Tischenko

This article presents the results of quantitative assessment of process parameters which occur in materials of work pieces susceptible to cavitational-abrasive wear when in operation in aggressive fluid media. The authors propose a new algorithm for estimating the stress-strain state of materials of technical system’s elements affected by abrasive particles and micro water jets resulting from collapse of cavity pockets. Several hypotheses were introduced for describing this physical phenomenon; they were justified in this work. On the basis of the proposed algorithm evaluation calculations of existent parameters which allow one to make conclusions on the stress-strain state of several materials were performed. The obtained results were presented in the form of functional dependences.

This work justifies the necessity of developing a method of quantitative estimation of nozzle extension deterioration of water jet cutting equipment during continuous operation under given manufacturing modes. The proposed method consists of several major blocks; their function is forming various mathematical models which describe wearing processes. Simulation results of a hydro-abrasive jet in a nozzle extension were considered in this work along with interaction between abrasive particles and channel walls. Influence of the nozzle extension wear on the erosion rate of the processed material was also investigated. 

This article deals with application of ultra-jet diagnosis of materials, which is one of the most promising and complex methods allowing one to estimate durability of materials instantly under various conditions. A review of existent mathematical models which allow one to evaluate the depth of a honeycomb originated on the surface of a material as a result of ultra-jet influence. Requirements to the ultra-jet interaction model and the material being diagnosed were determined. On the basis of these requirements a model which could be used in the technique of the ultra-jet instant diagnosis was proposed.

 The article considers the application of ultra ink-jet express diagnostic to select the optimal functional coating and technology of application. It is shown that the ultra ink-jet diagnostic is a universal method for analyzing the wear resistance of coatings by real simulation of most types of mechanical wear: abrasive, hydroabrasive, hydroerosion, cavitation. The authors propose an opportunity to analyze the wear rate and fatigue wear in the development of physico-mathematical and probabilistic models, application of acoustic emission data and the use of macro-and mikrofraktographical analysis results.