On the characterization of continuous fibres fracture by quantifying acoustic emission and acousto-ultrasonics waveforms
✍ Scribed by Y.Z Pappas; A Kontsos; T.H Loutas; V Kostopoulos
- Publisher
- Elsevier Science
- Year
- 2004
- Tongue
- English
- Weight
- 600 KB
- Volume
- 37
- Category
- Article
- ISSN
- 0963-8695
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✦ Synopsis
The aim of the present work is the classification of the characteristics of elastic waves, which are generated by fibre failures during quasistatic tensile fibre bundle tests and captured by the use of acoustic emission (AE) method. In addition, elastic waves generated out of the fibre bundle gauge length and propagated through the bundle at different stages of the loading process using an acousto-ultrasonic (AU) technique are also classified. To this target, a large number of tests were conducted on organic, ceramic and carbon fibre bundles according to DIN 53942. An in-house developed analysis and quantification methodology of the captured AE and AU waveforms is proposed in order to identify the frequency content of the fibre failure event, to characterize the medium of propagation and to investigate the effect of the acquisition system on the monitored signals. In fact, the application of the proposed analysis on the results of the conducted mechanical tests leads to the development of a useful database, concerning the ranges of AE features and the representative sets of frequency values that correspond to fibre fracture. Furthermore, the proposed database offers valuable knowledge for the role of material parameters, such as fibre structure and properties, on the characteristics of the recorded waveforms, constituting in this way a valuable tool that enables a better understanding of elastic waves initiation and propagation through continuous fibres.