Measurement of Magnetic Particle Amount and Evaluation Magnetic Flux Leakage Density for Quantitative Evaluation in Magnetic Particle Testing

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  • 磁粉探傷試験におけるき裂の定量的評価に向けた付着磁粉の動画像計測と漏洩磁束密度の評価
  • ジフンタンショウ シケン ニ オケル キレツ ノ テイリョウテキ ヒョウカ ニ ムケタ フチャクジフン ノ ドウガゾウ ケイソク ト ロウエイジソク ミツド ノ ヒョウカ

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Abstract

Because magnetic particle testing (MT) can detect microcracks by a simplified method, it is applied in non-destructive inspections of ferromagnetic materials in various industrial fields. Recently, establishing a technology that quantitatively evaluates crack shapes as well as detects cracks with high-precision has become an important topic in the non-destructive inspection. We consider developing such a quantitative evaluation technique that employs magnetic particle pattern of a crack in MT. In this research, the process of magnetic particle adherence to a crack was observed with a high-speed video camera and the change in the magnetic particle amount was evaluated at each instant. In addition, the technique for evaluating small magnetic flux leakage (MFL) density accurately was discussed with the measurement and the numerical analysis. From these results, the relationship between the MFL density and the magnetic particle amount was evaluated.

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