Article

Article title ABOUT A STRING OF MULTIPLE REVERBERATIONS OF ULTRASONIC PULSE IN PLANE-PARALLEL SAMPLES WITH HARMONICALLY VARYING MECHANICAL STRESSES
Authors M.I. Slasten, V.I. Timoshenko
Section SECTION I. ACOUSTICS AND HYDROACOUSTICS
Month, Year 12, 2015 @en
Index UDC 620.179.16
DOI
Abstract Nowadays acoustic mono-crystal is increasingly used in different fields of modern radio-electronics, laser equipment, optical and acoustic devices of information processing and so on. Providing sufficient reliability of devices requires effective methods development of ultrasonic control of their properties while growing mono-crystals and producing devices on their basis. The technology of growing mono-crystals is constantly improving that also requires control methods improvement of their properties. Ultrasonic control of mono-crystals quality is elaborated directly for each separate mono-crystal taking into account the type of its crystal lattice, elastic properties, etc. Gallium gadolinium garnet with cubic lattice, elastically isotropic but optically unisotropic is under consideration. The main defect arising while growing mono-crystals of gallium gadolinium garnet is the presence of residual mechanical stresses negatively influencing the work of data processing, for example, and so on. The diagnostics of residual mechanical stresses and their identification – clarifying the character of stress state – are made using a number of multiple reverberations of impulse spreading in a plane-parallel sample of mono-crystal. The most perspective modern technology of growing mono-crystals of gallium gadolinium garnet results in arising residual mechanical stresses, in growing mono-crystal bars, with the arrangement of alternating pressed and stretched layers close to harmonic one. Such an arrangement of more or less pressed and stretched layers leads to a string of repeatedly reverberated impulses with a peculiar nontraditional side-wave of a string. Besides, echo-impulses amplitudes in a string generally characterize heterogeneity of stressed state and are not connected with the quantity of residual mechanical stresses. Echo-impulses amplitudes in a string can be equal up to zero with the sufficient quantity of residual mechanical stresses.

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Keywords Stress state; residual mechanical stresses; harmonic arrangement of residual mechanical stresses; ultrasonic control; acoustic diagnostics; identification of mechanical stresses; multiple reverberations; echo-impulses string; acoustic mono-crystals; mono-crystal bars.
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