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Search Results: 1 - 10 of 595372 matches for " L.A. Dobrzański "
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Synergic effects of the scientific cooperation in the field of materials and manufacturing engineering
L.A. Dobrzański
Journal of Achievements in Materials and Manufacturing Engineering , 2006,
Abstract: Purpose: The paper emphasises the very significant role of materials selection for design and manufacturing processes of new needed products, having the highest attainable quality and performance at the optimum and possibly the lowest cost level.Design/methodology/approach: The engineering design processes cannot be set apart either from the material design, being more and more often computer-aided, or the technological design of the most suitable manufacturing processes.Findings: The attention was paid to synergic effects of the cooperation with the specialists of various branches what was a basis of the successful series of the International Scientific Conference AMME and the foundation of the World Academy of Materials and Manufacturing Engineering.Practical implications: The paper includes also the description of the world developmental trends in that area in the first decades of the 21st century. The tasks of that field of science in priority spheres of the world development are determined.Originality/value: Directions of activities of materials science and engineering ensuring the achievements of strategic aims of the developments of societies include materials design, computational materials science, advanced analytical methods, manufacturing and processing, nano-, smart and biomimetic materials are included. It is concluded that there is a humanistic mission which stands at the engineering circle, especially associated with materials and manufacturing engineering and its aim is to make products and consumer goods, deciding directly about the level and quality of human life.
Report on the main areas of the materials science and surface engineering own research
L.A. Dobrzański
Journal of Achievements in Materials and Manufacturing Engineering , 2011,
Abstract: Purpose: The purpose of the paper is to present the representative examples for the own scientific research in the area of the forming of the structure and properties of engineering materials including biomaterials, their properties testing and microstructure characterisation and modelling, simulation and prediction of the properties and structure of these materials after selected materials processing technologies.Design/methodology/approach: The main areas of the scientific interests reported in this paper on the basis of the own original research include forming of structure and properties of engineering materials including biomaterials using advanced synthesis and materials processing technologies and nanotechnologies, engineering materials including biomaterials properties testing and microstructure characterisation using very advanced contemporary research methodologies including electron microscopy, modelling, simulation and prediction of properties and structure of engineering materials including biomaterials using advanced methods of computational materials science including artificial intelligence methods.Findings: A general character of the paper concerning many aspects of material science research enabled a detailed description of research methodology and details concerning research results. Detailed information is included in many detailed cited works.Practical implications: Presented research results can be used in practice.Originality/value: The paper presents numerous research results which Has been made during last years generalising the achievements of the research team directed by the author.
Laser powder surfacing of the Si-Mo spheroidal cast iron with nickel powder
A. Klimpel,L.A. Dobrzański
Journal of Achievements in Materials and Manufacturing Engineering , 2006,
Abstract: Purpose: Investigation results are presented of the effect of main parameters of laser powder surfacing of the Si-Mo spheroidal cast iron with the nickel based powder on quality and shape of padding welds and portion of the substrate material in the padding weld.Design/methodology/approach: It was shown basing on investigation of the process of laser powder surfacing with the nickel based powder onto the spheroidal cast iron substrate that it is feasible to make high quality padding welds in the relatively wide range of parameters.Findings: Investigation results presented in the paper were carried out to determine quality of padding welds applied by laser powder surfacing with the nickel based powder onto the alloy spheroidal cast iron and especially to determine the padding welds adhesion to the substrate.Practical implications: It is possible to control the portion of the substrate material in the padding weld with high accuracy in a wide range from even a few per cent, by the relevant setting of the line energy of the laser beam and the powder feed rate.Originality/value: The developed implant test makes the qualitative and quantitative assessment possible of the adhesion of the padding weld to the substrate, Table 5, Figs. 7 to 11. All padding welds made within the range of the optimum welding parameters demonstrated very good adhesion and the break, depending on the nickel padding weld thickness, occurred in the fusion area or by pulling part of the padding weld out.
Building methodology of virtual laboratory posts for materials science virtual laboratory purposes
L.A. Dobrzański,R. Honysz
Archives of Materials Science and Engineering , 2007,
Abstract: Purpose: The purpose of this article is to describe the building methodology of virtual laboratory posts placed in Material Science Virtual Laboratory. Presented laboratory is an open scientific, investigative, simulating and didactic medium helpful in the realization of the didactic and educational tasks from the field of material engineering in Institute of Engineering Materials and Biomaterials of the Silesian University of Technology in Gliwice, Poland.Design/methodology/approach: The use possibilities of the virtual laboratory posts are practically unrestricted. The laboratory can be a base for any studies, course or training programs performed by traditional and e-learning methods.Findings: Possession of the equipment, that is practically imperishable, cheap in exploitation and safe in usage will certainty encourage students and scientific workers to independent audits and experiments in situations, where the possibilities of their execution in the true investigative laboratory are restricted.Research limitations/implications: The student during the work with the simulations will learn the functioning principle as well as the investigations and experiments guidance methodology of the simulated real device.Practical implications: As the implementation example of the laboratory for the didactic and educational tasks the virtual simulations of investigative equipment are presented.Originality/value: The presented project corresponds with the global tendency for expand the investigative and academic centres about the possibilities of training and experiments performance with use of the virtual reality.
The significance of multimedia didactic aids in the informative society
L.A. Dobrzański,R. Honysz
Archives of Materials Science and Engineering , 2008,
Abstract: Purpose: The article describes new kind of scientific aids, created with use of computer techniques and their significance in the informative society. Student equipped in such didactic aids has the simulation possibility of phenomena and processes from the nature, the technique or from specialistic investigative laboratories.Design/methodology/approach: The teaching methodology with use of multimedia techniques makes possible the application of innovatory and effective didactic processes in several fields of education. Student will experience brand new computer culture. This will encourage them to raise their skills and abilitiesFindings: Multimedia didactic aids are used not only on the computer science lessons. They are also effective applied in many different scientific disciplines not directly connected with computer science. They raise the efficiency of applied teaching methods and they promote the realization of collectivization postulates.Research limitations/implications: In most cases authors of already published didactic aids are not professional teachers. They make accessible very large amount of data introduced in the original way, but unfortunately, burden with large number of factual errors.Originality/value: Informations contained in this article can be useful for people whose wants to create new scientific aids, with use of modern informative techniques and simultaneously, which are the valuable and important matters with high didactic value. These aids should improve all didactic subjects by learning process adjustments exact to student’s individual needs.
Mechanical properties of monolayer coatings deposited by PVD techniques
L.A. Dobrzański,K. Lukaszkowicz
Archives of Materials Science and Engineering , 2007,
Abstract: Purpose: This research was done to investigate the mechanical properties of monolayer coatings (Ti/CrN, Ti/TiAlN, Ti/ZrN, CrN, TiAl/TiAlN, Zr/ZrN, TiN) deposited by PVD technique (reactive magnetron sputtering method) onto the substrate from the CuZn40Pb2 brass. A thin metallic layer was deposited prior to deposition of ceramic monolithic coatings to improve adhesion.Design/methodology/approach: The microstructure of the coatings was cross section examined using scanning electron microscope. The residual stress was obtained from the parabolic deflection of the samples, after the coating deposition applying Stoney’s equation. The microhardness and Young’s modulus tests were made on the dynamic ultra-microhardness tester. Tests of the coatings’ adhesion to the substrate material were made using the scratch test.Findings: Obtained results show that all the coatings are in a state of compressive residual stress. The stiffness of the examined coatings is between 224-330 mN/!m, while Young’s modulus is between 258-348 GPa. Concerning the adhesion of the coatings measured by scratch test, it has been stated that the critical load LC2 for coatings, deposited onto the brass ranges from 41 to 57 N.Research limitations/implications: In order to evaluate with more detail the possibility of applying these coatings in tools, further investigations should be concentrated on the determination of the tribological properties of the coatings.Originality/value: The paper contributes to better understanding and recognition the structure of thin coatings deposited by PVD techniques. It should be stressed that the mechanical properties of the PVD coatings obtained in this work are very encouraging and therefore their application for products manufactured at mass scale is possible in all cases where reliable, very hard and abrasion resistant coatings, deposited onto brass substrate are needed.
Blended learning in teaching materials science subjects at full time studies
L.A. Dobrzański,,F. Brom
Archives of Materials Science and Engineering , 2008,
Abstract: Purpose: The main aim of this article is to present the advantages and disadvantages of the use of blendedlearning in teaching Fundamentals of Materials Science and Metal Materials. The purpose of carried research is toanalyse the effectiveness of e-learning as means of teaching in blended learning model.Design/methodology/approach: This article includes a description of blended learning; comparison ofstudents’ results in materials science between the traditional method and remote teaching using the Internet;dependencies between the effects of teaching and results of students’ tests written using the platform.Findings: Students acquire different skills and knowledge varying pace with the personal support of the teacher.This method of assisting remotely the e-learning students has proved to be efficient.Research limitations/implications: Larger population of students should be tested so as to give measurableresults, which would imply what needs to be worked on and what changes to introduce in order to improve thee-learning process.Originality/value: The document’s research material confirms that e-learning makes it possible to use a newform of education which can connect the advantages of traditional learning and remote education in the field ofmaterials science.
Artificial intelligence and virtual environment application for materials design methodology
L.A. Dobrzański,R. Honysz
Archives of Materials Science and Engineering , 2010,
Abstract: Purpose: The purpose of this study is to develop a methodology for material design, enabling the selection of the chemical elements concentration, heat and plastic treatment conditions and geometrical dimensions to ensure the required mechanical properties of structural steels specified by the designer of machinery and equipment as the basis for the design of material components manufactured from these steels, by using a computational model developed with use of artificial intelligence methods and virtual environment. The model is designed to provide impact examinations of these factors on the mechanical properties of steel only in the computing environment.Design/methodology/approach: A virtual research environment built with use of computational model describing relationships between chemical composition, heat and plastic treatment conditions and product geometric dimensions and mechanical properties of the examined group of steel was developed and practical applied. This model enables the design of new structural steel by setting the values of mechanical properties based on material production descriptors and allows the selection of production descriptors on the basis of the mechanical properties without the need for additional tests or experimental studies in reality.Findings: Virtual computing environment allows full usage of the developed intelligent model of non-alloy and alloy structural steel properties and provides an easy, intuitive and user-friendly way to designate manufacturing descriptors and mechanical properties for products.Research limitations/implications:The proposed solutions allow the usage of developed virtual environment as a new medium in both, the scientific work performed remotely, as well as in education during classes.Practical implications: The new material design methodology has practical application in the development of materials and modelling of steel descriptors in aim to improve the mechanical properties and specific applications in the production of steel. Presented examples of computer aid in structural steel production showing a potential application possibility of this methodology to support the production of any group of engineering materials.Originality/value: The prediction possibility of the material mechanical properties is valuable for manufacturers and constructors. It ensures the customers quality requirements and brings also measurable financial advantages.
Informative technologies in the material products designing
L.A. Dobrzański,R. Honysz
Archives of Materials Science and Engineering , 2012,
Abstract: Purpose: The purpose of materials products designing is to optimize their functional properties in terms of technological, economic and ecological aspects.Design/methodology/approach: Materials science is an example of a field, in which informative technologies used to understand and anticipate the construction of materials and their properties has a significant success.Findings: Innovation and development of new informative technologies and the widespread use of modern materials will be essential for promoting economic development in the near future by application of entirely new, interdisciplinary field of science: computational materials science.Practical implications: The use of informative technologies allows exploring in a short time and at low expense, many solutions for the design of the mechanical properties of materials and their simulation beyond the standardized range.Originality/value: The most important benefit of material designing is the ability of suitable selection of material (or its manufacturing) for various applications with use of informative technologies.
Heat treatment influence on mechanical properties of structural steels for quenching and tempering
L.A. Dobrzański,R. Honysz
Journal of Achievements in Materials and Manufacturing Engineering , 2012,
Abstract: Purpose: This paper introduces analysis results of heat treatment conditions in uence on mechanical properties of alloy structural steels for quenching and tempering.Design/methodology/approach: Investigations were performed in virtual environment with use of materials science virtual laboratory. Virtual investigations results were veri ed in real investigative laboratory.Findings: Performed veri cation investigations presented in this paper on selected mechanical properties modelling examples of structural steels clearly show the correctness of the developed computational model of structural steel and con rm the possibility of its use in the industrial production, both to predict the properties, as well as to design new types of steel.Practical implications: Results of virtual examinations can be presented as raw data or in uence chartsOriginality/value: The effectiveness of the virtual environment application for the prediction, simulation and modelling of the steel properties is presented
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