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Cheol-Woong Kim(김철웅),Tae-Young Kim,Cheon-Woong Park(박천웅),Un-Shop Shim(심은섭) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.11
The CFRP laminate is easy to delaminate by a relatively small impact, resulting in a reduction of the compression strength. Conventional monitoring methods, such as ultrasonic wave inspection and X-ray inspection, are very costly and time-consuming, with a difficulty of real-time monitoring. The Eddy Current (EC) technique has been used in nondestructive testing for metallic materials. Since CFRP laminate consists of electroconductive carbon fibers and insulative resin, it is inhomogeneous material with strongly anisotropic electrical property. EC path, however, may be complicated in the laminate because of the strong anisotropy. Since a delamination is debonding of in-plane interfaces of plies, eddy current in the through-thickness direction plays an important role to measure electric resistance change. In Electric Resistance Change Method (ERCM), delamination location and length are estimated by measuring electric resistance chang on laminate.