Acoustic emission method application while determining mechanical characteristics of the brnicrsi-2,5-0,6-0,7 wire for elastic elements production

Аuthors

Silaev M. Y.^*, Es’kova E. A.^**, Gerus D. S.^***, Remshev E. Y.^****

Baltic State Technical University “VOENMEH ” named after D.F. Ustinov, 1, 1st Krasnoarmeyskaya str., Saint Petersburg, 190005, Russia

*e-mail: Labmetcontrol@inbox.ru
**e-mail: katya_zarya@mail.ru
***e-mail: gds.ru97@mail.ru
****e-mail: Remshev@mail.ru

Abstract

A great number of electromechanical systems, an important part of which represents an elastic element from bronze, are applied in aerospace technology.

Severe requirements are placed to the physico- mechanical characteristics of these parts. The existing standard methods for mechanical properties determining are not sufficient for such products.

Acoustic emission method is one of the promising methods to solve this problem.

Acoustic emission is radiation of mechanical waves by the material, caused by local dynamic rearrangement of its structures This method is non destructive.

Beryllium bronze is used as a rule in special products. This project studies a cheaper substitute for Nickel-chromium-siliceous bronze.

Besides, mechanical tensile tests of the wire with parameters registration of acoustic emission were being conducted. Bronze was subjected to various heat treatment to select the optimal mode.

As the result of this work, the microstructure of the samples was studied for various thermal treatment modes. It was revealed that the acoustic emission parameters were the figures of strength and plasticity.

The strength and plastic characteristics are related to the grain size by the dependence proposed by Hall- Petch. This dependence modernization allowed adopt the stress at maximum value of the pulse amplitude up to the yield point achieving as the stress corresponding to the dislocations motion start.

The possibility of determining the microplastic deformation starting of wire samples by AE method was established. Based on the obtained regularities, it was revealed that the number of signals is a characteristic of strength, while the amplitude is a characteristic of plasticity. The Hall-Petch dependence modernization may allow developing a technique for operational control of microstructure in the release of special products.

Keywords:

elastic elements, mechanical characteristics, tensile tests, strength, electromechanical systems, acoustic emission method

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