Spectrum Analysis of Acoustic Emissions from Boron-Aluminum Composites
- 1 January 1975
- book chapter
- Published by ASTM International
- p. 202-214
- https://doi.org/10.1520/stp32309s
Abstract
Acoustic emissions were monitored from unidirectional tension specimens of boron-aluminum composites. It is shown that a sudden increase in count rate presages final failure. This sudden increase, however, occurs at a variable point relative to final failure load. Spectrum analysis in the range to 1 to 100 kHz was performed on the emissions with the result that no immediately obvious recognition pattern exists to distinguish between types of failure mechanisms. Thus, it is suggested that either acoustic emissions cannot be used to distinguish different failure modes in boron-aluminum composites in the frequency range studied or else the specimens used here had only one failure mode operating with sufficient energy release to be detected. The spectrum analysis did show, however, that the acoustic emissions had frequency components much higher than the frequencies for the fundamental modes of natural vibration of the specimen.This publication has 4 references indexed in Scilit:
- Evaluation of Composite Failures through Fracture Signal AnalysisJournal of Testing and Evaluation, 1973
- Experimental observations of tensile fracture in unidirectional boron filament reinforced aluminum sheetMetallurgical Transactions, 1973
- Characteristics of Acoustic Emission Signals Generated by a Phase TransitionPublished by Institute of Electrical and Electronics Engineers (IEEE) ,1972
- Analysis of Composite Failure Mechanisms Using Acoustic EmissionsJournal of Composite Materials, 1971