10.14489/td.2017.06.pp.034-041

2017, 06 June

DOI: 10.14489/td.2017.06.pp.034-041

Stepanova L. N., Chernova V. V.
ANALYSIS OF THE STRUCTURAL COEFFICIENTS OF ACOUSTIC EMISSION SIGNALS UNDER STATIC LOADING OF CFRP SPECIMENS WITH IMPACT DAMAGE
(pp. 42-41)

Abstract. The static testing of samples of T800 CFRP impact damage, which previously was applied to the center of the working area of the sample, is performed. The cargo of mass (m) was dropped from height (h). The impact energy was respectively 17, 25, 40 and 43 J. The effect of impact energy on the degradation properties of composite material (KM) was researched. The method of acoustic emission (AE) was carried out with the location of zones of delamination of the material samples, as in the region of shock damage and on its edges. It allowed to monitor the development of defects during the loading process from the moment of its inception up to the complete destruction of the samples. Structural ratios of AE signals were obtained using wavelet transforms. The dependences of changes of the structural coefficients from the static load and the dominant frequency at various values of impact energy were received. Analysis of time-and-frequency distribution of localized AE signals showed that at higher impact energy increased the rise time of their front. It allowed to analyze changes in the structure of AE signals and to associate it with the process of destruction of the material samples.

Keywords: carbon fiber reinforced plastic (CFRP), impact damage, lamination, acoustic emission, structural coefficient.

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L. N. Stepanova (Federal State Unitary Enterprise “Siberian Aeronautical Research Institute named after S. A. Chaplygin”, Novosibirsk, Russia) E-mail: Данный адрес e-mail защищен от спам-ботов, Вам необходимо включить Javascript для его просмотра.
V. V. Chernova (Siberian State University of Transport Communications (SGUPS), Novosibirsk, Russia) E-mail: Данный адрес e-mail защищен от спам-ботов, Вам необходимо включить Javascript для его просмотра.

+ - References Click to collapse

1. Stepanova L. N., Chernova V. V., Ramazanov I. S. (2015). A procedure for locating acoustic-emission signals during static testing of carbon composite samples. Defektoskopiia, (4), pp. 53-62. [in Russian language]
2. Stepanova L. N., Ramazanov I. S., Chernova V. V. (2015). Acoustic emission signals structure wavelet analysis while strength tests of carbon fiber samples. Kontrol'. Diagnostika, (7), pp. 54-62. doi: 10.14489/td.2015.07. pp.054-062 [in Russian language]
3. Smolentsev N. K. (2003). Basic foundation of a wavelet theory. Wavelets in the MathLab. Kemerovo. [in Russian language]
4. Stepanova L. N., Kovalenko N. A., Ognyanova E. S. et al. (2015). The application of finite elements method, strain measurement and acoustic emission for determination fracture mechanism of carbon fiber-reinforced plastic samples during strength tests. Kontrol'. Diagnostika, (4), pp. 29-36. doi: 10.14489/td.2015.04.pp.029-036 [in Russian language]

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