Physics – Condensed Matter – Materials Science
Scientific paper
2004-12-17
Physics
Condensed Matter
Materials Science
29 pages, 1 table and 18 figures
Scientific paper
In this paper it is presented a detailed numerical investigation of acoustic emission signals obtained from test samples of fibreglass reinforced polymeric matrix composites, when subjected to tensile and flexural tests. Various fractal indices, characteristic of the signals emitted at the different structural failures of the test samples and which satisfy non-stationary distributions, have been determined. From the results obtained for these indices, related to the Hurst analysis, detrended fluctuation analysis, minimal cover analysis and to the boxcounting dimension analysis, it has been shown they can discriminate the different failure mechanisms and, therefore, they constitute their signature.
Fereira D. B. B.
Goncalves L. L.
Rebello J. M. A.
Silva F. E.
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