10.14489/td.2023.11.pp.004-014

2023, 11 November

DOI: 10.14489/td.2023.11.pp.004-014

Stepanova L. N., Chernova V. V., Sheifer S. V.
USING THE ACOUSTIC EMISSION METHOD, STRAIN GAUGE AND FRACTOGRAPHY TO ANALYZE THE PROCESSES OF DESTRUCTION OF SAMPLES FROM CARBON FIBER
(pp. 4-14)

Abstract. Static loading of Torayca T800 carbon fiber samples to failure was carried out, during which defects were registered using a microprocessor-based diagnostic acoustic emission (AE) system. The location of AE signals began in the area of the stress concentrator at loads not exceeding 30 kN. The analysis of the destruction process of samples at negative (–50 C) and positive (+80 C) temperatures was carried out. During their heating and cooling, thermal chambers were used, located in the region of a stress concentrator with a diameter of 12 mm. In the process of testing at a temperature of T = –50 C, an active location of AE signals was observed, corresponding, as shown by fractography, to delamination and destruction of the upper monolayers of carbon fiber. During tests carried out at a temperature of T = +80 C, AE signals were localized, caused by lateral delaminations located at the edges of the samples. Using wavelet transforms, an analysis was made of the features of changes in the main informative parameters of AE signals, and their relationship with the growth of damage (matrix, fiber, delamination) of the carbon fiber material.

Keywords: acoustic emission, strain gauge, fractography, temperature, static loading, composite structure, main informative signal parameters.

+ - About the Authors Click to collapse

L. N. Stepanova (FAI “Siberian Aeronautical Research Institute named after S. A. Chaplygin”, Novosibirsk, Russia) E-mail: aergroup@ ngs.ru
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.
S. V. Sheifer (FAI “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.

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