116 FGセンサを用いた磁性構造材料の欠陥形状の非破壊評価(OS7-(4) 材料損傷の機構・実験評価,オーガナイズドセッション)

概要

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Non-destructive evaluation of defect shape for ferromagnetic structural material SS400 was performed by magnetic flux leakage technique using a fluxgate sensor. Changes in leakage magnetic flux density were measured by varying the defect depth. With increasing the defect depth the leakage magnetic flux density also increased and it was found that the defect depth could be estimated by measuring the relationship between the leakage magnetic flux density and the defect depth previously. In order to estimate defects which have more complicated shapes, inverse analyses were also performed. The relationship between the magnetic flux density and magnetic moment of the defect was formulated. By using the singular value decomposition technique distribution of the magnetic moment of the defect was calculated from the simulated magnetic flux density which contained 5% noises at most and it was found that the defect shape and size were successfully obtained.
一般社団法人日本機械学会の論文
2009-08-25