Research on magnetic leakage detection technology for crimping defects of carbon fiber composite core based on magnetic thin film coating
Under dual-carbon background,carbon fiber composite core wire has the characteristics of environmental protection and energy saving,and has a good application prospect,but its core rod is brittle and not resistant to bending.There is no effective method for the quality inspection of the crimped part of the steel anchor,which seri-ously restricts the popularization of this technology in power transmission and distribution projects.In this paper,carbon fiber composite wire with a cross-sectional area of 40 mm2 and tension section crimping fittings are used as research objects,and a scheme for crimping defects detection of carbon fiber core rod based on magnetic leakage method is proposed.Firstly,the magnetic leakage field analysis model of the compacting fitting after magnetic film coating is constructed.The influences of magnetic pole distance L,radial air gap λ,probe shoe depth h and width d on the SNR under two defect conditions of fracture and low pressure are investigated.It is concluded that the SNR effect is better when L=55 mm,λ=3.5 mm,h=7 mm and d=12 mm.On this basis,by increasing the fracture size and the degree of low pressure,it is concluded that the axial component of the fracture leakage magnetic field shows a single peak value,the radial component shows a double peak value,and the axial and radial components of the low pressure are opposite.Finally,the feasibility of the proposed scheme is verified by the experimental results.The results show that the magnetic film has the ability to reflect the defect state of carbon fiber core.It is found that the morphological characteristics of the defect signal are inverted"V" shape,which is consistent with the theoreti-cal analysis.The research results can provide a new idea for the crimping quality inspection of steel anchors with carbon fiber composite mandrel.
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