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学者姓名:陈振茂

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< Page ,Total 22 >
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
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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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Inspection of Delamination Defect in First Wall Panel of Tokamak Device by Using Laser Infrared Thermography Technique EI SCIE CPCI-S Scopus
会议论文 | 2018 , 46 (7) , 2699-2707 | 27th IEEE Symposium on Fusion Engineering (SOFE)
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Abstract :

First wall panels (FWPs), which adjoin the inner wall of the blanket modules in the vacuum vessel (VV) of a Tokamak device, are in structures of multilayer bounded together with a solid welding technique in order to perform its heat exchange, VV protection, and neutron breeding functions. The quality of the welding joint between layers is the key factor for FWP integrity. In order to conduct online inspection of the delamination defect in the FWPs, a nondestructive testing (NDT) method capable to detect delamination defect without accessing into the VV is required. In this paper, the feasibility of the laser infrared thermography (LIRT) testing NDT method was investigated experimentally for this purpose. To clarify its detectability under practical VV environment, inspections of several inspection modes were conducted based on the practical structure of FWP and VV of the EAST Tokamak device, i.e., modes of different distances and angles of FWPs toward the LIRT transducers. In practice, an LIRT testing system was established and several double-layered plate specimens with different artificial delamination defects were inspected under the selected testing conditions. Through thermography signal reconstruction, an image processing algorithm was proposed and adopted to enhance the defect detectability. From the results of different inspection modes, it was found that the angle factor may worsen the inspection precision and reduce the detectability for delamination defects in case of big defect depth-to-width ratio, even though the LIRT method is still applicable for inspection of relative large defects in FWP. Finally, the detectability in different inspection modes was clarified, which proved the feasibility of LIRT for FWP online inspection.

Keyword :

Blankets first wall panel (FWP) image enhancement infrared thermography (IRT) online inspection Tokamak

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GB/T 7714 Liu, Haochen , Pei, Cuixiang , Qiu, Jinxing et al. Inspection of Delamination Defect in First Wall Panel of Tokamak Device by Using Laser Infrared Thermography Technique [C] . 2018 : 2699-2707 .
MLA Liu, Haochen et al. "Inspection of Delamination Defect in First Wall Panel of Tokamak Device by Using Laser Infrared Thermography Technique" . (2018) : 2699-2707 .
APA Liu, Haochen , Pei, Cuixiang , Qiu, Jinxing , Chen, Zhenmao . Inspection of Delamination Defect in First Wall Panel of Tokamak Device by Using Laser Infrared Thermography Technique . (2018) : 2699-2707 .
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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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Thermo-magneto-elastoplastic coupling model of metal magnetic memory testing method for ferromagnetic materials EI SCIE Scopus
期刊论文 | 2018 , 123 (14) | JOURNAL OF APPLIED PHYSICS
WoS CC Cited Count: 2 SCOPUS Cited Count: 2
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Abstract :

Metal magnetic memory (MMM) testing (also known as micro-magnetic testing) is a new nondestructive electromagnetic testing method that can diagnose ferromagnetic materials at an early stage by measuring the MMM signal directly on the material surface. Previous experiments have shown that many factors affect MMM signals, in particular, the temperature, the elastoplastic state, and the complex environmental magnetic field. However, the fact that there have been only a few studies of either how these factors affect the signals or the physical coupling mechanisms among them seriously limits the industrial applications of MMM testing. In this paper, a nonlinear constitutive relation for a ferromagnetic material considering the influences of temperature and elastoplastic state is established under a weak magnetic field and is used to establish a nonlinear thermo-magneto-elastoplastic coupling model of MMM testing. Comparing with experimental data verifies that the proposed theoretical model can accurately describe the theremo-magneto-elastoplastic coupling influence on MMM signals. The proposed theoretical model can predict the MMM signals in a complex environment and so is expected to provide a theoretical basis for improving the degree of quantification in MMM testing. Published by AIP Publishing.

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GB/T 7714 Shi, Pengpeng , Zhang, Pengcheng , Jin, Ke et al. Thermo-magneto-elastoplastic coupling model of metal magnetic memory testing method for ferromagnetic materials [J]. | JOURNAL OF APPLIED PHYSICS , 2018 , 123 (14) .
MLA Shi, Pengpeng et al. "Thermo-magneto-elastoplastic coupling model of metal magnetic memory testing method for ferromagnetic materials" . | JOURNAL OF APPLIED PHYSICS 123 . 14 (2018) .
APA Shi, Pengpeng , Zhang, Pengcheng , Jin, Ke , Chen, Zhenmao , Zheng, Xiaojing . Thermo-magneto-elastoplastic coupling model of metal magnetic memory testing method for ferromagnetic materials . | JOURNAL OF APPLIED PHYSICS , 2018 , 123 (14) .
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Research on Nondestructive Examination of Bracket Welds of ITER In-Vessel Coils (IVC) EI SCIE Scopus
期刊论文 | 2018 , 28 (4) | IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
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Abstract :

The ITER in-vessel coils are comprised of edge-localized mode (ELM) and vertical stabilization (VS) coils. There are 27 ELM coils and 2 VS coils. All the ELM and VS coils are supported by the clamped brackets bolted to the rails which are welded to the vacuum vessel wall. The in-vessel environment is severe, characterized by large transient electromagnetic fields, high radiation flux, and high temperature. Therefore, an appropriate nondestructive examination approach should be established and qualified. The difficulty in the development of the bracket weld nondestructive examination is the complex structure which brings space limit and various reflect echoes. Phased array ultrasonic test (PAUT) was studied and developed for nondestructive examination. In order to obtain the appropriate test parameters, CIVA simulation software was utilized to visualize the acoustic field distribution and coverage. The sensitivity of the PAUT method was also demonstrated by using machined defect provided by ITER Organization. Experiment results shows that all of reference defects can be detected with peak amplitude higher than 80% of FSH for both first leg and second leg.

Keyword :

PAUT sidewall welds CIVA NDE bracket IVCs comb welds

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GB/T 7714 Liu, Xiaochuan , Wu, Yu , Chen, Zhenmao et al. Research on Nondestructive Examination of Bracket Welds of ITER In-Vessel Coils (IVC) [J]. | IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY , 2018 , 28 (4) .
MLA Liu, Xiaochuan et al. "Research on Nondestructive Examination of Bracket Welds of ITER In-Vessel Coils (IVC)" . | IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY 28 . 4 (2018) .
APA Liu, Xiaochuan , Wu, Yu , Chen, Zhenmao , Jom, Cherdpong , Bai, Xiaobao , Chen, Hongen et al. Research on Nondestructive Examination of Bracket Welds of ITER In-Vessel Coils (IVC) . | IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY , 2018 , 28 (4) .
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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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Numerical Analysis of Fracture Behavior of HL-2M Vacuum Vessel Subjected to Electromagnetic Force During Plasma Disruption EI SCIE Scopus
期刊论文 | 2018 , 46 (5) , 1622-1627 | IEEE TRANSACTIONS ON PLASMA SCIENCE
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Abstract :

If an initial crack exists in the vacuum vessel (VV) of HL-2M Tokamak system, the flow of the eddy current induced by the plasma disruption (PD) would be disturbed, and the current density would increase at the crack tip. Therefore, serious stress concentration would happen at the crack tip and may lead to crack propagation. To confirm the structural integrity of HL-2M VV is assured against serious PD, the fracture behavior of the VV of HL-2M Tokamak system with an initial crack under PD is studied. A numerical model based on finite-element method and linear fracture mechanics is developed to calculate the stress near the crack due to electromagnetic force in the VV. Stress intensity factor at the crack tips of different cases is evaluated to analyze the trend of crack propagation.

Keyword :

Crack electromagnetic (EM) force fracture behavior stress intensity factor

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GB/T 7714 Pei, Cuixiang , Wang, Yongxiang , Wang, Kaiqiang et al. Numerical Analysis of Fracture Behavior of HL-2M Vacuum Vessel Subjected to Electromagnetic Force During Plasma Disruption [J]. | IEEE TRANSACTIONS ON PLASMA SCIENCE , 2018 , 46 (5) : 1622-1627 .
MLA Pei, Cuixiang et al. "Numerical Analysis of Fracture Behavior of HL-2M Vacuum Vessel Subjected to Electromagnetic Force During Plasma Disruption" . | IEEE TRANSACTIONS ON PLASMA SCIENCE 46 . 5 (2018) : 1622-1627 .
APA Pei, Cuixiang , Wang, Yongxiang , Wang, Kaiqiang , Chen, Zhenmao . Numerical Analysis of Fracture Behavior of HL-2M Vacuum Vessel Subjected to Electromagnetic Force During Plasma Disruption . | IEEE TRANSACTIONS ON PLASMA SCIENCE , 2018 , 46 (5) , 1622-1627 .
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A new method for plastic strain measurement with Rayleigh wave polarization EI SCIE PubMed Scopus
期刊论文 | 2018 , 88 , 168-173 | ULTRASONICS
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Abstract :

In this work, a new non-contact and coupling-free ultrasound method with measuring Rayleigh wave polarization (RWP) by electromagnetic acoustic transducers (EMATs) is applied for plastic strain measurement, which can provide a very promising alternative and reference-free ultrasonic testing technique with high spatial resolution. Two specially designed EMAT receivers are developed to measure the polarization of Rayleigh wave generated by an enhanced meander-line-coil EMAT. The change in RWP due to the plastic strain has been successfully measured. And the measurement results indicate that the plastic strain at the specimen surface can be evaluated with good accuracy by measuring the relative change in RWP with the proposed EMAT-based method.

Keyword :

Electromagnetic acoustic transducer Nondestructive testing Plastic strain Rayleigh wave polarization

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GB/T 7714 Pei, Cuixiang , Zhao, Siqi , Liu, Tianhao et al. A new method for plastic strain measurement with Rayleigh wave polarization [J]. | ULTRASONICS , 2018 , 88 : 168-173 .
MLA Pei, Cuixiang et al. "A new method for plastic strain measurement with Rayleigh wave polarization" . | ULTRASONICS 88 (2018) : 168-173 .
APA Pei, Cuixiang , Zhao, Siqi , Liu, Tianhao , Chen, Zhenmao . A new method for plastic strain measurement with Rayleigh wave polarization . | ULTRASONICS , 2018 , 88 , 168-173 .
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Influence of Plastic Deformation and Fatigue Damage on Electromagnetic Properties of 304 Austenitic Stainless Steel EI SCIE Scopus
期刊论文 | 2018 , 54 (8) | IEEE TRANSACTIONS ON MAGNETICS
SCOPUS Cited Count: 1
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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 paper, first, the correlation between the material electromagnetic properties and the plastic deformation is investigated for a 304 austenitic stainless steel, and the mechanism is discussed based on the microstructure analysis. It is indicated that the increasing of plastic deformation leads to the material conductivity decrease which is considered to relate to the micro-defects including slip and twins, while the increasing of plastic deformation leads to the material magnetic property increase that has a close relationship with the martensitic transformation. Moreover, the influence of fatigue damage on the material electromagnetic properties and the microstructure analysis (slips, twins, and martensitic transformation) are also confirmed. Finally, the combined effect of plastic deformation and fatigue damage is also investigated through experiment. Besides, the difference of microstructures of three kinds of damage specimens is observed and analyzed.

Keyword :

304 austenitic stainless steel conductivity fatigue damage magnetic permeability microstructure nondestructive evaluation plastic deformation

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GB/T 7714 Xie, Shejuan , Wu, Lei , Tong, Zongfei et al. Influence of Plastic Deformation and Fatigue Damage on Electromagnetic Properties of 304 Austenitic Stainless Steel [J]. | IEEE TRANSACTIONS ON MAGNETICS , 2018 , 54 (8) .
MLA Xie, Shejuan et al. "Influence of Plastic Deformation and Fatigue Damage on Electromagnetic Properties of 304 Austenitic Stainless Steel" . | IEEE TRANSACTIONS ON MAGNETICS 54 . 8 (2018) .
APA Xie, Shejuan , Wu, Lei , Tong, Zongfei , Chen, Hong-En , Chen, Zhenmao , Uchimoto, Tetsuya et al. Influence of Plastic Deformation and Fatigue Damage on Electromagnetic Properties of 304 Austenitic Stainless Steel . | IEEE TRANSACTIONS ON MAGNETICS , 2018 , 54 (8) .
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