10.14489/td.2018.08.pp.014-020

2018, 09 сентябрь (September)

DOI: 10.14489/td.2018.08.pp.014-020

Bataev V. A., Stepanova L. N., Laperdina N. A., Chernova V. V.
ACOUSTIC EMISSION CONTROL OF THE EARLY STAGE OF DEFECTS DEVELOPMENT UNDER STATIC LOADING OF CARBON FIBER SAMPLES
(pp. 14-20)

Abstract. The method of acoustic emission (AE) control of the early stage of defects development under static loading of samples from carbon fiber T700 is developed. The finite element method was used to calculate the bearing capacity of carbon fiber samples and to apply an approach based on the use of the progressive damage model. The modal composition of AE signals is proposed to estimate the value of the structural coefficient determined using the wavelet transform. It is established that, if as the load increases there is a reduction of the structural coefficient, it is equivalent to the destruction of the matrix, and its increase was the destruction of the fibers. These provisions were confirmed by fractography, which showed that at a load of 18 kN, the dominant mechanism was the destruction of the matrix and its staining. On the thin sections made from samples where there are active location of AE signals, with a load of 32 kN was revealed not only the destruction of the matrix, but the torn fibers, bundles of fibers of the surface voids filled with a polishing suspension. THE fractography confirmed the results of the calculations of the loads which occur fracture of CFRP at early stages of development defects.

Keywords: carbon fiber reinforced plastic (CFRP), acoustic emission, defect, mode, matrix, fiber, delamination.

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V. A. Bataev (Novosibirsk State Technical University, Novosibirsk, Russia) E-mail: Данный адрес e-mail защищен от спам-ботов, Вам необходимо включить Javascript для его просмотра.
L. N. Stepanova, N. A. Laperdina (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. , Данный адрес e-mail защищен от спам-ботов, Вам необходимо включить Javascript для его просмотра.
V. V. Chernova (Siberian Transport University, 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., 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 fiberreinforced plastic samples during strength tests. Kontrol’. Diagnostika, (4), pp. 29-36. doi: 10.14489/td.2015.04.pp.029-036 [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. Testing. Diagnostics, (7), pp. 54-62. doi: 10.14489/td.2015.07.pp.054-062 [in Russian language]
3. Stepanova L. N., Bataev V. A., Chernova V. V. (2017). Research of CFRP samples’ damage during static loading with approach of acoustic emission technique and fractography. Defektoskopiia, (6), pp. 26-33. [in Russian language]
4. Tserpes K. I., Labeas G., Papanikov P., Kermanidis Th. (2012). Strength prediction of bolted joints in graphiteepoxy composite laminates. Composites: Part B 33, pp. 521- 529.
5. Chang F. K, Chang K. Y. (1987). A progressive damage model for laminated composites containing stress concentrators. Journal of Composite Materials, Vol. 21, pp. 834-855.
6. Cardoni M., Gianneo A., Giglio M. (2014). A low frequency lambwaves based structural health monitoring of an aeronautical carbon fiber reinforced polymer composite. Journal of Acoustic Emission, Vol. 32, pp. 1-20.
7. Zheng G. T., Backley M. A., Kister G. (2001). Blind deconvolution of acoustic emission signals for damage identification in composites. Journal AIAA, Vol.39, (6), pp. 1198-1205.
8. Sause, Markus G.R. (2013). Acoustic emission signal propagation in damaged composite structures. Journal of Acoustic Emission, Vol. 31, pp. 1-18.
9. Gorman M. (2011). Modal AE analysis of fracture and failure in composite materials, and the quality and life of high composite pressure vessels. Journal of Acoustic Emission, Vol. 29, pp. 1-28.
10. Workman G. L., Walker J., Lansing M. (1994). Acoustic method of damage sensing in composite materials. Alabama Univ. Material Processing Lab., NASA. – USA, pp. 42-45.

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DOI: 10.14489/td.2018.08.pp.022-029

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