磁気AEの発生機構に関する研究 : 第2報,集合組織の影響

概要

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In assuring the safety of a structure, it is important to evaluate the state of structural members non-destructively. Magneto-mechanical acoustic emission (MAE) is one of the non-destructive inspections. In the previous paper, we had studied MAE signals of a pure iron using displacement and shear sensors, for the detection of the longitudinal and shear components of the signals, which were analyzed with wavelet transform. From the analysis, the following things became clear: (1) the low frequency component (150 to 300 kHz) has strong displacement sensor response coincident with the rate of magnetic induction, suggesting magnetization via the discontinuous motion of domain walls. (2) the high frequency component (400 to 800 kHz) has strong shear sensor response and is observed near magnetic saturation, suggesting rotational magnetization effect. In this paper, the character of the detected MAE signals was discussed on the effect of the preferred orientation of the texture when the carbon steel specimens (0.23 wt% Carbon) deform plasticity. As the results, it was became clear that there is a close relation between the character and its preferred orientation.
社団法人日本機械学会の論文
2005-05-25