu , Wang, Yongxiang et al. A Method for Diagnosis of Poloidal Field Coils' Current Based on Inversion of Magnetic Field [C] . 2018 : 2307-2313 .
MLA Tian, Shuxia et al. "A Method for Diagnosis of Poloidal Field Coils' Current Based on Inversion of Magnetic Field" . (2018) : 2307-2313 .
APA Tian, Shuxia , Huang, Zichu , Wang, Yongxiang , Chen, Zhenmao . A Method for Diagnosis of Poloidal Field Coils' Current Based on Inversion of Magnetic Field . (2018) : 2307-2313 .
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Development of a Fast Numerical Simulator for Infrared Thermography Testing Signals of Delamination Defect in a Multilayered Plate EI Scopus SCIE
期刊论文 | 2018 , 14 (12) , 5544-5552 | IEEE Transactions on Industrial Informatics
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Abstract :

In this paper, a very fast numerical solver for simulating signal perturbation of infrared thermography testing (IRT) due to delamination defects was developed by using database of unflawed IRT information. Firstly, the IRT signal simulation method of the frequency domain summation scheme proposed by authors is briefly introduced as the bases of the present fast forward solver. Second, a database-type fast numerical scheme for rapid simulation of single frequency IRT harmonic signals was proposed to enhance the efficiency of the IRT simulation without worsening the numerical precision. In addition, in order to efficiently implement the proposed fast solver for simulation of delamination defects in a multilayered plate, a 2D shifting symmetry strategy was applied to reduce the computational burden for the construction of the unflawed database. Based on the proposed scheme, a fast forward numerical code was developed for simulation of IRT signal perturbation due to the delamination defect. The validity of the proposed scheme and the corresponding numerical code was verified by comparing its results with those of a full-FEM code and experiments. It was demonstrated that the database-type fast scheme can significantly reduce the simulation time for the IRT signal perturbation due to a delamination defect but keep the same simulation accuracy with that of the full-FEM code. IEEE

Keyword :

Computational burden Computational model Database approaches Delamination defects Fast forward solvers Multi-layered plates Numerical simulators Simulation accuracy

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GB/T 7714 Haochen, Liu , Xie, Shejuan , Pei, Cuixiang et al. Development of a Fast Numerical Simulator for Infrared Thermography Testing Signals of Delamination Defect in a Multilayered Plate [J]. | IEEE Transactions on Industrial Informatics , 2018 , 14 (12) : 5544-5552 .
MLA Haochen, Liu et al. "Development of a Fast Numerical Simulator for Infrared Thermography Testing Signals of Delamination Defect in a Multilayered Plate" . | IEEE Transactions on Industrial Informatics 14 . 12 (2018) : 5544-5552 .
APA Haochen, Liu , Xie, Shejuan , Pei, Cuixiang , Qiu, Jinxing , Li, Yong , Chen, Zhenmao . Development of a Fast Numerical Simulator for Infrared Thermography Testing Signals of Delamination Defect in a Multilayered Plate . | IEEE Transactions on Industrial Informatics , 2018 , 14 (12) , 5544-5552 .
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Investigation of Electromagnetic Properties of 304 Austenitic Stainless Steel with Plastic Deformation and Fatigue Damage and Microstructure Analysis EI CSCD Scopus PKU
期刊论文 | 2018 , 33 (14) , 3170-3176 | Diangong Jishu Xuebao/Transactions of China Electrotechnical Society
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Abstract :

Plastic deformation and fatigue damage, as the typical micro-damage caused by external loads such as earthquake and long-term process of liquid flow/stress, may seriously affect the material electromagnetic properties and shorten the structural lifespan. In this study, first, the test pieces suffering from plastic deformation and fatigue damage are fabricated using MTS testing machine, respectively. Second, the correlation between the electromagnetic properties of the material and the plastic deformation/fatigue damage is investigated for 304 austenitic stainless steel. Finally, the mechanism is discussed based on microstructure analysis. With the increase of plastic deformation, the conductivity of the material decreases due to micro-defects. While, with the increase of plastic deformation, the magnetic polarization of the material increases due to phase transformation of nonmagnetic austenitic phase to magnetic martensitic phase. Similar as the reason of plastic deformation, the fatigue damage also decreases the conductivity of the material and increases the magnetic polarization of the material. © 2018, Electrical Technology Press Co. Ltd. All right reserved.

Keyword :

304 austenitic stainless steels Austenitic phase Electromagnetic properties Long term process Magnetic polarizations Martensitic phase Microstructure analysis Testing machine

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GB/T 7714 Xie, Shejuan , Wu, Lei , Tong, Zongfei et al. Investigation of Electromagnetic Properties of 304 Austenitic Stainless Steel with Plastic Deformation and Fatigue Damage and Microstructure Analysis [J]. | Diangong Jishu Xuebao/Transactions of China Electrotechnical Society , 2018 , 33 (14) : 3170-3176 .
MLA Xie, Shejuan et al. "Investigation of Electromagnetic Properties of 304 Austenitic Stainless Steel with Plastic Deformation and Fatigue Damage and Microstructure Analysis" . | Diangong Jishu Xuebao/Transactions of China Electrotechnical Society 33 . 14 (2018) : 3170-3176 .
APA Xie, Shejuan , Wu, Lei , Tong, Zongfei , Yang, Qingning , Chen, Zhenmao , Zhu, Guangyi et al. Investigation of Electromagnetic Properties of 304 Austenitic Stainless Steel with Plastic Deformation and Fatigue Damage and Microstructure Analysis . | Diangong Jishu Xuebao/Transactions of China Electrotechnical Society , 2018 , 33 (14) , 3170-3176 .
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Improvement of Measuring Accuracy for Coating Covered on Conical Steel Shells by Correction of Eddy Current Signals SCIE
期刊论文 | 2018 , 46 (1) , 17-23 | JOURNAL OF TESTING AND EVALUATION
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Abstract :

In the petroleum industry and other fields, the thickness of the layer coated on the inner surface of containers is an important indicator to ensure the containers work in a safe or normal state. To acquire an accurate measurement, some appropriate corrections are necessary, especially for the eddy current sensor scanning over an irregular surface. The sensor's inclining or deviating state might cause much lift-off signal to be mixed in the testing signals, which would lead to an inaccurate result. To solve this problem, this paper analyzed the influencing factors of measuring accuracy for the coating on the conical steel shells. An effective correction method was proposed based on the characteristic of testing signals. Its effectiveness for enhancing the measuring accuracy was confirmed by simulation results.

Keyword :

coating eddy current testing numerical simulation signal correction thickness measurement

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GB/T 7714 Wu, Meixian , Zhang, Dongli , Chen, Zhenmao et al. Improvement of Measuring Accuracy for Coating Covered on Conical Steel Shells by Correction of Eddy Current Signals [J]. | JOURNAL OF TESTING AND EVALUATION , 2018 , 46 (1) : 17-23 .
MLA Wu, Meixian et al. "Improvement of Measuring Accuracy for Coating Covered on Conical Steel Shells by Correction of Eddy Current Signals" . | JOURNAL OF TESTING AND EVALUATION 46 . 1 (2018) : 17-23 .
APA Wu, Meixian , Zhang, Dongli , Chen, Zhenmao , Li, Yong . Improvement of Measuring Accuracy for Coating Covered on Conical Steel Shells by Correction of Eddy Current Signals . | JOURNAL OF TESTING AND EVALUATION , 2018 , 46 (1) , 17-23 .
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NDT of Cavity Defect in Metallic Plate Using dc Potential Drop Method SCIE
期刊论文 | 2018 , 46 (2) , 641-646 | JOURNAL OF TESTING AND EVALUATION
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Abstract :

A zoning testing method is proposed for the nondestructive testing of cavity defects in metallic foam plates based on the principle of dc potential drop testing. The dc is injected from the two ending points of the diagonal line while the inspection signal is measured from the nodal potential of nodes at the midline of the target region. The proposed method is numerically validated in terms of its signal sensitivity to the size and the location of the defect as well as its signal interference-resistant capability to defects located in the surrounding regions. Furthermore, experimental validation is conducted, and the result shows that the proposed zoning testing method is suitable for the detection of cavity defects in practical cases.

Keyword :

dc potential drop metallic foam nondestructive testing zoning test

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GB/T 7714 Wang, Xiaojuan , Cai, Wenlu , Chen, Zhenmao . NDT of Cavity Defect in Metallic Plate Using dc Potential Drop Method [J]. | JOURNAL OF TESTING AND EVALUATION , 2018 , 46 (2) : 641-646 .
MLA Wang, Xiaojuan et al. "NDT of Cavity Defect in Metallic Plate Using dc Potential Drop Method" . | JOURNAL OF TESTING AND EVALUATION 46 . 2 (2018) : 641-646 .
APA Wang, Xiaojuan , Cai, Wenlu , Chen, Zhenmao . NDT of Cavity Defect in Metallic Plate Using dc Potential Drop Method . | JOURNAL OF TESTING AND EVALUATION , 2018 , 46 (2) , 641-646 .
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