210 フラックスゲートセンサを用いた磁性構造材料の非破壊損傷評価(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)
詳細
Non-destructive evaluation tests of defects for SS400 were performed by magnetic flux leakage technique using a fluxgate sensor. Changes in magnetic flux leakage due to the defects could be measured at 5 mm lift off height for the defect of 0.3mm width, and could be measured even at 7 mm lift off height for the defect of 3.0mm width. The sizes of defects were consistent with the peak to peak value of magnetic flux leakage ΔBz. In-situ magnetic flux measurements for permalloy under stress loading were also performed, and the magnetic flux measured by the fluxgate sensor increased with increasing stress.
