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笹田 星児*; Takahashi, Yoshihito*; Takeuchi, Keisuke*; 廣井 孝介; Su, Y. H.; 篠原 武尚; 渡辺 賢一*; 瓜谷 章*
Japanese Journal of Applied Physics, 61(4), p.046004_1 - 046004_8, 2022/03
被引用回数：0 パーセンタイル：0(Physics, Applied)Residual strains in a punched electrical steel sheet increase the iron loss in the steel sheet. To accurately estimate the effect of residual strain on iron loss, the residual strain distribution in a punched electrical steel sheet should be evaluated. In this study, we demonstrated the two- dimensional imaging of the residual strain distribution in a punched electrical steel sheet using the neutron Bragg-edge transmission imaging method. To improve the accuracy of strain measurement with minimal deterioration of spatial resolution, we applied a process of superposing many specimen images. The tensile strain near the punched edge and the compressive strain inside the core were experimentally confirmed using this method. Finally, the neutron Bragg-edge imaging results and those obtained from kernel average misorientation map using electron backscattered diffraction were compared to verify the validity of the proposed method.
笹田 星児*; 廣井 孝介; 小山内 健太*; 篠原 武尚; Watanabe, K.*; 瓜谷 章*
Japanese Journal of Applied Physics, 60(12), p.126003_1 - 126003_6, 2021/12
被引用回数：1 パーセンタイル：7.45(Physics, Applied)The evaluation of the magnetization distribution inside a bulk magnet is important for ensuring the performance of automotive motors because it strongly depends on the quality of magnetization inside the permanent magnet. In the conventional destructive method, it is difficult to accurately measure the magnetization with a high spatial resolution. The polarized neutron imaging technique can be used to visualize the distribution of the magnetic flux density inside a magnet nondestructively. In this study, we demonstrated the imaging of the magnetization distribution using polarized neutrons in an anisotropic ferrite magnet sample. The 2D distribution of the magnetization was experimentally obtained by polarized neutron imaging with a high spatial resolution of less than 1 mm. Furthermore, the validity of the results was confirmed by comparing them with those obtained using the conventional destructive method.
