ACOUSTIC EMISSION SIGNAL ANALYSIS IN FLAT PLATES
ABSTRACT
An acoustic emission signal from a deformation or fracture mechanism is assumed to initiate as essentially a point source for detection frequencies in the range of a few megahertz or below. Approximate mathematical expressions for predicting the number of signal durations, were derived and studied for flat specimen geometries.
A ½-in thick A-212-B steel plate was used to determine whether experimental observations could be predicted from approximate relationship derived. Both artificial and real acoustic emission sources were tested under a variety of conditions. Observations of good experimental agreement may provide a basis for optimizing signal detection in flat geometries. A preliminary study of pulse shapes and pulse durations was also conducted in experimental attempts to determine source depth as well as range.
CONTENTS
List of figures
List of tables
Introduction
Summary
Signal duration
- Analysis
- Experiments
Signal pulse shape
Conclusions and recommendations
Acknowledgments
Distribution
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