ANALYSIS OF THE COMBINED EFFECTS OF THE ELASTIC CHARACTERISTICS OF LAYER ELASTIC VIBRATIONS IN THE PTA TRANSFORMATION
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Abstract
PTA conversion is one of the modern methods of generating elastic vibrations not only solids, but also liquids and biological objects. This method allows you to generate elastic load without contact, and in materials of low thickness. The only requirement for effective PTA transformation, transparency material - the transparent material the lower the efficiency of the method. Modern research methods based on numerical computer simulation. These methods make it difficult to analyze individual parameters of the sample to oscillatory process. The article describes the study of elastic waves using three-layer package full analytical expressions. Such an approach not only carry out numerical calculations, but analytically analyze the degree of influence on the elastic parameters of the material fluctuations. The analytical results describing the harmonic oscillations within the linear theory of thermoelasticity.
The proposed study of elastic waves depending multilayer package is a logical continuation of previous studies. In previous studies have already examined the dependence of amplitude and phase fluctuations apart from the change of the elastic modulus and Poisson's ratio of separately. The paper presents the dependence of the amplitude of three-layer packet boundaries, the action on it amplitude-modulated laser radiation, depending on the total change in the elastic modulus and Poisson's ratio.
Obtained in the results showed a significant contribution to the process fluctuation is Poisson's ratio. Young's modulus while almost no effect on the amplitude and phase of elastic waves. In addition, it was found that there are areas dependent amplitude (phase) characteristics of elastic waves with linear material, as well as some parts of essentially nonlinear dependence. Go one form of dependence (linear to nonlinear, linear or nonlinear) is accompanied by a turning phase change - is seen in the work presented in the phase characteristics
If we compare the results with previous analysis of the combined effects of thermal parameters on elastic vibrations, we can say that the thermal performance more tied together than elastic. Therefore, the analysis of thermal parameters should pay attention to the speed of elastic waves amplitude and their phase. But when analyzing the elastic characteristics necessary to measure the Poisson ratio, followed by calculation of the elastic modulus
Ref. 10, Fig. 3.
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