Propagation characteristics of electromagnetic field penetrated into laminated CFRPs using eddy current testing with pancake coil

Xu, Xiaojuan; Dai, Tao; Luo, Jin; Yan, Yuyue; Qiu, Jinhao

doi:10.1016/j.compstruct.2022.116378

Cited by 1 publication

(1 citation statement)

References 41 publications

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“…For unidirectional CFRP laminates, since the longitudinal conductivity is much larger than the transverse conductivity, [ 22 ] the induced EC field inside the CFRPs will stretch along the fiber direction, making the CFRPs strongly anisotropic. When the probe is placed along the fiber.…”

Section: Methodsmentioning

confidence: 99%

A novel method based on eddy‐current equilibrium for improving the sensitivity of fiber orientation detection

Wang

2023

Polymer Composites

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Fiber orientation deviation is a typical defect type in carbon fiber reinforced polymer composites (CFRPs) manufacturing process. Unlike other defect types, fiber orientation deviation has minimal influence on the local conductivity of CFRPs, so it is difficult to be detected by eddy current (EC) detection methods. Based on the principle of eddy‐current equilibrium, a new method is proposed in this paper to improve the sensitivity of fiber orientation detection. In this method, an EC field with eddy‐current equilibrium distribution inside the specimen is excited by means of a special double D‐shaped probe. When there is a deviation from the fiber orientation, the eddy‐current equilibrium state is broken, resulting in a rapid increase in the intensity and distribution range of the induced EC inside the specimen, and finally lead to a drastic change in the probe signal. The experimental results show that the double D‐shaped probe with an eddy‐current equilibrium effect can detect the fiber orientation of CFRPs, and the changes in fiber orientation can cause up to a 423.1% variation in the probe signal. Compared with the traditional rectangular probe, the designed probe is more sensitive than the former to small changes in fiber orientation in the range of −20° to 20° under high frequency excitation above 3 MHz. In addition, the proposed method can also be used for rapidly identifying fiber waviness with a deviation angle of 7.4° inside unidirectional CFRPs, which can be achieved effectively and intuitively through defect imaging.

show abstract

Section: Methodsmentioning

confidence: 99%

A novel method based on eddy‐current equilibrium for improving the sensitivity of fiber orientation detection

Wang

2023

Polymer Composites

View full text Add to dashboard Cite

show abstract

Propagation characteristics of electromagnetic field penetrated into laminated CFRPs using eddy current testing with pancake coil

Cited by 1 publication

References 41 publications

A novel method based on eddy‐current equilibrium for improving the sensitivity of fiber orientation detection

A novel method based on eddy‐current equilibrium for improving the sensitivity of fiber orientation detection

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