212 渦流探傷法によるCFRP積層板はく離検出のためのプローブ開発(OS6-2 非破壊評価と構造モニタリング,OS6 非破壊評価と構造モニタリング)

概要

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Carbon fiber reinforced plastic (CFRP) laminates are now widely used in various fields. They are, however, very sensitive to an impact which causes delaminations in the laminate. Since delamination reduces the mechanical property of the laminate, nondestructive inspection is required to maintain the structural reliability of the CFRP structure. Eddy current method (ECT) has been studied to be applied to CFRP laminate. Strong electric anisotropy, however, makes application of the method difficult. Since delamination is in-plane damage in the laminate, conventional ECT has a problem for making current-loop which should be impeded by the damage to be detected. In the present paper, a new probe for electrically anisotropic CFRP laminate is introduced to resolve the problems. The probe is made of two coils put side-by-side to induce strong uniform electric current. Delamination was made in the CFRP laminate by means of the indentation test; the applicability of the ECT with new probe is examined experimentally.
一般社団法人日本機械学会の論文
2007-10-24