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Diagnosis of Nonlinear Elastic Properties of The Boundary of Two Flat Rough Solids by Surface Acoustic Wavesтезисы доклада
- Авторы: Shirgina N., Korobov A.I., Kokshaiskiy A.
- Сборник: 2015 ICU Metz Abstract book
- Тезисы
- Год издания: 2015
- Первая страница: 91
- Последняя страница: 92
- Аннотация: The paper presents the results of experimental investigations of nonlinear elastic properties of boundary between two flat rough surfaces of solids. The plates made of aluminum and steel were used as the samples. The study of the elastic properties of the boundaries was carried out using surface acoustic waves (SAW). SAW at the interface of solids were excited and taken by wedge transducers at frequencies of 1.25 MHz and 2.5 MHz. Experimental studies were performed on automated ultrasonic complex RITEC RPR-5000. We investigated the effect of the static pres- sure applied to the boundary of two solids and the amplitude of the probing SAW of 1.25 MHz on SAW velocity and efficiency of SAW second harmonic generation on the frequency 2.5 MHz at the border of rough surfaces. The amount of pressure applied to the border varied in the range of 0-25 MPa. It was found that increasing the amplitude of the static pressure and the amplitude of probe SAW increases the velocity of SAW. SAW velocity change depending on the amplitude and the static pressure was nonlinear. According to the results of experimental measurements of the amplitudes of rst and second harmonics of the SAW on the rough edge of solids nonlinear acoustic parameter of the second order depending on the external pressure applied to the interface for xed values of the amplitude of the probe wave was calculated. The featuresof calculated nonlinear parameter are caused by changes in the contact acoustic nonlinearity with increasing external pressure applied to the border. The experimental esults were analyzed on the basis of the theory of contact acoustic nonlinearity. The studies were supported by the Russian Science Foundation (project N◦ 14-22- 00042).
- Добавил в систему: Ширгина Наталья Витальевна