Vibro-impact in rolling contact

Irregular wavy residual damages (troppy phenomenon) occur in the contact area in rolling friction as the result of a nonstationary process of cyclic deformation. They initiate vibro-impact loading of an active system. The results of experimental study of these damages are given. Theoretical model satisfactory describing troppy phenomenon is developed

Nonequilibrium plasmachemical processes - the basis of future plasma technologies

Laws of molecule excitation in basic electronic condition have been considered. It was shown that nonequilibrium excitation of oscillatory degrees of molecule freedom was the most effective for initiation of chemical reactions. Plasmachemical processes proceeding in such conditions have a number of advantages allowing at their use in traditional manufactures decreasing power inputs and increasing productivity. Conditions realized at pulse excitation of gas mixes are also favorable for organizing chain chemical processes. Experimental data of chain chemical process realization in plasma of pulse electronic beam were presented. Other perspective plasma technologies - pulse radiolysis of liquid phase hydrocarbons at low temperature in conditions of electronic beam influence with high current density,initiation of carbon-black formation process in nonequilibrium conditions were also considere

Mechanothermodynamical system and its behavior

An attempt to formulate the basic principles of mechanothermodynamics of systems is made. The notion of tribo-fatigue entropy generated in a mechanical system is introduced similarly to thermodynamic entropy governed by matter and energy exchange. Interrelation of motion, damage, and information is found. It is shown that motion generates new information in the system if its damageability index is non-zero. The information is positive if the system is hardened and negative if it softened. It leads one to perceiving the principal feature of interaction of irreversible damages (effective energies and entropy) generated by effects of different nature (mechanical loads, heat flows, etc.), viz. dialectic character of interaction. Two principles of thermodynamics are formulated

On the Development of Mechanothermodynamics as a New Branch of Physics

This paper aims to substantiate and formulate the main principles of the physical discipline-mechanothermodynamics that unites Newtonian mechanics and thermodynamics. Its principles are based on using entropy as a bridge between mechanics and thermodynamics. Mechanothermodynamics combines two branches of physics, mechanics and thermodynamics, to take a fresh look at the evolution of complex systems. The analysis of more than 600 experimental results allowed for determining a unified mechanothermodynamical function of limiting states (critical according to damageability) of polymers and metals. They are also known as fatigue fracture entropy states

Vibro-impact in rolling contact

Irregular wavy residual damages (troppy phenomenon) occur in the contact area in rolling friction as the result of a nonstationary process of cyclic deformation. They initiate vibro-impact loading of an active system. The results of experimental study of these damages are given. Theoretical model satisfactory describing troppy phenomenon is developed

A Model of Mechanothermodynamic Entropy in Tribology

A brief analysis of entropy concepts in continuum mechanics and thermodynamics is presented. The methods of accounting for friction, wear and fatigue processes in the calculation of the thermodynamic entropy are described. It is shown that these and other damage processes of solids are more adequately described by tribo-fatigue entropy. It was established that mechanothermodynamic entropy calculated as the sum of interacting thermodynamic and tribo-fatigue entropy components has the most general character. Examples of usage (application) of tribo-fatigue and mechanothermodynamic entropies for practical analysis of wear and fatigue processes are given

Corrosion-Mechanical Fatigue: the Problems of Forecasting. Part 2. Reverse Effect. Influence of Stresses on the Corrosion Rate

Corrosion is one of the main electrochemical processes that damage metal materials. The combination of cyclic stresses and a corrosive environment causes wear-fatigue damage, called corrosion-mechanical fatigue. The paper investigates the problem of predicting this type of wear-fatigue damage, which occurs in almost all branches of technology, especially in the chemical, oil, metallurgical industries, transport. The work consists of several parts. In the first part a technique for estimating the fatigue limit in a given corrosive environment (direct effect) is developed. The second part analyzes the reverse effect, i.e. the effect of acting stresses on the corrosion rate of metals and alloys, and proposes a method for predicting corrosion-erosion damage with the reverse effect based on the energy criterion. In the future, it is planned to discuss the mechanisms of corrosion-mechanical fatigue with direct and reverse effects at different stages of complex damage

Investigation of isotopic composition of plasmachemical conversion products of sulfur hexafluoride

The results of investigation of sulfur hexafluoride decomposition in mixture with hydrogen and oxygen in plasma of pulsed electron beam formed by accelerator TEA-500 (350...500 kV, 60 ns, current density 0,3...0,4 kA/cm2) have been presented. The data of thermodynamic simulation of gas mixture SF6+O2 and SF6+H2+O2 conversion in low-temperature plasma and gas mixture composition after electron beam influence measured by mass-spectrometer are given. It is shown that the formed gas-cycle compound synthesized in plasma of pulsed electron beam is sulfur difluoride-oxide. Isotope analysis of (SOF)+ and (SOF2)+ ions is carried out. It is obtained that sulfur isotope 34S content in sulfur difluoride-oxide exceeds its content in initial sulfur hexafluoride in 1,8±0,1 time