Open Access. Powered by Scholars. Published by Universities.®

Physics Commons

Open Access. Powered by Scholars. Published by Universities.®

Electromagnetics and Photonics

Barkhausen effects

1996

Articles 1 - 1 of 1

Full-Text Articles in Physics

Effects Of Surface Condition On Barkhausen Emissions From Steel, Anthony P. Parakka, David C. Jiles, H. Gupta, S. Jalics Apr 1996

Effects Of Surface Condition On Barkhausen Emissions From Steel, Anthony P. Parakka, David C. Jiles, H. Gupta, S. Jalics

Center for Nondestructive Evaluation Publications

Temperature changes during mechanical processing such as grinding of steel parts can cause phase changes in the microstructure. Thermal shock during the process can give rise to localized surface residual stress. The net result can be reduced wear resistance and fatigue life leading to early failure during service. Effective methods for the detection of such damage are necessary. Barkhausen emissions, which arise from discontinuous motion of domain walls, are sensitive to microstructual changes that affect domain dynamics. Detected Barkhausen signals are predominantly from a surface layer about 200 μm thick, those from deeper being attenuated due to eddy currents. An ...