Nondestructive inspection of a fractured nickel bar by Barkhausen and magnetoacoustic emissions
Publication in refereed journal

香港中文大學研究人員

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摘要Barkhausen emission (BE) and magnetoacoustic emission (MAE) measurements have been made on a nickel bar before and after it is tom apart by a tensile stress. The BE and MAE profiles obtained are all single-peaked. The peaks obtained after fracture are found at the lower field regions of the profiles, and this suggests that the field required for the domain wall motion in the fractured bar has been lowered. In the BE measurement, the signals show an increase of 44% (away from fracture end) to 144% (at fracture end);on the contrary, the MAE signals show a reduction of 43% (away from fracture end) to 14% (at fracture end). As the nickel bar is fractured, we find that in the broken pieces, the grains have been elongated in the stressed direction, and there is an increase of defects such as dislocations, voids and microcracks, especially near the fracture end of the bar. BE which is sensitive to these factors, has therefore been intensified. On the other hand, the plastically elongated grains, which have a lower absolute magnetostriction, enhance the reduction of MAE activity. The results measured from the nickel bar will be compared with those obtained from a fractured mild steel bar, which has different magnetostriction and other magnetic properties. (C) 1996 American Institute of Physics.
著者Yu CC, Qin CD, Ng DHL
會議名稱40th Annual Conference on Magnetism and Magnetic Materials
會議開始日06.11.1995
會議完結日09.11.1995
會議地點PHILADELPHIA
期刊名稱Journal of Applied Physics
出版年份1996
月份4
日期15
卷號79
期次8
出版社AMER INST PHYSICS
頁次4750 - 4752
國際標準期刊號0021-8979
電子國際標準期刊號1089-7550
語言英式英語
Web of Science 學科類別Physics; Physics, Applied; PHYSICS, APPLIED

上次更新時間 2021-28-02 於 01:20