The experimental stand created is made for charging, testing and monitoring the processes that take place at a drone, in a static and also dynamic manner. On this platform we have developed, created and tested various kinds of sensors, and charging methods, rechargeable batteries, multicopper drones, automatically without disconnecting or disassembling them from the drones they serve. Also, at this level we fitted a flat zone, that is polarized where the drone will land, in a controlled manner and after a preliminary testing of polarity and of tension level, the charging will begin, as its parameters will carefully monitored.
{"title":"Experimental System for Charging and Testing Batteries Specific to Multirotor Drones","authors":"V. Pleşca, S. Paturca","doi":"10.35219/mms.2020.4.01","DOIUrl":"https://doi.org/10.35219/mms.2020.4.01","url":null,"abstract":"The experimental stand created is made for charging, testing and monitoring the processes that take place at a drone, in a static and also dynamic manner. On this platform we have developed, created and tested various kinds of sensors, and charging methods, rechargeable batteries, multicopper drones, automatically without disconnecting or disassembling them from the drones they serve. Also, at this level we fitted a flat zone, that is polarized where the drone will land, in a controlled manner and after a preliminary testing of polarity and of tension level, the charging will begin, as its parameters will carefully monitored.","PeriodicalId":22358,"journal":{"name":"The Annals of “Dunarea de Jos” University of Galati. Fascicle IX, Metallurgy and Materials Science","volume":"573 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77317840","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}
Used mainly in the construction of automobiles as a substitute for steel, or in the metallurgical industry, mainly in the manufacture of rolling mill cylinders, the mechanical properties of nodular cast iron depend largely on their structure, consisting of a ferritic metal mass, ferrite - pearlitic mass or pearlitic and graphite formations (graphite nodules) of maximum compactness. The modification of the structure in the desired direction of use properties, possible by applying appropriate heat treatments, can be achieved in conditions of technical and economic efficiency by applying the optimal heat treatment variant, in which the technological parameters temperature - time have a decisive influence. The paper summarizes some research results that aimed to establish the influence of annealing temperature and maintenance time to determine the optimal variant of graphite annealing heat treatment. Process modeling by statistical methods, indicated in the analysis of complex technological processes, has allowed, based on a preliminary experiment and then on the factorial experiment, the establishing of the degree of connection between the technological parameters of the process, as well as the technological parameter with the greatest influence on the process.
{"title":"Mathematical Modeling of the Graphitization Process Applied to Nodular Cast Iron Parts","authors":"E. Vasilescu, M. Neacsu","doi":"10.35219/mms.2020.4.03","DOIUrl":"https://doi.org/10.35219/mms.2020.4.03","url":null,"abstract":"Used mainly in the construction of automobiles as a substitute for steel, or in the metallurgical industry, mainly in the manufacture of rolling mill cylinders, the mechanical properties of nodular cast iron depend largely on their structure, consisting of a ferritic metal mass, ferrite - pearlitic mass or pearlitic and graphite formations (graphite nodules) of maximum compactness. The modification of the structure in the desired direction of use properties, possible by applying appropriate heat treatments, can be achieved in conditions of technical and economic efficiency by applying the optimal heat treatment variant, in which the technological parameters temperature - time have a decisive influence. The paper summarizes some research results that aimed to establish the influence of annealing temperature and maintenance time to determine the optimal variant of graphite annealing heat treatment. Process modeling by statistical methods, indicated in the analysis of complex technological processes, has allowed, based on a preliminary experiment and then on the factorial experiment, the establishing of the degree of connection between the technological parameters of the process, as well as the technological parameter with the greatest influence on the process.","PeriodicalId":22358,"journal":{"name":"The Annals of “Dunarea de Jos” University of Galati. Fascicle IX, Metallurgy and Materials Science","volume":"11 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78351664","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}
In this work, Molecular dynamics simulation was performed to study the cascade damage evaluation initial from a 250 eV Primary Knock-on Atoms (PKAs) in gold. For this purpose, the simulations were carried out using the molecular dynamics code GRAPE to study the cooling phase of a cascade from the thermodynamic point view. Interatomic interaction of the cascade was investigated by the Morse potential and it is found that during the cooling phase of the cascade local equilibrium was realized.
{"title":"A molecular dynamics calculation to cascade damage processes","authors":"H. Qadr","doi":"10.35219/mms.2020.4.02","DOIUrl":"https://doi.org/10.35219/mms.2020.4.02","url":null,"abstract":"In this work, Molecular dynamics simulation was performed to study the cascade damage evaluation initial from a 250 eV Primary Knock-on Atoms (PKAs) in gold. For this purpose, the simulations were carried out using the molecular dynamics code GRAPE to study the cooling phase of a cascade from the thermodynamic point view. Interatomic interaction of the cascade was investigated by the Morse potential and it is found that during the cooling phase of the cascade local equilibrium was realized.","PeriodicalId":22358,"journal":{"name":"The Annals of “Dunarea de Jos” University of Galati. Fascicle IX, Metallurgy and Materials Science","volume":"32 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77737241","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}
The study aims to investigate the effect of fluorinated toothpaste added in Fusayama-Meyer saliva in order to evaluate the electrochemical behavior of 316LSS for dentistry applications. For electrochemical behavior in situ electrochemical measurements such as: Open circuit potential (OCP), Linear Polarization (PL), Potentiodynamic Polarization (PD) and Electrochemical Impedance Spectroscopy (EIS) were applied. The results show a comparative analysis of the electrochemical behavior and corrosion resistance of 316L-SS in human saliva containing high fluoride toothpaste for dentistry applications. From the electrochemical results it can be concluded that the addition of fluoride toothpaste in Fusayama-Meyer saliva decreases the corrosion resistance of 316L-SS and therefore will reduce the lifetime of dentistry structures or devices.
{"title":"The Effect of Fluoride Containing Toothpaste on the Electrochemical Behavior of 316L Stainless Steel for Dentistry Applications in the Human Saliva","authors":"V. Neaga, L. Benea","doi":"10.35219/mms.2020.4.07","DOIUrl":"https://doi.org/10.35219/mms.2020.4.07","url":null,"abstract":"The study aims to investigate the effect of fluorinated toothpaste added in Fusayama-Meyer saliva in order to evaluate the electrochemical behavior of 316LSS for dentistry applications. For electrochemical behavior in situ electrochemical measurements such as: Open circuit potential (OCP), Linear Polarization (PL), Potentiodynamic Polarization (PD) and Electrochemical Impedance Spectroscopy (EIS) were applied. The results show a comparative analysis of the electrochemical behavior and corrosion resistance of 316L-SS in human saliva containing high fluoride toothpaste for dentistry applications. From the electrochemical results it can be concluded that the addition of fluoride toothpaste in Fusayama-Meyer saliva decreases the corrosion resistance of 316L-SS and therefore will reduce the lifetime of dentistry structures or devices.","PeriodicalId":22358,"journal":{"name":"The Annals of “Dunarea de Jos” University of Galati. Fascicle IX, Metallurgy and Materials Science","volume":"56 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77780193","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}
The research aimed to obtain phosphate porcelain, by using the ash resulting from burning bones from meat processing plants. The applied processing technology allows obtaining fine ceramics at lower temperatures than the one used in the case of feldspar porcelain, having as effect the increase of the durability of the firing furnaces and the realization of the products at lower production costs. Five series of phosphate porcelain samples were performed in laboratory conditions, with different compositions, by firing at a temperature of 1250 ℃, temperatures lower than those necessary for the firing of feldspar porcelain of 1350-1450 ℃. The porosity and density of the samples were determined and the microstructural analysis of the materials made in the five research variants was made.
{"title":"Obtaining and Characterizing Phosphatic Porcelain","authors":"F. Potecașu, P. Alexandru","doi":"10.35219/mms.2020.4.06","DOIUrl":"https://doi.org/10.35219/mms.2020.4.06","url":null,"abstract":"The research aimed to obtain phosphate porcelain, by using the ash resulting from burning bones from meat processing plants. The applied processing technology allows obtaining fine ceramics at lower temperatures than the one used in the case of feldspar porcelain, having as effect the increase of the durability of the firing furnaces and the realization of the products at lower production costs. Five series of phosphate porcelain samples were performed in laboratory conditions, with different compositions, by firing at a temperature of 1250 ℃, temperatures lower than those necessary for the firing of feldspar porcelain of 1350-1450 ℃. The porosity and density of the samples were determined and the microstructural analysis of the materials made in the five research variants was made.","PeriodicalId":22358,"journal":{"name":"The Annals of “Dunarea de Jos” University of Galati. Fascicle IX, Metallurgy and Materials Science","volume":"230 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80250241","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}
The purpose of the present work is to present new manufacturing technologies process of bed frame elements, especially those with a circular or conical section, made of high strength materials, new on the market. The research based on three methods to make this bed frame elements: cold deformation method, hot deformation method and cold deformation method after soft annealing. Experimental research is focused on how the steel behaves at high temperatures, in identifying an adequate improvement treatment for parts after soft annealing, to increase the mechanical properties of this and preparation of the welding procedure specification.
{"title":"Bed Frame Fabrication for Heavy Duty Machine Tools or Unique of High Strenght Materials Quend 700","authors":"C. Rusan, C. Ciupan","doi":"10.35219/mms.2020.3.05","DOIUrl":"https://doi.org/10.35219/mms.2020.3.05","url":null,"abstract":"The purpose of the present work is to present new manufacturing technologies process of bed frame elements, especially those with a circular or conical section, made of high strength materials, new on the market. The research based on three methods to make this bed frame elements: cold deformation method, hot deformation method and cold deformation method after soft annealing. Experimental research is focused on how the steel behaves at high temperatures, in identifying an adequate improvement treatment for parts after soft annealing, to increase the mechanical properties of this and preparation of the welding procedure specification.","PeriodicalId":22358,"journal":{"name":"The Annals of “Dunarea de Jos” University of Galati. Fascicle IX, Metallurgy and Materials Science","volume":"55 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84872863","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}
The experimental research carried out and described in this paper aimed to obtain thin films from copper oxides and their characterization from the structural point of view and the optical and electrical properties. To obtain the copper films, a PVD spray deposition system was used, consisting of a vacuum chamber with a capacity of 2 liters, a planar magnetron with ferrite magnets (40x22x9) neodymium (15x8), a vacuum pump with sliding blades, a variable source of direct current of voltage 100 - 600 volts. The atmosphere used for plasma maintenance during deposition was argon rarefied in a pressure range between 3·10-2 - 8·10-3 mbar. The deposits were made on glass plates. The films thus obtained were subsequently subjected to oxidation at temperatures of 200, 300 and 450 °C. It was found that the transparency of the films increases with the oxidation temperature from 1.464 * 10-4 for 200 ºC to 0.5 for 450 ºC and the surface electrical resistance also increases from 0.984 Ώ for 200 ºC to 3882857,1428 Ώ for 450 ºC. With increasing spray power, transparency and surface strength decrease.
{"title":"CuO Films Obtained by Oxidation of Cu Layers Deposited by the PVD Process - Magnetron Sputtering","authors":"S. Boiciuc, Dunărea de Jos","doi":"10.35219/mms.2020.3.03","DOIUrl":"https://doi.org/10.35219/mms.2020.3.03","url":null,"abstract":"The experimental research carried out and described in this paper aimed to obtain thin films from copper oxides and their characterization from the structural point of view and the optical and electrical properties. To obtain the copper films, a PVD spray deposition system was used, consisting of a vacuum chamber with a capacity of 2 liters, a planar magnetron with ferrite magnets (40x22x9) neodymium (15x8), a vacuum pump with sliding blades, a variable source of direct current of voltage 100 - 600 volts. The atmosphere used for plasma maintenance during deposition was argon rarefied in a pressure range between 3·10-2 - 8·10-3 mbar. The deposits were made on glass plates. The films thus obtained were subsequently subjected to oxidation at temperatures of 200, 300 and 450 °C. It was found that the transparency of the films increases with the oxidation temperature from 1.464 * 10-4 for 200 ºC to 0.5 for 450 ºC and the surface electrical resistance also increases from 0.984 Ώ for 200 ºC to 3882857,1428 Ώ for 450 ºC. With increasing spray power, transparency and surface strength decrease.","PeriodicalId":22358,"journal":{"name":"The Annals of “Dunarea de Jos” University of Galati. Fascicle IX, Metallurgy and Materials Science","volume":"60 4 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90118528","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}
The paper presents an analysis, regarding the control of the possible dangerous leaks of carbon monoxide, in this type of spaces, destined for the casting of the metal parts. These carbon monoxide leaks can occur mainly in the metal alloy making sector, which is to be cast into parts. The direct measurements were made especially in this working point, within the technological process, in different phases of the alloys elaboration process, but also during the time, when the workshop, was without production activity. The measurements were made with the help of the Fluke 975 Anemometer device, the results obtained being compared with the legislation in force, regarding safety and health at work.
{"title":"Studies and Research on the Control of the Residual Gas Leaks in a Casting Metal Parts Workshop","authors":"Mircea Dragan, B. Tudor, Dunărea de Jos","doi":"10.35219/mms.2020.2.02","DOIUrl":"https://doi.org/10.35219/mms.2020.2.02","url":null,"abstract":"The paper presents an analysis, regarding the control of the possible dangerous leaks of carbon monoxide, in this type of spaces, destined for the casting of the metal parts. These carbon monoxide leaks can occur mainly in the metal alloy making sector, which is to be cast into parts. The direct measurements were made especially in this working point, within the technological process, in different phases of the alloys elaboration process, but also during the time, when the workshop, was without production activity. The measurements were made with the help of the Fluke 975 Anemometer device, the results obtained being compared with the legislation in force, regarding safety and health at work.","PeriodicalId":22358,"journal":{"name":"The Annals of “Dunarea de Jos” University of Galati. Fascicle IX, Metallurgy and Materials Science","volume":"283 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77501825","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}
Experimental research has focused on the corrosion behaviour of a widely used protective coating, respectively, galvanized sheet in various corrosive aqueous environments present in nature. In the laboratory experiments, the following were chosen as corrosive media: rainwater, domestic water, Danube water and sea water.Galvanized sheet can interact with these environments due to its use in metal constructions, home appliances, car construction, food industry, others.In order to assess the corrosion resistance, the mass loss was determined for a period of five weeks. The results showed a higher corrosion rate in rainwater compared to the other corrosive environments tested. The lowest corrosion rate was in sea water. In domestic water and Danube water the mass loss was comparable.
{"title":"Corrosion of Galvanized Steel in Various Aqueous Environments Present in Nature","authors":"T. Radu, Dunărea de Jos","doi":"10.35219/mms.2020.2.06","DOIUrl":"https://doi.org/10.35219/mms.2020.2.06","url":null,"abstract":"Experimental research has focused on the corrosion behaviour of a widely used protective coating, respectively, galvanized sheet in various corrosive aqueous environments present in nature. In the laboratory experiments, the following were chosen as corrosive media: rainwater, domestic water, Danube water and sea water.Galvanized sheet can interact with these environments due to its use in metal constructions, home appliances, car construction, food industry, others.In order to assess the corrosion resistance, the mass loss was determined for a period of five weeks. The results showed a higher corrosion rate in rainwater compared to the other corrosive environments tested. The lowest corrosion rate was in sea water. In domestic water and Danube water the mass loss was comparable.","PeriodicalId":22358,"journal":{"name":"The Annals of “Dunarea de Jos” University of Galati. Fascicle IX, Metallurgy and Materials Science","volume":"55 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84829552","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}
The normalizing of ferritic-pearlitic steels is a heat treatment, which consist of reheating into the austenite and subsequent air-cooling. For greater thickness, e.g. 100 mm, variations in the requirements may be permitted or required for particular applications but a reduction of the required impact energy is not allowed. The most important cote of the cost can be eliminated if the process normalizing rolling is applied.
{"title":"Experiments Regarding the Fabrication of the Higher Strength Steels Plates","authors":"M. Bordei, B. Carp","doi":"10.35219/mms.2020.2.04","DOIUrl":"https://doi.org/10.35219/mms.2020.2.04","url":null,"abstract":"The normalizing of ferritic-pearlitic steels is a heat treatment, which consist of reheating into the austenite and subsequent air-cooling. For greater thickness, e.g. 100 mm, variations in the requirements may be permitted or required for particular applications but a reduction of the required impact energy is not allowed. The most important cote of the cost can be eliminated if the process normalizing rolling is applied.","PeriodicalId":22358,"journal":{"name":"The Annals of “Dunarea de Jos” University of Galati. Fascicle IX, Metallurgy and Materials Science","volume":"13 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80187300","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}
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