Nondestructive Detection of Flaw in Carbon-Fiber-Reinforced Plastics Using High-T_c Superconducting Quantum Interference Device

概要

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The nondestructive detection of small cracks and deep-lying flaws in structures is important for safety inspection. Carbon-fiber-reinforced plastics(CFRP)are complex materials for use in aircrafts and structures. We investigated the possibility of detecting flaws in CFRP using a nondestructive evaluation system using high-T_c superconducting quantum interference device(SQUID). A SQUID system for the nondestructive evaluation was developed using a SQUID magnetometer and a SQUID gradiometer fabricated based on a YBa_2Cu_3O_7-δ thin film. Holes, the diameters of which were equal to or larger than 0.4 mm, were made in CFRP plates and all holes except the smallest one were detected by a current-injection method using this system. The results show that the location and the diameter of the holes can be estimated from the distribution of the magnetic flux density, B_z, measured by the magnetometer or the distribution of the first-order gradient of B_z, dB_z/dx, measured by the gradiometer. The effect of texture of the carbon fiber in CFRP on the magnetic signal strength was discussed.
社団法人応用物理学会の論文
2000-03-15