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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
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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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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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材料损伤电磁无损检测与评估新技术研究
期刊论文 | 2018 , (2) , 1-4,15 | 中国特种设备安全
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Abstract :

工业设备广泛应用于石油、化工、电力等行业,同国民经济发展和人民日常生活密切相关.当前工业设备向着极端化、轻量化方向发展,使得设备结构形式和损伤模式多样化;另外数量众多的工业设备在役安全评定缺少全面的检测数据支撑.电磁无损检测具有快速、非接触的优势.针对不同材料和损伤模式的电磁无损检测技术与方法呈现多样化,在检测机理、仪器和工艺上存在较大区别.在中国特种设备检测研究院牵头下,20家产学用单位共同申报“十三五”国家重点研发计划“国家质量基础的共性技术研究与应用(NQI)”专项项目“材料损伤电磁无损检测与评估关键技术研究及仪器研制”并获得立项.本文主要介绍项目的背景、目标及总体研究方案、预期主要研究成果等相关内容.

Keyword :

脉冲涡流检测 红外检测 电磁检测 太赫兹检测 微磁检测

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GB/T 7714 陈金忠 , 沈功田 , 郑阳 et al. 材料损伤电磁无损检测与评估新技术研究 [J]. | 中国特种设备安全 , 2018 , (2) : 1-4,15 .
MLA 陈金忠 et al. "材料损伤电磁无损检测与评估新技术研究" . | 中国特种设备安全 2 (2018) : 1-4,15 .
APA 陈金忠 , 沈功田 , 郑阳 , 俞跃 , 武新军 , 陈振茂 . 材料损伤电磁无损检测与评估新技术研究 . | 中国特种设备安全 , 2018 , (2) , 1-4,15 .
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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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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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A simulation method to evaluate electrical conductivity of closed-cell aluminum foam EI Scopus SCIE
期刊论文 | 2018 , 58 (3) , 289-307 | International Journal of Applied Electromagnetics and Mechanics
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Abstract :

© 2018 - IOS Press and the authors. All rights reserved. Aluminum foam is a functional material which is highly porous with cells of stochastic geometry. In distinction to polymer foam, aluminum foam is electrically conductive and has typical applications in many engineering areas. Optimal design and manufacture of foam structure usually require detailed understanding of the electrical property of the aluminum foam. In this study, a three-dimensional finite element numerical model based on the statistic characteristics of the geometrical structure of the closed-cell aluminum foam was proposed. The proposed numerical method was applied to study the property of the current conduction and to clarify the dependence of the electrical conductivity on the porosity as well as the cell size. A shape factor defined based on the numerical simulation results is introduced to the theoretical model of the electrical conductivity regarding porosity, which can describe the relationship between the electrical conductivity and the porosity of the closed-cell aluminum foam properly. It was found that the porosity has a negative effect on the electrical conductivity in a power law approximately, while the cell size has a slight effect on the electrical conductivity of the closed-cell aluminum foam. Finally, the simulation results were compared to the experimental ones and their good agreement demonstrated the feasibility and accuracy of the proposed numerical model of the closed-cell metallic foam.

Keyword :

Cell size Closed-cell aluminum foam Electrical conductivity Finite element model Porosity

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GB/T 7714 Xie, Shejuan , Xu, Panpan , Cai, Wenlu et al. A simulation method to evaluate electrical conductivity of closed-cell aluminum foam [J]. | International Journal of Applied Electromagnetics and Mechanics , 2018 , 58 (3) : 289-307 .
MLA Xie, Shejuan et al. "A simulation method to evaluate electrical conductivity of closed-cell aluminum foam" . | International Journal of Applied Electromagnetics and Mechanics 58 . 3 (2018) : 289-307 .
APA Xie, Shejuan , Xu, Panpan , Cai, Wenlu , Chen, Hong-En , Zhou, Haiqiang , Chen, Zhenmao et al. A simulation method to evaluate electrical conductivity of closed-cell aluminum foam . | International Journal of Applied Electromagnetics and Mechanics , 2018 , 58 (3) , 289-307 .
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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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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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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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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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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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