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Title: Determination of arrival times for acoustic emission source location in composites

Abstract

The determination of the arrival time of an AE event has been studied using simulated acoustic emission (AE) signals on a Kevlar/epoxy composite. Transient recorder records were used to study the AE waveforms as well as the background electronic noise. Parameters studied include the bandpass and the relative position of the sensor with respect to the source position. The rise of the AE signal out of the background electronic noise was studied in detail by measuring the amplitude of each ''half-cycle'' of the analog signal both before the arrival of the AE event and for the first part of the AE signal. A relatively large amplitude difference was observed between the amplitude of the first half-cycle of the AE event and the peak amplitude of the AE event. Implications of the results obtained in these experiments are discussed relative to the commercial AE instrumentation approach of using penetration of the threshold to determine the arrival time of an AE event. In particular, it is shown that accurate source location in the composite depends on having a significantly large amplitude difference between the threshold and the peak amplitude for each channel in the AE source location array. Finally, an alternative approachmore » is examined for potential use to determine the arrival time of an AE event.« less

Authors:
Publication Date:
Research Org.:
Denver Univ., CO (USA). Dept. of Engineering
OSTI Identifier:
5566901
Report Number(s):
Y/Sub-86-19Y27448/1; CONF-860750-1
ON: DE86012964
DOE Contract Number:  
AC05-84OS21400
Resource Type:
Conference
Resource Relation:
Conference: 2. international symposium on acoustic emission from reinforced composites, Montreal, Canada, 24 Jul 1986; Other Information: Portions of this document are illegible in microfiche products
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; COMPOSITE MATERIALS; ACOUSTIC EMISSION TESTING; MATERIALS TESTING; STRESSES; WAVE FORMS; ACOUSTIC TESTING; MATERIALS; NONDESTRUCTIVE TESTING; TESTING; 420500* - Engineering- Materials Testing

Citation Formats

Hamstad, M A. Determination of arrival times for acoustic emission source location in composites. United States: N. p., 1986. Web.
Hamstad, M A. Determination of arrival times for acoustic emission source location in composites. United States.
Hamstad, M A. Wed . "Determination of arrival times for acoustic emission source location in composites". United States.
@article{osti_5566901,
title = {Determination of arrival times for acoustic emission source location in composites},
author = {Hamstad, M A},
abstractNote = {The determination of the arrival time of an AE event has been studied using simulated acoustic emission (AE) signals on a Kevlar/epoxy composite. Transient recorder records were used to study the AE waveforms as well as the background electronic noise. Parameters studied include the bandpass and the relative position of the sensor with respect to the source position. The rise of the AE signal out of the background electronic noise was studied in detail by measuring the amplitude of each ''half-cycle'' of the analog signal both before the arrival of the AE event and for the first part of the AE signal. A relatively large amplitude difference was observed between the amplitude of the first half-cycle of the AE event and the peak amplitude of the AE event. Implications of the results obtained in these experiments are discussed relative to the commercial AE instrumentation approach of using penetration of the threshold to determine the arrival time of an AE event. In particular, it is shown that accurate source location in the composite depends on having a significantly large amplitude difference between the threshold and the peak amplitude for each channel in the AE source location array. Finally, an alternative approach is examined for potential use to determine the arrival time of an AE event.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1986},
month = {3}
}

Conference:
Other availability
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