Zaspa Y.P.,Khmelnitskii National University
Journal of Friction and Wear | Year: 2012
External friction is treated as the self-coordinated preprocess of dynamic interaction between deformable solids based on the wave-pulse transfer. A direct link between the wear mechanisms and the run-in is demonstrated when the coherence and the tribosystem resonance frequencies is established. The visualization of autowave motion is exemplified at external friction and resonance automodulation of contact friction under force and cinematic loading. The mechanisms of reducing the resonance friction force are considered in different velocity ranges. The method of quantitative spectral acoustic emission analysis is advanced when it is generated in the friction zone. The known experimental finding is analyzed in the acoustic emission range from the point of view of the harmonization of the dynamic interaction in the tribosystem. The examples are shown of how the tribosystem functions in the faser mode of a friction ultrasound quantum generator based on the forced phonon emission. © 2012 Allerton Press, Inc.
Shalapko Y.I.,Khmelnitskii National University |
Tarasova T.V.,Moscow State University
Journal of Friction and Wear | Year: 2013
A model of dynamic effect during low-amplitude oscillations of surfaces comparable with the preliminary displacement and the first acts of sleep under the oscillating tangential loading of the contact is developed. Solving a system of differential force balance equations has yielded the main characteristics of the process of the dynamics of a nominally stationary contact depending on the governing parameters of the system. Regularities of the friction characteristic at low sliding velocity are determined with allowance for the preliminary displacement phenomenon, the Stribeck effect, as well as the parameter of the plasticity and viscosity of friction. The model allows one tracing the evolution of relative displacements and slip velocities, calculating phase diagrams, as well as deriving the friction characteristic and real slip amplitudes typical of the mixed friction mode and low-amplitude fretting. © 2013 Allerton Press, Inc.
Zaporozhets O.A.,Taras Shevchenko National University |
Pogrebnyak O.S.,Khmelnitskii National University
Journal of Analytical Chemistry | Year: 2012
We have developed procedures for the spectrophotometric determination of ClO -, BrO 3 -, and IO 3 - in waters of different origin. The procedures are based on the oxidation of N,N-diethylaniline in acidic media and their detection limits (by 3s criterion) are 0.04, 0.18, and 0.53 μg/mL, respectively. The calibration curves are linear in the concentration ranges 0.1-2.0, 0.4-12.5, and 1.6-40 μg/mL, respectively. The procedures provide simple and rapid determination of these analytes. © 2012 Pleiades Publishing, Inc.
Pastukh I.M.,Khmelnitskii National University
Technical Physics | Year: 2013
It is found that during glow-discharge nitriding, the flow bombarding the surface contains fast neutral particles that play a significant role in realization of the process along with charged particles. © 2013 Pleiades Publishing, Ltd.
Zaspa Y.P.,Khmelnitskii National University
Journal of Friction and Wear | Year: 2011
On the example of a simple tribosystem in the form of a body sliding (rolling) over an inclined plane, it is demonstrated that the kinematic concept of external friction based on the Amonton-Coulomb law of modifications is not appropriate as a base for the study of the dynamics of external friction. The obtained dynamic friction characteristics in respect to the velocity and acceleration prove that the velocity of motion varies and that the dynamic equations are nonlinear both in respect to velocity and acceleration. The mechanism of dynamic feedback in tribosystems ensures both subordination to external effects and the capacity for effective synthesis of relevant motion types. The problem is analyzed of selecting adequate design types of motion elements of a tribosystem in relation to the frictional self-excited vibrations and the metrology of measuring the coefficients of sliding and rolling friction. In view of the high complexity of a priori modeling of external friction, it is concluded that methods of experimental tribodynamics should be developed. © 2011 Allerton Press, Inc.