Parameterization of asymmetry in magnetoacoustic emission by numerical processesTwo methods for processing the digitized waveform data obtained from magnetoacoustic emission measurements on a high-strength steel are investigated. Two different techniques to obtain an asymmetry parameter are presented. It is shown that the variation in this asymmetry parameter from five embrittled samples and one unembrittled steel sample can be related to the impact toughness and is not dependent on the magnetic field strength. This technique is nondestructive and is shown to determine the normalized impact toughness of a high-strength steel to better than 14 percent in the decade of interest. A comparison of a magnetoacoustic emission burst and pickup coil output from an unembrittled steel sample and an embrittled sample is illustrated.
Document ID
19930035653
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Birt, E. A. (Analytical Services and Materials, Inc. Hampton, VA, United States)
Yost, W. T. (NASA Langley Research Center Hampton, VA, United States)
Denale, R. (U.S. Navy, David Taylor Research Center Annapolis, MD, United States)
Grainger, J. L. (Analytical Services and Materials, Inc. Hampton, VA, United States)
Date Acquired
August 15, 2013
Publication Date
January 1, 1992
Publication Information
Publication: In: Review of progress in quantitative nondestructive evaluation. Vol. 11B; Proceedings of the 18th Annual Review, Brunswick, ME, July 28-Aug. 2, 1991 (A93-19582 06-38)