Integrated Technologies and Energy Saving最新文献

{"title":"STUDY OF THE FEATURES OF GEL FORMATION AND RHEOLOGICAL PROP-ERTIES OF HYDROGELS BASED ON AGAR-AGAR","authors":"K. Lebedeva, A. Cherkashina, D. Savchenko, V. Lebedev","doi":"10.20998/2078-5364.2022.3.05","DOIUrl":"https://doi.org/10.20998/2078-5364.2022.3.05","url":null,"abstract":"The article shows studies on the study of the kinetics of gelation and the features of the rheological properties of hydrogels based on agar-agar. It has been found that hydrogels have attracted a lot of attention in the last 50 years due to their exceptional wide range of applications. They have a certain degree of elasticity, very similar to natural fabrics due to the high water content. Within the framework of the literature review, it has been shown that polymer hydrogels are usually obtained by polymerization of water-soluble unsaturated compounds in the presence of a bifunctional cross-linking agent or by structuring pre-prepared reactive prepolymers. The ability of polymer hydrogels to undergo bulk transitions between swollen and collapsed phases under the action of an external medium is one of the most important and universal properties of these materials. It has been shown that polymer hydrogels are known that are used as inert matrices for the controlled release of pre-absorbed biologically active substances. In this case, the release rate of the biologically active substance is determined by the nature and structure of the hydrogel polymer framework. The article studies the kinetics of gelation and the features of the rheological properties of hydrogels based on agar-agar in order to obtain modern biocompatible materials for the medical, cosmetological and pharmaceutical industries. It is shown that in compositions that consist exclusively of agar-agar and water, the shortest time for loss of stickiness and film formation is observed. At the same time, with an increase in the content of agar-agar from 25 to 50 %, one can see the most rapid processes of loss of stickiness and film formation. Compositions with the longest time for loss of stickiness and film formation were determined, which contain 25 % agar-agar and 50 % milk and honey, because they will be characterized by a long diffusion time of active substances to the human body. The scientific novelty of the study is related to the study of the effectiveness of gelation in conditions of highly concentrated agar-agar solutions with different contents of the polymer part and active substances, on the basis of which compositions for the preparation of face masks and medical tapes are proposed.","PeriodicalId":334981,"journal":{"name":"Integrated Technologies and Energy Saving","volume":"84 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116955433","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"REPEATED WASTE OF HUMATIVES INTO PLAIN METALS IN THE PURIFICATION OF WEAKLY ACID WATER, TO CLEAN Cu2+, Pb2+","authors":"K. Rudneva","doi":"10.20998/2078-5364.2022.2.04","DOIUrl":"https://doi.org/10.20998/2078-5364.2022.2.04","url":null,"abstract":"Destroyed military and industrial facilities have grave consequences not only for the country's economy, but also for the environment and natural resources. At present, humic acids are quite well known and have been sufficiently studied by the natural sorbent. Due to a wide range of functional groups, they perform accumulative, transport, regulatory, protective and physiological functions. The interaction of metal ions with humates does not have a single clear described mechanism. This is facilitated by the complexity and diversity of the structure of humic acids, as well as various reaction conditions in laboratory and natural conditions. Therefore, ways to increase the efficiency of sorption, improve and search for new properties of these substances still remain relevant. \u0000In this work, the possibilities of reverse bonding of copper and lead ions in slightly acidic aqueous solutions at pH values of 4,4–6,3 are shown. Humic acids were isolated from peat and brown coal, and potassium humates produced in China were also used. In this study, model solutions of copper (II) sulfate and lead (II) acetate were used with a calculated concentration in terms of copper and lead of about 400 and 1000 mg/dm3, respectively. The regeneration of metal humate complexes was carried out by lowering the pH of the medium to 2,1–2,2. The degree of lead sorption was 97–99 % for Pb2+ solutions with a concentration of 216 mg/dm3. Studies have shown the effectiveness of re-use of regenerated humates with a degree of metal release of 85–91 % in relation to the sorbed amount. \u0000The metal content in the experiment was determined by inductively coupled plasma atomic spectroscopy. \u0000It was also found that the ratio of the average values of the specific sorption of lead and copper was from 2,8 to 3,1 for various types of humic acids (humates). The proximity of these values with respect to the atomic masses of lead and copper (3,3), in the author's opinion, is associated with the interaction of copper and lead ions with humates in a stoichiometric ratio due to a chemical reaction (reactions). The sorption given in the experiment is described by a linear dependence in the coordinate system: the mass of the sorbed metal (ions) – the mass of humates.","PeriodicalId":334981,"journal":{"name":"Integrated Technologies and Energy Saving","volume":"498 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-07-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123563320","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"PINCH-INTEGRATIONAL OPTIMIZATION OF HEAT EXCHANGE NETWORK OF THE HYDROLYTIC SULFURIC ACID CONCENTRATION PROCESS","authors":"V. Ved, A. Myronov, M. Ilchenko, K. Gorbunov, H. Ponomarenko, I. Skliarov","doi":"10.20998/2078-5364.2022.2.02","DOIUrl":"https://doi.org/10.20998/2078-5364.2022.2.02","url":null,"abstract":"The paper considers the question of the possibility of thermal energy saving at an industrial enterprise. As a means of optimizing energy consumption, one of the methods for integrating chemical-technological processes, pinch analysis, was used. It has been established that the problems of significant energy consumption are relevant for researchers and industrialists around the world, and scientists see their solution primarily in the development of alternative energy sources and modern methods of energy saving with well-predictable results. It is indicated that the target functions in this case can be combined: financial-energy and energy-environmental, since exactly these kinds of results are provided by the very essence of energy-and-resources saving applied to the industrial process. \u0000At the initial stage of the study, an analysis of thermal energy consumption structure provided by apparatuses in hydrolytic sulfuric acid concentration process was made. Based on its results, it was found that the existing minimum temperature difference in the system is far from the optimal and technically achievable value. Taking into account the confirmed energy-saving potential, its value was estimated. For this, the value of the present heat recovery in the system is established through calculation, and the volume of energy coming from external heat carriers and refrigerants is determined. Based on the calculation results, a Grid diagram and Composite curves of the specified technological process were constructed. \u0000At the second stage, optimization measures, which began with the choice of a new, lower value of the minimum temperature difference for the entire heat exchange network of this industrial plant, were carried out. For this value, shifted composite curves were constructed and an updated grid diagram was developed. In the integrated heat exchange network, there is three additional recuperative heat exchanger and were revised the operating modes of devices that it was decided to save. Based on the optimization results, a technological scheme of the hydrolytic sulfuric acid concentration process was designed while maintaining the key elements of the production technology. \u0000The result of the work is an optimized heat exchange network of the industrial enterprise section, which makes it possible to increase the thermal energy recuperation by 32,7 %, while reducing the consumption of external heat carriers by 30,3 %, as well as external refrigerants – by 50,1 %. The results obtained indicate a very high economic efficiency and a prospects of implementation the project into production.","PeriodicalId":334981,"journal":{"name":"Integrated Technologies and Energy Saving","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-07-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131392973","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"STUDY OF BIODEGRADABLE FILMS BASED ON CELLULOSE ETHERS WITH BACTERICIDAL PROPERTIES","authors":"V. Lebedev, D. Miroshnichenko, D. Savchenko, T. Tykhomyrova, N. Zabiiaka","doi":"10.20998/2078-5364.2022.2.05","DOIUrl":"https://doi.org/10.20998/2078-5364.2022.2.05","url":null,"abstract":"The article shows research on the development of the latest biodegradable films with bactericidal properties based on hydroxypropylmethylcellulose modified with brown coal humic acids. Hybrid biodegradable films with bactericidal properties were obtained by pouring solutions of hydroxypropylmethylcellulose with a concentration of 2 wt.%, to which different amounts of humic acid were added. When obtaining biodegradable films with bactericidal properties, hydroxypropylmethylcellulose of the Walocel™ brand manufactured by Dow Corning (USA) was used. As hybrid modifiers, humic acids were used, obtained by extraction of brown coal with an alkaline solution of sodium pyrophosphate, followed by extraction with a 1% sodium hydroxide solution and precipitation with mineral acid. Determination of water absorption of samples of biodegradable films in cold water was carried out according to ISO 62:2008, tensile strength properties of biodegradable films were determined according to ISO 527-2:2021, to measure the gas permeability of biodegradable films, the differential pressure method and a vacuum tester VAC-V1 were used. The effect of the hybrid modification of hydroxypropylmethylcellulose with lignite humic acids in terms of the studied performance characteristics increased in the direction of lignite humic acid types No. 3> No. 2> No. 1. It has been shown that hybrid modification by the mechanism of matrix synthesis of biodegradable films with bactericidal properties based on hydroxypropylmethylcellulose with brown coal humic acids makes it possible to reduce their water absorption, increase the basic strength characteristics and impart antibacterial properties to them, which is confirmed by the data on the time of mold appearance. Optimum in terms of strength and performance characteristics are biodegradable films with bactericidal properties at a content of 10% wt. humic acids No. 3. In general, it has been established that hybrid modification with humic acids according to the mechanism of matrix synthesis of biodegradable films based on hydroxypropylmethylcellulose makes it possible to obtain durable water-soluble films with antibacterial properties for use as packaging for dry food products (bread, cereals, nuts, etc.) with an extended shelf life. storage.","PeriodicalId":334981,"journal":{"name":"Integrated Technologies and Energy Saving","volume":"116 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-07-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128068519","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"THERMODYNAMIC ANALYSIS OF THE CHEMICAL RESISTANCE OF CERAMIC MATERIALS IN THE RO- Al2O3-SiO2 SYSTEM","authors":"G. Lisachuk, R. Kryvobok, V. Shumeiko, Y. Tur, V. Voloshchuk","doi":"10.20998/2078-5364.2022.2.03","DOIUrl":"https://doi.org/10.20998/2078-5364.2022.2.03","url":null,"abstract":"Operational characteristics, properties of modern aircraft and aerospace devices and their technical characteristics owe a lot to the radio engineering systems that are installed on them. Therefore, their protection and the selection of the necessary ceramic material, which will ensure the protection of electronic devices from interaction with the external environment, is an important task of modern materials science. \u0000In order to substantiate the choice of a crystalline phase as the basis of a radio-transparent ceramic material that will be used in aggressive environments, it is advisable to conduct thermodynamic calculations, namely changes in the Gibbs free energy of chemical reactions of the interaction of the crystalline phase with an aggressive environment. To carry out thermodynamic calculations of chemical stability reactions, the three-component system RO- Al2O3-SiO2 (RО – SrО, BaО) was chosen and the crystalline phases that can exist within them were determined. When choosing experimental crystalline phases, a complex of physico-chemical and operational requirements for radio-transparent materials was taken into account. From the point of view of thermodynamics, the corrosion behavior of the selected crystalline phases: celsian BaO·Al2O3·2SiO2, slavsonite SrO·Al2O3·SiO2, SrO·SiO2, and 2SrO·SiO2 is considered. \u0000The paper presents the results of thermodynamic calculations of changes in enthalpy, entropy, and Gibbs free energy of reactions to determine acid resistance (HСl, H2SO4, HNO3) and alkali resistance (NaОН, Na2CO3) of these compounds under standard conditions. It was established that all considered compounds have a thermodynamic probability of corrosion resistance to the action of alkaline reagents. In relation to an acidic environment, under normal conditions, celsian and slavsonite show acid resistance to hydrochloric acid, and they are least prone to interaction with sulfuric acid, but are able to actively interact with HNO3. Regarding the investigated binary compounds SrO·SiO2 and 2SrO·SiO2, all calculated reactions are thermodynamically favorable, i.e. interaction with acidic reagents occurs. \u0000The obtained results are analyzed and the correlation of the calculations of the reaction of celsian and hydrochloric acid with experimental data is given. It was concluded that it is rational to plan the production of ceramic products based on celsian and slavsonite or their heterophase mixture with a minimum content of binary oxides of strontium and barium.","PeriodicalId":334981,"journal":{"name":"Integrated Technologies and Energy Saving","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-07-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130733732","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"SYNTHESIS OF HIGHLY EFFICIENT SORBENTS FROM PLANT WASTE","authors":"E. Elnaggar","doi":"10.20998/2078-5364.2022.2.06","DOIUrl":"https://doi.org/10.20998/2078-5364.2022.2.06","url":null,"abstract":"The possibility of creating a wide range of carbon adsorbents is greatly facilitated by the variety of the initial carbon-containing raw materials and technologies for its processing. At present, the main raw materials for the industrial production of adsorbents are wood, fossil coal, peat, remnants of processing of agricultural raw materials, and some polymeric materials. Lignin and carbon black (soot) are used much less frequently. However, potentially carbon adsorbents can be obtained from a much wider range of solid, liquid and gaseous carbonaceous substances, many of which are currently considered only useless domestic and industrial waste. Thus, adsorbents with satisfactory characteristics, active in specific technological processes, can be synthesized from waste wood and bark, lignin and the pulp and paper industry, activated sludge, associated gases, etc. On the basis of it was received by the sorbent capable to catch oil. Its capacity is 1–2 g/g, but the cleaning efficiency can reach 90 %. The black ash walnut shell has excellent absorption properties and is not inferior in quality to the best brands of activated carbon. Surface treatment of water or wastewater proposed sorbent was carried out at 0–100 °C. Regeneration of used sorbent spend its processing hydrocarbon solvents (gasoline, kerosene, etc.) or organic solvents (alcohols, etc.) or mixtures thereof.","PeriodicalId":334981,"journal":{"name":"Integrated Technologies and Energy Saving","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-07-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134199037","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"THE INFLUENCE OF DIFFERENT FACTORS ON THE MAISOTSENKO CYCLE EFFECTIVENESS","authors":"O. Stupak, T. Donik, A. Khalatov","doi":"10.20998/2078-5364.2022.2.01","DOIUrl":"https://doi.org/10.20998/2078-5364.2022.2.01","url":null,"abstract":"An important problem in the heat industry is the significant cost of energy resources for air conditioning. Therefore, energy-efficient refrigeration systems based on renewable energy sources and evaporative air cooling, as well as air-conditioning systems according to the Maisotsenko cycle using psychrometric energy of the environment are of great importance. This paper presents the results of experimental and numerical research of the influence of various factors on the efficiency of indirect evaporative heat and mass transfer apparatus on the M-cycle on the basis of a new unit cell. \u0000An experimental stand of a heat and mass transfer apparatus with vertically arranged plate channels was developed for experimental research. Experimental studies of heat and mass transfer in the new unit cell were conducted in a wide range of Reynolds numbers 200…1200, temperature 16… 30 °С, relative humidity 30… 50 %. The calculated study was performed using a modified ε-NTU method. Studies have shown that the thermodynamic efficiency of a wet bulb thermometer at a Reynolds number below 500 exceeded one. According to the results of computational studies, the influence of cell length and surface intensification of dry channels on thermodynamic efficiency was determined. Shown the effect of changes in thermodynamic efficiency in the range of 86…94 % increase in efficiency by 1 % leads to an increase in cell length by 7 %. The value of the enhancement factor increases with increasing air flow regime, so when the heat and mass transfer surface area increases by 50 % and the Reynolds number 200, the thermodynamic efficiency increases by 14 %, and with the Reynolds number 800 – by 28 %. The dependence of the thermodynamic efficiency of the cells at the dew point on the relative humidity of the inlet air have a maximum, which with increasing Reynolds number shifts toward larger values of relative humidity. \u0000Unlike traditional air conditioning devices, the M-cycle heat and mass exchanger does not use a steam compression cycle, so energy costs are spent only on the operation of the fan to pump air, which is a more environmentally friendly and energy efficient way of air conditioning.","PeriodicalId":334981,"journal":{"name":"Integrated Technologies and Energy Saving","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-07-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131347458","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"METHOD OF FORECASTING THE DIRECTION OF PROCESSING HYDROCARBONS","authors":"Nabil Abdel Sater, A. Grigorov","doi":"10.20998/2078-5364.2022.1.05","DOIUrl":"https://doi.org/10.20998/2078-5364.2022.1.05","url":null,"abstract":"In the article it is offered to rationalize work of installations on processing of hydrocarbonic raw materials, at the expense of its classification on types, using criterion of forecasting (KP) of the direction of processing. This approach will generally contribute to the rational use of technological equipment, reducing the metal consumption of devices and processing schemes, reducing energy costs by recovering excess heat and reducing heat exchange with the environment, efficient use of pumping equipment. At the same time, the general culture of production will increase and the harmful load on the environment will be reduced. Experimental studies have shown that the relative dielectric constant (ε), kinematic viscosity (ν20, mm2 / s) and Conradson coking (хk,%) of hydrocarbons, significantly depend on its chemical and fractional composition. In view of this, the proposed CP should be based on the above indicators. Experimental studies have allowed determining certain limit values of KP in accordance with which, hydrocarbons can be attributed to a certain type: type 0 –; type 1, 2 –; type 3 –; type 4 –. \u0000On the basis of the calculated values of KP, in the future, it is possible to develop rational schemes of technological processing of hydrocarbons, which will be related to the fuel, oil and combined direction (option). Depending on the needs of certain types of petroleum products, the target components obtained in the implementation of these schemes are hydrocarbon gases, motor and boiler fuels, lubricating oils, petroleum coke, bitumen, by-products – degradation gases, paraffin, resins and asphaltenes.","PeriodicalId":334981,"journal":{"name":"Integrated Technologies and Energy Saving","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114676874","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"IMPLEMENTATION OF INNOVATIVE TECHNOLOGICAL SOLUTIONS OF FOOD INDUSTRY FOR FOOD SUPPLY OF SMALL GROUPS IN THE LOCATION CONDITIONS OUTSIDE OF THE DISLOCATIOS","authors":"O. Savinok, Y. Dobrynin, D. Sushynskyi","doi":"10.20998/2078-5364.2022.1.09","DOIUrl":"https://doi.org/10.20998/2078-5364.2022.1.09","url":null,"abstract":"The article presents an analysis of general trends in food security for servicemen of the Armed Forces of Ukraine. Currently, the process of implementing NATO standards in the processes and procedures of logistical support of the domestic Armed Forces is underway. This applies to providing servicemen with fresh food, rich in essential substances, their maximum preservation during long-term storage and preparation before consumption. \u0000Innovative proposals of the food industry that can be implemented in the food supply of the Armed Forces of Ukraine are analyzed, recommendations are given. For cooking, it is advisable to use peeled vegetables packed in barrier films in a vacuum or with a modified gaseous environment. It is desirable to supply raw meat to consumers in the form of packaged natural semi-finished products. Peeled vegetables and meat products prepared for heat treatment will reduce the volume of refrigeration chambers for their storage, eliminate the appearance of food waste and dirty water that need to be disposed (cleaned).It is recommended to use fast-cooking cereals and cereals of high nutritional value. Such cereals will reduce the duration of the cooking process from 40–60 minutes. up to 10–15 minutes It is recommended to bake bakery products from frozen semi-finished products of a high degree of readiness. This will ensure the daily need of the staff for fresh bread, eliminate its daily supply, the threat of consumption of mold-infested products and the need for large field bakeries. \u0000It is established that the rational organization of food of small units will be provided by semi-finished products with the maximum degree of preparation for heat treatment. Semi-finished products will reduce: labor costs of the cook; time to prepare full-fledged rations; drinking water volumes; fuels and lubricants; the part of food waste.","PeriodicalId":334981,"journal":{"name":"Integrated Technologies and Energy Saving","volume":"os-21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127690834","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"DETERMINATION OF THE COEFFICIENT SLIDING FRICTION VALUE IN THE CONTACT THE CUTTING TOOL-COMPOSITE","authors":"G. Khavin, Hou Zhiwen","doi":"10.20998/2078-5364.2022.1.08","DOIUrl":"https://doi.org/10.20998/2078-5364.2022.1.08","url":null,"abstract":"One of the most important characteristics in calculating the cutting tool wear in contact with the processed composite is the friction coefficient. In most calculations, including the finite element method, the friction coefficient is traditionally set as a constant, the value of which is often taken from experience without any reason. However, when machining reinforced composites, there are too many mechanical and technological factors that have a very strong effect on the friction coefficient value. This influence is associated not only with the initial heterogeneity of the composite, but also with the constant actual change in the contact conditions over time, caused by the wear of the tool cutting part. The friction coefficient value in real conditions of contact interaction has a very complex physical content due to the presence of products of fibers and binder destruction in the contact, partial a binder melting at a temperature in contact, and the unevenness of the cut fibers presence. \u0000This article presents a formulation that allows you to calculate the value of the friction coefficient depending on the volumetric content and the inclination angle of the reinforcing elements. It is proposed to calculate the friction coefficient value as the product of two factors, one of which is responsible for the filler volumetric content, and the other for the reinforcing elements orientation. The calculations use  the mixtures theory relations .The presented expressions for calculations are based on the use of limited experimental information presented by various authors. The available data are often contradictory and relate, as a rule, to predicting the processed surface quality of unidirectional glass and carbon fiber reinforced plastics. At the same time, the friction coefficient value in the calculations has a significant impact on the representation of tool wear and life. The model does not take into account the contact pressure effect, mutual sliding velocity and temperature on the friction coefficient value, which will be the subject of further research in this direction.","PeriodicalId":334981,"journal":{"name":"Integrated Technologies and Energy Saving","volume":"489 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115404203","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}