Flexible Floral Eddy Current Probe for Detecting Flaws in Metal Plate

She, Saibo; He, Yunze; Chen, Yifang; Chady, Tomasz

doi:10.1109/jsen.2020.2995472

Cited by 29 publications

(5 citation statements)

References 34 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Because circular coil is widely used to be an exciting coil, the exciting coil in Figure 3(a) is used for comparison. Then, for the EC distribution conditioning idea, the Koch curve is selected to design the exciting coil [19]. Because the Koch curve has two symmetrical axes, the loop between node C and node D in Figure 3(a) can be topologically transformed into two kinds of exciting coils in which the axis of the Koch curve overlaps the line between A and B, as shown in Figures 3(c) and 3(d).…”

Section: Probe Designmentioning

confidence: 99%

“…Daura et al [18] proposed using the wireless power transfer to efficiently acquire the defect signal of the transmitter-receiver flexible printed coil. She et al [19] proposed the flexible floral eddy current probe, which is a differential exciting eddy current probe to suppress the lift-off noise and to detect the flaws in the metal plate. Zhang et al [20] proposed a novel flexible array eddy current probe with a three-phase alternative current to excite the three exciting coils.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A Novel Planar Differential Koch Fractal Eddy Current Probe with Parallel Wound Topological Structure

2021

View full text Add to dashboard Cite

Flexible planar eddy current probes are widely used to detect conductive components with complex surface. In this study, topological transformation is applied to design a differential Koch coil exciting eddy current probe. Two kinds of Koch exciting coils, Koch A and Koch B , were obtained by topological transformation from a three-dimensional differential exciting eddy current probe. Finite element model simulation is conducted to visualize the differences of eddy current distributions induced by the probes and get the defect signal. A detailed comparison is made among the two kinds of Koch eddy current probes and a circular eddy current probe by experiments. The experiments demonstrate that the sensitivity of the Koch A eddy current probe is higher than that of another two probes for detecting the defect which is shorter than the size of the probe. This work provides a novel method for improving the performance of eddy current probes in the coil structure design.

show abstract

Section: Probe Designmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Novel Planar Differential Koch Fractal Eddy Current Probe with Parallel Wound Topological Structure

2021

View full text Add to dashboard Cite

show abstract

“…In addition to the above-mentioned probes for practical applications, many flexible or planar EC probes have been manufactured for fundamental research. She et al [13] proposed a flexible floral EC probe with a spiral coil structure for detecting flaws in a metal plate and adopted a differential coil structure to suppress the lift-off noise and background signal. Zhang et al [14] presented a three-phase excitation planar EC array probe whose array element was wound with a spiral coil.…”

Section: Introductionmentioning

confidence: 99%

Lift-Off Effect of Koch and Circular Differential Pickup Eddy Current Probes

Chen,

Cao,

Zhang

et al. 2024

Chin. J. Mech. Eng.

View full text Add to dashboard Cite

A flexible or planar eddy current probe with a differential structure can suppress the lift-off noise during the inspection of defects. However, the extent of the lift-off effect on differential probes, including different coil structures, varies. In this study, two planar eddy current probes with differential pickup structures and the same size, Koch and circular probes, were used to compare lift-off effects. The eddy current distributions of the probes perturbed by 0° and 90° cracks were obtained by finite element analysis. The analysis results show that the 90° crack can impede the eddy current induced by the Koch probe even further at relatively low lift-off distance. The peak-to-peak values of the signal output from the two probes were compared at different lift-off distances using finite element analysis and experimental methods. In addition, the effects of different frequencies on the lift-off were studied experimentally. The results show that the signal peak-to-peak value of the Koch probe for the inspection of cracks in 90° orientation is larger than that of the circular probe when the lift-off distance is smaller than 1.2 mm. In addition, the influence of the lift-off distance on the peak-to-peak signal value of the two probes was studied via normalization. This indicates that the influence becomes more evident with an increase in excitation frequency. This research discloses the lift-off effect of differential planar eddy current probes with different coil shapes and proves the detection merit of the Koch probe for 90° cracks at low lift-off distances.

show abstract

“…Metal plates are widely used in various fields of society, such as home appliances manufacturing field, automotive manufacturing field, aviation field and precision instrument production field [1][2][3][4]. There are many defects in the rolling process of metal plate due to various reasons, and the hole defects are one of the most common [5]. The existence of holes and cracks directly affects the strength of the metal plate and causes hidden dangers.…”

Section: Introductionmentioning

confidence: 99%

Simulation of crack growth for metal plates with holes based on cohesive zone model

Ma¹,

Song²,

Zhang³

et al. 2022

Mater. Res. Express

View full text Add to dashboard Cite

Hole defects are very common in metal plates. The propagation of cracks in engineering structural members will be affected by the holes of the members, which will not only change the propagation direction of cracks, but also have the ability to limit the growth of cracks. Therefore, the study of material fracture crack propagation caused by the distribution of holes and other factors under loading conditions has become a problem that needs to be considered in structural design. The cohesive zone model(CZM) can effectively avoid the singularity problem of crack tip stress when simulating crack growth, and at the same time can clearly show the crack growth path. Based on exponential cohesive zone model, the finite element analysis of tensile test for metallic materials with hole defects was carried out. The crack propagation law under constant load was obtained. It was proved that CZM could simulate the crack propagation in metallic materials with holes more accurately. The influence of the pore size, shape, distribution on the crack propagation is discussed. The results show that the smaller the distance difference between holes, the greater the supporting reaction force. The smaller the radius of the hole, the higher the fracture toughness and the maximum supporting reaction force of the metal plate. And it also can be seen that as the number of holes increases, the maximum supporting reaction force and fracture toughness of the metal plate decrease. The use of staggered holes distribution has greater supporting force and better toughness. The research results of this paper provide a theoretical basis and reference for investigating the propagation and propagation of cracks in the process of damage and failure of materials and for structural design and performance evaluation of engineering materials.

show abstract

Flexible Floral Eddy Current Probe for Detecting Flaws in Metal Plate

Cited by 29 publications

References 34 publications

A Novel Planar Differential Koch Fractal Eddy Current Probe with Parallel Wound Topological Structure

A Novel Planar Differential Koch Fractal Eddy Current Probe with Parallel Wound Topological Structure

Lift-Off Effect of Koch and Circular Differential Pickup Eddy Current Probes

Simulation of crack growth for metal plates with holes based on cohesive zone model

Contact Info

Product

Resources

About