I.Yu. Solodov

Bio: I.Yu. Solodov is an academic researcher. The author has contributed to research in topics: Physical acoustics & Nonlinear acoustics. The author has an hindex of 4, co-authored 6 publications receiving 201 citations.

Review / Sythèse Nonlinear acoustic applications for material characterization: A review

Abstract: The nonlinear acoustic applications for material characterization are reviewed. The general theoretical analysis of the effects of nonlinearity, dissipation, dispersion, and diffraction on intense ...

Nonlinear NDE using contact acoustic nonlinearity (CAN)

Abstract: Acoustic nonlinear properties of a nonbonded solid-state contact compressed by a static load were studied experimentally. Main attention was paid to a lflappingr CAN mechanism attributed to the contact discontinuity caused by an acoustic wave. Sub- and super- harmonic generation and chaotic CAN behavior were registered in the experiment. CAN was shown to be responsible for an efficient nonlinear scattering of SAWs providing inverse spectral composition of a reflected wave. The feasibility of reflection-mode nonlinear NDE of small surface fractured defects was also demonstrated

The Second Harmonics Generation of Bulk Acoustic Wave Reflection

Abstract: The nonlinear effect of both bulk and surface acoustic wave have been examined by many authors. It was found that the nonlinear surface effect is generally stronger than the bulk one and has been applied in various nonlinear surface wave devices. The reflection of the bulk wave has the same feature of nonlinear surface effects, and has not been studied yet. In this paper the shear wave is incident form a relatively linear medium and reflected by a nonlinear material. Theoretically the reflected second harmonic wave related to the nonlinearity of the reflective material and becomes so large at the vicinity of critical incident angle that it could be obseved obviously. the reflection of bulk shear wave on the boundary of two nonlinear media is also investigated in this paper. The nonlinearity of incident medium has no significant influence on the reflected second harmonic waves at the vicinity of critical angle. The results show that the transmitted fundamental waves and the nonlinearity of reflective medium play a predominant role for the generation of reflected second harmonics.

Nonlinear acoustic spectroscopy of cracked flaws and disbonds: Fundamentals, techniques, and applications

Abstract: Classical nonlinear acoustics of solids operates with distributed material nonlinearity related to unharmonicity of molecular interaction forces. Weakening of molecular bonds in a defect area or intermittent lack of elastic coupling between the faces of a vibrating crack or unbond (“clapping”) results in anomalously high local contact acoustic nonlinearity (CAN). CAN properties and spectral features are different from those of the classical analog and important to develop new acoustic NDE techniques. Three approaches to nonlinear NDE methodology have been experimentally verified: low-frequency (hundreds of Hz) vibration technique, intermediate-frequency (hundreds of kHz) standing wave and high-frequency (tens of MHz) propagation modes. Low-frequency nonlinear contact vibrations revealed multiple sub- and super-harmonics generation featuring non-monotonous (sinx/x type) spectra. Parametric instability observed in resonator with a nonlinear contact leads to the output spectrum splitting up into successive s...

Acoustic reflectivity enhancement using higher-order nonlinear reflection mode

Abstract: Acoustic wave reflection is studied for sharp nonlinear inhomogeneities embedded into nonlinear medium with similar linear characteristics. The higher-order nonlinear reflection mode is used to increase the reflectivity of such inclusions "invisible" in a linearly reflected field. For YZ-LiNbO/sub 3/ the discontinuity in nonlinear properties was measured to be the most dramatic for the SAW third harmonic generated in the area of the contact acoustic nonlinearity (simulating a closed crack) and acousto-electronic nonlinearity (piezoelectric-semiconductor structure). The experiments revealed from 3 to 4 orders of magnitude increase in reflectivity of the nonlinear inhomogeneities for the third-order nonlinear reflection mode.

Review of Second Harmonic Generation Measurement Techniques for Material State Determination in Metals

Abstract: This paper presents a comprehensive review of the current state of knowledge of second harmonic generation (SHG) measurements, a subset of nonlinear ultrasonic nondestructive evaluation techniques. These SHG techniques exploit the material nonlinearity of metals in order to measure the acoustic nonlinearity parameter, $$\beta $$ . In these measurements, a second harmonic wave is generated from a propagating monochromatic elastic wave, due to the anharmonicity of the crystal lattice, as well as the presence of microstructural features such as dislocations and precipitates. This article provides a summary of models that relate the different microstructural contributions to $$\beta $$ , and provides details of the different SHG measurement and analysis techniques available, focusing on longitudinal and Rayleigh wave methods. The main focus of this paper is a critical review of the literature that utilizes these SHG methods for the nondestructive evaluation of plasticity, fatigue, thermal aging, creep, and radiation damage in metals.

A study of the vibro-acoustic modulation technique for the detection of cracks in metals

Abstract: One implementation of the vibro-modulation technique involves monitoring the amplitude modulation of an ultrasonic vibration field transmitted through a cracked specimen undergoing an additional low frequency structural vibration If the specimen is undamaged and appropriately supported, the two vibration fields do not interact This phenomenon could be used as the basis for a nondestructive testing technique In this paper, the sensitivity of the technique is investigated systematically on a set of mild steel beams with cracks of different sizes and shapes A damage index was measured for each crack The correlation obtained between the crack size and the strength of the modulation is fairly poor The technique proved extremely sensitive to the initial state of opening and closing of the crack and to the setup due to the modulating effects of contacts between the specimens and the supports A simple model is proposed which explains the main features observed and approximately predicts the level of sideband obtained experimentally

Nonlinear interaction of plane ultrasonic waves with an interface between rough surfaces in contact.

Abstract: A theoretical investigation of the nonlinear interaction between an acoustic plane wave and an interface formed by two rough, nonconforming surfaces in partial contact is presented. The macroscopic elastic properties of such a nonlinear interface are derived from micromechanical models accounting for the elastic interaction that is characteristic of spherical bodies in contact. These results are used to formulate set of boundary conditions for the acoustic field, which are to be enforced at the imperfect interface. The scattering problem is solved for plane wave incidence by using a simple perturbation approach and the harmonic balance method. Sample results are presented for arbitrary wave polarization and angle of incidence. The relative magnitude of the nonlinear signals and their potential use toward the nondestructive evaluation of imperfect interfaces are assessed. In particular, attention is drawn to the enhanced nonlinear response of an interface insonified by a shear vertical wave in the neighborhood of the longitudinal critical angle. The motivation for this investigation is provided by the need to develop nondestructive methods to detect and localize small, partially closed cracks in metals with coarse microstructures.

Review of nonlinear ultrasonic guided wave nondestructive evaluation: theory, numerics, and experiments

Abstract: Interest in using the higher harmonic generation of ultrasonic guided wave modes for nondestructive evaluation continues to grow tremendously as the understanding of nonlinear guided wave propagation has enabled further analysis. The combination of the attractive properties of guided waves with the attractive properties of higher harmonic generation provides a very unique potential for characterization of incipient damage, particularly in plate and shell structures. Guided waves can propagate relatively long distances, provide access to hidden structural components, have various displacement polarizations, and provide many opportunities for mode conversions due to their multimode character. Moreover, higher harmonic generation is sensitive to changing aspects of the microstructures such as to the dislocation density, precipitates, inclusions, and voids. We review the recent advances in the theory of nonlinear guided waves, as well as the numerical simulations and experiments that demonstrate their utility.