Overview of Researches on the Nondestructive Testing Method of Metal Magnetic Memory: Status and Challenges

Shi, Pengpeng; Su, Sanqing; Chen, Zhenmao

doi:10.1007/s10921-020-00688-z

Cited by 96 publications

(30 citation statements)

References 166 publications

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“…In this work, the conjugate gradient (CG) optimization algorithm is adopted to solve this optimization problem iteratively. The CG optimization method has been successfully applied to reconstruct surface cracks from ECT and DCPD signals [2][3][4] . In a similar way, the CG inverse strategy is updated for the reconstruction of the crack size and inner profile from LIT signals.…”

Section: Inverse Analysis Scheme For Crack Reconstructionmentioning

confidence: 99%

“…Among them, one of a promising approach is the inverse analysis, i.e., solving an inverse problem to get quantitative defect information from NDT signals. The inverse analysis using a modelbased optimization method or an artificial intelligence approach has been studied by many researchers for the reconstruction of the surface breaking cracks in different NDT fields, e.g., eddy current testing (ECT) and direct current potential drop (DCPD) method [1][2][3][4] . By using the inverse analysis, quantitative measurement of crack depth and shapes can be realized even for natural cracks such as stress corrosion cracks.…”

Section: Introductionmentioning

confidence: 99%

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Remote measurement and shape reconstruction of surface-breaking fatigue cracks by laser-line thermography

Qiu

Pei

Yang

et al. 2021

International Journal of Fatigue

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In this paper, a method for remote measurement and shape reconstruction of fatigue cracks by using laser-line thermography (LLT) technique is developed. A new feature parameter derived from the LLT signals is proposed to evaluate the length and estimate the general inner profile of a surface-breaking fatigue crack. An inversion analysis scheme based on conjugate gradient optimization algorithm is then applied to reconstruct the detailed inner profile and dimension of the crack. The reconstruction results with both numerically simulated LLT signals and experimental signals proved the feasibility of proposed inversion scheme and remote LLT method. Based on methods of this paper, not only the size of cracks can be quantitatively evaluated, but the inner profile is also reconstructed for cracks in different shapes from the LLT signals.

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Section: Inverse Analysis Scheme For Crack Reconstructionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Remote measurement and shape reconstruction of surface-breaking fatigue cracks by laser-line thermography

Qiu

Pei

Yang

et al. 2021

International Journal of Fatigue

Self Cite

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“…Many scholars have studied the relationship between pipe stress and magnetic signal, mostly using magnetic memory measurement (MMM) technology [ 11 , 12 ]. The magnetic memory method is used to detect materials in the geomagnetic environment without external excitation magnetic field [ 13 ]. The detected magnetic signal is the self-magnetic flux leakage (SFML) signal of the material [ 14 , 15 ].…”

Section: Introductionmentioning

confidence: 99%

Quantitative Study on MFL Signal of Pipeline Composite Defect Based on Improved Magnetic Charge Model

Liu

Luo

Gang

2021

Sensors

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Pipeline magnetic flux leakage (MFL) internal detection technology is the most widely used and effective method in the field of long-distance oil and gas pipeline online detection. With the improvement of data quantization precision, the influence of stress on MFL signal has been paid more and more attention. In this paper, the relationship between stress and saturation magnetization is introduced based on J-A theory. The analytical model of MFL detection signal for pipeline composite defects is established. The MFL signal characteristics of composite defects are quantitatively calculated. The effect of stress on MFL signal is studied. The theoretical analysis is verified by experimental data and excavation results. The researches show that the saturation magnetization of ferromagnets decreases exponentially with the increase of stress in strong magnetic field. The MFL signal of composite defect is weaker than that of volumetric defects of the same dimension. The axial amplitude and radial peak-to-peak value of MFL signal decrease with the increase of stress around the defect. The axial amplitude and radial peak-to-peak value of MFL signal increase non-linearly with the increase of width and depth of defects. When using MFL signal to judge the defect depth, it is necessary to make clear whether there is stress concentration phenomenon around the defect because the stress will lead to underestimation of the defect depth.

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“…The main purpose of the NDT 4.0 approach and development is to have real-time access to all the obtained results and the used parameters [11,12]. Many papers have been published on the development of the NDT industry, addressing its concepts in terms of the design, production, maintenance, lifespan, examinations, etc.…”

Section: Introductionmentioning

confidence: 99%

“…Many papers have been published on the development of the NDT industry, addressing its concepts in terms of the design, production, maintenance, lifespan, examinations, etc. [11][12][13][14][15]. In this manuscript, we adopt an approach to the NDT 4.0 concept that involves optimizing inspection parameters and eliminating the human factor.…”

Section: Introductionmentioning

confidence: 99%

Magnetic Particle Inspection Optimization Solution within the Frame of NDT 4.0

2021

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The quality of product and process is one of the most important factors in achieving constructively and then functionally safe products in any industry. Over the years, the concept of Industry 4.0 has emerged in all the quality processes, such as nondestructive testing (NDT). The most widely used quality control methods in the industries of mechanical engineering, aerospace, and civil engineering are nondestructive methods, which are based on inspection by detecting indications, without affecting the surface quality of the examined parts. Over time, the focus has been on research with the fourth generation in nondestructive testing, i.e., NDT 4.0 or Smart NDT, as a main topic to ensure the efficiency and effectiveness of the methods for a safe detection of all types of discontinuities. This area of research aims at the efficiency of methods, the elimination of human errors, digitalization, and optimization from a constructive point of view. In this paper, we presented a magnetic particles inspection method and the possible future directions for the development of standard equipment used in the context of this method in accordance with the applicable physical principles and constraints of the method for cylindrical parts. A possible development direction was presented in order to streamline the mass production of parts made of ferromagnetic materials. We described the methods of analysis and the tools used for the development of a magnetic particle inspection method used for cylindrical parts in all types of industry and NDT 4.0; the aim is to provide new NDT 4.0 directions in optimizing the series production for cylindrical parts from industry, as given in the conclusion of this article.

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Overview of Researches on the Nondestructive Testing Method of Metal Magnetic Memory: Status and Challenges

Cited by 96 publications

References 166 publications

Remote measurement and shape reconstruction of surface-breaking fatigue cracks by laser-line thermography

Remote measurement and shape reconstruction of surface-breaking fatigue cracks by laser-line thermography

Quantitative Study on MFL Signal of Pipeline Composite Defect Based on Improved Magnetic Charge Model

Magnetic Particle Inspection Optimization Solution within the Frame of NDT 4.0

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