Advanced Materials Research Vol. 1040

Abstract: The object of research is the process of forming metal preform with predetermined configuration under creep at high temperatures. Two deformation modes have been considered – “cold” and “hot”. The results of numerical modeling of two deformation modes using the system MSC Marc are presented.

Abstract: Rotor rotation with liquid layer on the chamber wall under viscoelastic action of the shaft within a planar model is examined in the article. The solution to the problem of determining the deflection of a rotating shaft with liquid filled chamber is given, which is important when designing an automatic balancing device. The issue of the cooperative motion of a solid body and liquid is considered in mathematical research. The set task is performed by applying D'Alembert's principle. The modeling results indicate that an increase in liquid’s mass in a rotor decreases its critical rotation speed; at the same time, the external friction accelerates the system’s self-centering. The developed mathematical models enable us to select the design parameters of a liquid-type autobalancer which operates within the set range of rotor’s angular velocity.

Abstract: The article presents the study of the treatment type effect on the structure, composition and properties of the boroaluminized layers. In the study a comparative analysis of boroaluminized layers obtained by isothermal, thermocycle boronaluminizing in pastes and laser heating is given.

Abstract: A brief analysis of the approaches to the evaluation of foundry technologies’ resource efficiency is presented. It is revealed that when evaluating resource efficiency researchers apply different criteria which do not allow them, on the one hand, to more objectively estimate the parameters and, on the other hand, to relate and compare the advantages and disadvantages of each of the assessment techniques. Representatives of one of the approaches to resource efficiency evaluation focus on determining the technological side, while representatives of the other approach emphasize the priority of the technological and economic aspects. Taking the example of analysing the problems of the technology of casting by gasified models, it has been demonstrated that the evaluation of resource efficiency cannot be unambiguous. Constant monitoring of the process is required. The authors come to conclusion that it is the method of expert evaluation that allows being more flexible in the evaluation of the resource efficiency of foundry technologies. The result of the conducted methodological assessment is the developed formula for estimating the resource efficiency of foundry technologies.

Abstract: The article gives a short target analysis of efficiency assessment as applied to casting techniques. Basic principles of efficiency assessment are defined. Efficiency criteria are proposed to optimize and quantify the efficiency of various prospective and existing foundry technologies. Functional, energy and resource criteria are selected as prime criteria. However, as shown in the article, energy criteria are the most common for comparison and assessment of manufacturing practices. The article reflects the fact that consumption of electrical, mechanical and other kinds of energy in socially-relevant production may be highlighted as an important indicator of technification in modern society development. The study leads us to the conclusion that the most common indicator of technification of any kind (social, informational, manufacturing, etc) is the efficient use of social time.

Abstract: Silver nanoparticles synthesized by a reagent less method involving only thermal treatment have been used in colorimetric assay for the detection of hydrogen peroxide. The silver nanoparticles were directly synthesized in polymethacrylate matrix (PMM) by method based on the reduction of the inorganic precursor AgNO₃, which was pre-adsorbed by PMM from solution, through thermal treatment. These silver nanoparticles were characterized using absorption spectroscopy. It was shown that the silver nanoparticles in PMM (Ag – PMM) had ability for reduction of hydrogen peroxide with silver oxidation. As a result, the yellow color of Ag – PMM samples was gradually changed to transparent color depending on the hydrogen peroxide concentrations. Hence, the silver nanoparticles in PMM could be used as colorimetric sensor for hydrogen peroxide in aqueous medium.

Abstract: The problems related to cardiovascular diseases are considered. The method to solve some of the problems has been proposed. We also consider a two-component Aliev-Panfilov model and the algorithm of the hardware-software complexes. The obtained results are presented.

Abstract: In present paper, possibilities for identification and verification of closure welds were discussed. It might be applied for nonproliferation purposes, where validity and reliability of verification are often crucial issue. Methodology of ultrasonic testing and signal processing procedure were proposed. Through set of experiments, the validity of proposed solution was approved.

Abstract: In present paper principles of acoustic scattering in case hardened components were discussed. Improvements of ultrasonic testing method and instrument development opportunities were proposed. Through these investigations, it would be possible to provide an advanced method of ultrasonic testing of case hardening quality, which might be applied in Russian metallurgical industry market. Comparative analysis of characteristics of existing instrument and the proposed instrument was conducted. This article demonstrates all important advantages of the proposed method of nondestructive testing for quality control of heavy-loaded components.

Abstract: For the development of a technique for cyclic deformation assessment using aluminum foil sensors glued onto the specimen surface the fatigue tests of carbon fiber reinforced polymer (CFRP) specimens were carried out. The DSLR camera mounted onto an optical microscope was used for capturing the images of sensors to reflect strain induced relief, which than was numerically estimated using various informative parameters in order to obtain the cyclic deformation assessment of composite. The results are discussed in view of application of this method for the development of Structural Health Monitoring (SHM) approach.