| 2018 №04 (03) |
DOI of Article 10.15407/tdnk2018.04.04 |
2018 №04 (05) |
Technical Diagnostics and Non-Destructive Testing №4, 2018, pp. 36-40
Acoustic emission at composite material testing
S.A. Nedoseka1, A.Ya. Nedoseka1, M.A. Shevtsova2, A.N. Guryanov1, A.A. Vambol1
1E.O. Paton Electric Welding Institute of the NAS Ukraine, 11 Kazymyr Malevych Str., 03150, Kyiv, Ukraine. E-mail: office@paton.kiev.ua
2N.E.Zhukovski National Aerospace University «Kharkiv Aviation Institute», Chkalov str., 61070, Kharkiv. E-mail: khai@khai.edu
Abstract:
Composite materials, including those based on carbon filaments, ensuring a rather great reduction of the weight of the developed structure of any shape, alongside the required strength, and allowing realization of unique characteristics at their application, are becoming ever wider applied at creation of structures and require development of a reliable nondestructive method for evaluation of their state, in particular, in service. Possibility of application of AE method based on EMA type instrumentation to control composite material Udo UD CST 150/300 with ARALDITE binder 564 was assessed in this work. Verification of the location of AE source coordinates was performed on an unloaded plate and on samples under static loading. Possibility of separation of different loading stages by AE signals was checked. It is shown that the studied composite material is testable from the viewpoint of AE method, allows determination of AE source coordinates with sufficiently high accuracy at test sounding and emits AE waves during deformation and fracture. In the presence of concentrators it is possible to determine their location during sample loading, with sufficient degree of accuracy for practical purposes. During the conducted AE testing of samples for tensile testing, two groups of events separated in time were singled out. The first of them appears soon after the start of loading, and the second one – directly before fracture and during it. An abrupt two times increase of the continuous AE level was noted at recording of the pre-fracture state and the moment of fracture. A fundamental possibility of development of the composites control procedure with AE technology application and prediction of their state after additional studies with the purpose of precise determination of the criteria, characterizing fracture, is noted. 8 Ref., 1 Tabl., 7 Fig.
Keywords: acoustic emission, composite materials, loading stage, deformation, coordinate location, prefracture state, control
Received: 27.11.2018
Published: 11.12.2018
References
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