OAO NPO Central Research Institute for Machine Building Technology

Moscow, Russia

OAO NPO Central Research Institute for Machine Building Technology

Moscow, Russia
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Ushakov V.M.,OAO NPO Central Research Institute for Machine Building Technology | Davydov D.M.,OAO NPO Central Research Institute for Machine Building Technology | Domozhirov L.I.,OAO NPO Central Research Institute for Machine Building Technology
Russian Journal of Nondestructive Testing | Year: 2011

The problem of measuring the dimensions of safe cracks by the acoustic method was considered on the basis of the concept of safe cracks. The results of investigations are presented and the obtained data on the detection and measurement of the depth of surface cracks using Rayleigh waves at artificial reflectors of the surface-notch type and at real cracks and specimens, which are subjected to cyclic loads during the "growth" of fatigue cracks, are analyzed. © Pleiades Publishing, Ltd., 2011.


Danilov V.N.,OAO NPO Central Research Institute for Machine Building Technology | Voronkov I.V.,OAO NPO Central Research Institute for Machine Building Technology
Russian Journal of Nondestructive Testing | Year: 2011

The specific features of the influence of such factors as the damping of a longitudinal wave in a medium, its transformation into a transverse wave during transmission, and the radiation directivity of array elements on the characteristics of a signal of a normal linear phased-array transducer are considered. Very simple methods for taking these factors into account are presented. It is noted that increasing the dimensions of array elements may lead to a significant reduction of the amplitude of the total transmitted signal in the transducer near-field zone. © 2011 Pleiades Publishing, Ltd.


Danilov V.N.,OAO NPO Central Research Institute for Machine Building Technology
Russian Journal of Nondestructive Testing | Year: 2010

Exact and approximate (estimating) transformation indicatrices of plane transverse (longitudinal) waves, which are incident on a crack in the form of a strip and are transformed into longitudinal (transverse) waves, are studied. It is confirmed that during an unrestricted increase in crack size, the transformation coefficients tend to the corresponding limiting values for an infinite free plane boundary. The exact and estimated transformation indicatrices of elastic waves are numerically compared. © 2010 Pleiades Publishing, Ltd.

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