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< Page ,Total 22 >
Influence of tensile stress on hysteresis loop of Reduced Activation Ferrite & Martensitic steel EI
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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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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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 :

nondestructive testing metallic foam zoning test dc potential drop

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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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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 :

numerical simulation thickness measurement coating eddy current testing signal correction

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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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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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An FEM-BEM method for halo current problem and its application to HL-2M Tokamak EI Scopus CPCI-S SCIE
期刊论文 | 2018 , 136 , 667-673 | Fusion Engineering and Design
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Abstract :

Halo current in Tokamak device during plasma vertical displacement events (VDEs) may damage the in-vessel components due to huge electromagnetic (EM) force. It is important to simulate the distribution of halo current in order to evaluate the EM force and the corresponding structural dynamic response. In this paper, an FEM-BEM method was proposed at first to simulate the current distribution in conductors excited by a sinusoidal conducting current injection. The response under a transient excitation was then realized by using the strategy of the frequency domain summation (FDS). A numerical simulation code was developed based on the proposed numerical scheme. The validity of the numerical method and corresponding code were proved by comparing numerical results of the developed code with those of the ANSYS software using step by step time domain integration. Finally, the proposed method was applied to the simulation of the halo current in a simplified vacuum vessel model of the HL-2M Tokamak. The simulation results provide good reference for the subsequent analysis of mechanical behaviors of in-vessel structures. © 2018 Elsevier B.V.

Keyword :

Current distribution Electromagnetic forces FEM-BEM method Frequency domains Halo currents HL-2M tokamaks In-vessel components Vertical displacement events

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GB/T 7714 Li, Xudong , Xie, Shejuan , Yuan, Hongwei et al. An FEM-BEM method for halo current problem and its application to HL-2M Tokamak [J]. | Fusion Engineering and Design , 2018 , 136 : 667-673 .
MLA Li, Xudong et al. "An FEM-BEM method for halo current problem and its application to HL-2M Tokamak" . | Fusion Engineering and Design 136 (2018) : 667-673 .
APA Li, Xudong , Xie, Shejuan , Yuan, Hongwei , Pei, Cuixiang , Chen, Zhenmao . An FEM-BEM method for halo current problem and its application to HL-2M Tokamak . | Fusion Engineering and Design , 2018 , 136 , 667-673 .
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Quantitative Inversion of Stress and Crack in Ferromagnetic Materials Based on Metal Magnetic Memory Method EI SCIE Scopus
期刊论文 | 2018 , 54 (10) | IEEE TRANSACTIONS ON MAGNETICS
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Ferromagnetic materials are widely used in engineering structures. Damages caused during manufacture and the use of ferromagnetic materials may seriously undermine the safety of the engineering structure, and even lead to serious industrial accidents. For the early damage testing problem of ferromagnetic materials, it is imperative to propose and adopt new nondestructive testing methods. The metal magnetic memory (MMM) method, which is also known as the micromagnetic testing method, can achieve the early detection of damages in ferromagnetic materials such as steels. However, due to the lack of the quantitative research, the MMM method is only applicable for damage localization. In this paper, the MMM method is utilized to quantitatively evaluate the stress and crack in ferromagnetic materials. The inverse model including the objective function and optimization parameters is proposed. The reconstruction approach is established based on the conjugate gradient inversion method and the exact line search algorithm. In the theoretical analysis, the effectiveness of the MMM method in quantitative determination regarding the position and size of defects is verified with the experimental signal of a hole defect. Following this, the theoretical analyses of localization and sizing of stress and crack are conducted by using the simulation results as the measured signals. It can be found from the results that the MMM method can he applicable for quantitative evaluation of surface rectangular cracks, surface stress concentration zone, convex-type defect, and so on. In addition, the influences of the signal selection, sampling rate, lift-off value, stress level, and noise amplitude on the quantitative analysis of early stress concentration are discussed in details.

Keyword :

metal magnetic memory (MMM) magnetic memory signals Ferromagnetic materials inverse problem stress and crack

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GB/T 7714 Shi, Pengpeng , Jin, Ke , Zhang, Pengcheng et al. Quantitative Inversion of Stress and Crack in Ferromagnetic Materials Based on Metal Magnetic Memory Method [J]. | IEEE TRANSACTIONS ON MAGNETICS , 2018 , 54 (10) .
MLA Shi, Pengpeng et al. "Quantitative Inversion of Stress and Crack in Ferromagnetic Materials Based on Metal Magnetic Memory Method" . | IEEE TRANSACTIONS ON MAGNETICS 54 . 10 (2018) .
APA Shi, Pengpeng , Jin, Ke , Zhang, Pengcheng , Xie, Shejuan , Chen, Zhenmao , Zheng, Xiaojing . Quantitative Inversion of Stress and Crack in Ferromagnetic Materials Based on Metal Magnetic Memory Method . | IEEE TRANSACTIONS ON MAGNETICS , 2018 , 54 (10) .
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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: 1
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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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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
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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 :

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

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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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A study on influence of magnetic field on fracture properties of China low activation martensitic steel EI Scopus CPCI-S SCIE
期刊论文 | 2018 , 136 , 706-711 | Fusion Engineering and Design
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The influence of strong magnetic field on fracture properties of the China Low Activation Martensitic (CLAM) steel was quantitatively evaluated in this paper by using experimental method. In view of the strong confining magnetic field in Tokamak fusion reactors, fracture experiments of the CLAM steel were conducted in strong magnetic fields up to 5 T. A superconducting magnet was applied to supply a magnetic field strong enough to fulfill the experimental requirements and compact tension (CT) specimens made of the CLAM steel were applied in the tensile fracture testing. An experimental system including a mechanical stretch unit, a signal acquisition unit (for both displacement and force) and a controlling unit was designed and constructed. The critical fracture force of each CT specimen was determined from the measured force-crack opening displacement (P-V) curve. Experimental results show that the critical fracture force decreases significantly with the increment of external magnetic field, which reveals that the magnetic field significantly promotes the propagation of the cracks in the CLAM steel. It can be concluded from the experimental results that the influence of magnetic field has to be taken into account in order to properly evaluate the fracture behaviors of the CLAM steel to apply it in a Tokamak fusion reactor. © 2018 Elsevier B.V.

Keyword :

China low activation martensitic steels Confining magnetic-field Crack opening displacements Experimental requirements Fracture force Influence of magnetic field Rafm steels Strong magnetic fields

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GB/T 7714 Xie, Zheng , Li, Qun , Pei, Cuixiang et al. A study on influence of magnetic field on fracture properties of China low activation martensitic steel [J]. | Fusion Engineering and Design , 2018 , 136 : 706-711 .
MLA Xie, Zheng et al. "A study on influence of magnetic field on fracture properties of China low activation martensitic steel" . | Fusion Engineering and Design 136 (2018) : 706-711 .
APA Xie, Zheng , Li, Qun , Pei, Cuixiang , Chen, Zhenmao . A study on influence of magnetic field on fracture properties of China low activation martensitic steel . | Fusion Engineering and Design , 2018 , 136 , 706-711 .
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