Przemysław Nosal | AGH University of Science and Technology (original) (raw)

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Papers by Przemysław Nosal

Research paper thumbnail of Modeling solid materials in DEM using the micropolar theory

Zenodo (CERN European Organization for Nuclear Research), Apr 12, 2023

The discrete element method (DEM) is a widely accepted method used in simulations of the powder s... more The discrete element method (DEM) is a widely accepted method used in simulations of the powder sintering process, where the real object is replaced by a set of particles representing elastic-plastic material. Recently, this method has also been used to model solid materials. In this work, we present a local constitutive model for the determination of the interaction forces, which is based on micropolar theory. The model shows an elastoviscoplastic behavior, thus an adaptation of the Johnson-Cook description of flow stress, which allows the analysis of solid materials subjected to high strain rates. The results of the DEM simulations received after calibration of the model parameters agree well with the experimental data from literature.

Research paper thumbnail of Modeling Solid Materials in DEM Using the Micropolar Theory

Research paper thumbnail of Modelling of the temperature field that accompanies friction stir welding

ITM Web of Conferences

The thermal modelling of the Friction Stir Welding process allows for better recognition and unde... more The thermal modelling of the Friction Stir Welding process allows for better recognition and understanding of phenomena occurring during the joining process of different materials. It is of particular importance considering the possibilities of process technology parameters, optimization and the mechanical properties of the joint. This work demonstrates the numerical modelling of temperature distribution accompanying the process of friction stir welding. The axisymmetric problem described by Fourier's type equation with internal heat source is considered. In order to solve the diffusive initial value problem a fully implicit scheme of the finite difference method is applied. The example under consideration deals with the friction stir welding of a plate (0.7 cm thick) made of Al 6082-T6 by use of a tool made of tungsten alloy, whereas the material subjected to welding was TiC powder. Obtained results confirm both quantitatively and qualitatively experimental observations that the superior temperature corresponds to the zone where the pin joints the shoulder.

Research paper thumbnail of Numerical Simulation of Temperature Distribution during the First Stage of the Friction Stir Alloying Process

Technical Transactions, 2018

This work demonstrates the numerical modelling of thermal dispersion accompanying the first stage... more This work demonstrates the numerical modelling of thermal dispersion accompanying the first stage of the friction stir alloying process. It is very important to recognise the temperature field in the modified workpiece in order to identify the zones where the physical material properties are changing. The temperature gradient leads to a drop of yield strength of the material and, as a consequence, the occurrence of the possibility of plastic flow around the tool. An attempt has been made to analyse the axisymmetric thermal problem described by a Fourier equation with an internal heat source in which the heat is derived only from work of frictional forces occurring between the workpiece and the tool material. The example under consideration focuses on the production of an Al-TiC composite using FSA technology. Macrostructure images of the composite and the simulation results confirm the correctness of the applied mathematical model, where the obtained temperature field corresponds wi...

Research paper thumbnail of Concept of Flocks Fragmentation and Averaging Method for the Application of Electrocoagulation in Process for Coke Oven Wastewater Treatment

Materials

The main objective of the article is to develop the concept of flock fragmentation and the averag... more The main objective of the article is to develop the concept of flock fragmentation and the averaging method for the application of electrocoagulation in the process of treating wastewater from coke ovens. The designed solution was part of an innovative system for the coke oven wastewater treatment process. The system is dedicated to removing the hazardous elements and compounds from wastewater from leaching ashes in municipal waste incineration plants. The design of the process and its automatization was based on a quantitative simulation method. The balance equations of mass, energy, and momentum of transport, complemented by the kinetics of the related reaction, are used during the calculation of the process. The main result achieved is a practical solution—the reactor’s scheme, classified due to a patent procedure in the Polish Patent Office.

Research paper thumbnail of Concept of Flocks Fragmentation and Averaging Method for the Application of Electrocoagulation in Process for Coke Oven Wastewater Treatment

The main objective of the article is to develop the concept of flock fragmentation and the averag... more The main objective of the article is to develop the concept of flock fragmentation and the averaging method for the application of electrocoagulation in the process of treating wastewater from coke ovens. The designed solution was part of an innovative system for the coke oven wastewater treatment process. The system is dedicated to removing the hazardous elements and compounds from wastewater from leaching ashes in municipal waste incineration plants. The design of the process and its automatization was based on a quantitative simulation method. The balance equations of mass, energy, and momentum of transport, complemented by the kinetics of the related reaction, are used during the calculation of the process. The main result achieved is a practical solution—the reactor’s scheme, classified due to a patent procedure in the Polish Patent Office.

Research paper thumbnail of Effect of FSW Process Parameters on Properties of Aluminium Joints

Biuletyn Instytutu Spawalnictwa, 2017

Ever since its development in the 1990s, the friction stir welding method (FSW) has been increasi... more Ever since its development in the 1990s, the friction stir welding method (FSW) has been increasingly popular in various industrial sectors, e.g. in transport, power engineering or electronic industry. In spite of its numerous advantages in comparison with conventional joining methods, the FSW method continues to be intensively investigates to develop appropriate technological parameters and geometry of tools ensuring the obtainment of joints characterised by excellent properties. The process of optimisation is required for each new material. The adjustment of proper FSW process parameters, particularly the tool rate of rotation and the travel rate, enables the obtainment of imperfection-free joints as well as significantly affects process efficiency decreasing its laboriousness and costs. The article addresses issues connected with the optimisation of the FSW process by analysing the effects of changes in the tool travel rate and the rate of rotation on structural and mechanical properties of aluminium joints. The tests involved the use of aluminium alloy grade 6063. The test joints were subjected to visual tests, hardness tests, microstructural examination, static tensile tests etc.

Research paper thumbnail of A novel hybrid composites based on biopolyamide 10.10 with basalt/aramid fibers: Mechanical and thermal investigation

Composites Part B: Engineering

Research paper thumbnail of Biobased Polyethylene Hybrid Composites with Natural Fiber: Mechanical, Thermal Properties, and Micromechanics

Materials

The work assumed the possibility of the introduction natural fibers as a hybrid reinforcement of ... more The work assumed the possibility of the introduction natural fibers as a hybrid reinforcement of bio-polyethylene composites. Coconut fibers, basalt fibers and wood flour were used in different combination as a hybrid merger. Mechanical tests were conducted. An increase in the mechanical properties was shown as an effect of the introduction of the fibers info the polymeric matrix. A synergic influence of hybrid reinforcement was also presented. Experimental results were compared with modeling parameters. The hydrothermal and accelerated thermal ageing effects on the mechanical behavior of composites were presented. Scanning electron microscope images were observed in order to analyze structure of examined composites.

Research paper thumbnail of Effect of FSW Traverse Speed on Mechanical Properties of Copper Plate Joints

Materials

The paper describes the influence of the friction stir welding travel speed on the mechanical pro... more The paper describes the influence of the friction stir welding travel speed on the mechanical properties of the butt joints of copper plates. The results of static and fatigue tests of the base material (Cu-ETP R220) and welded specimens produced at various travel speeds were compared, considering a loading applied both parallel and perpendicularly to the rolling direction of the plates. The mechanical properties of the FSW joints were evaluated with respect to parameters of plates’ material in the delivery state and after recrystallisation annealing. The strength parameters of friction stir welding joints were compared with the data on tungsten inert gas welded joints of copper plates available in the literature. The results of microhardness tests and fractographic analysis of tested joints are also presented. Based on the above test results, it was shown that although in the whole range of considered traverse speeds (from 40 to 80 mm/min), comparable properties were obtained for F...

Research paper thumbnail of Modelling of the temperature field that accompanies friction stir welding

The thermal modelling of the Friction Stir Welding process allows for better recognition and unde... more The thermal modelling of the Friction Stir Welding process allows for better recognition and understanding of phenomena occurring during the joining process of different materials. It is of particular importance considering the possibilities of process technology parameters, optimization and the mechanical properties of the joint. This work demonstrates the numerical modelling of temperature distribution accompanying the process of friction stir welding. The axisymmetric problem described by Fourier’s type equation with internal heat source is considered. In order to solve the diffusive initial value problem a fully implicit scheme of the finite difference method is applied. The example under consideration deals with the friction stir welding of a plate (0.7 cm thick) made of Al 6082-T6 by use of a tool made of tungsten alloy, whereas the material subjected to welding was TiC powder. Obtained results confirm both quantitatively and qualitatively experimental observations that the superior temperature corresponds to the zone where the pin joints the shoulder.

Research paper thumbnail of Wpływ parametrów procesu FSW na właściwości aluminiowych złączy

Odkąd pod koniec XX wieku opracowano metodę zgrzewania tarciowego z mieszaniem materiału zgrzeiny... more Odkąd pod koniec XX wieku opracowano metodę zgrzewania tarciowego z mieszaniem materiału zgrzeiny (z ang. Friction Stir Welding, FSW), znajduje ona coraz szersze zastosowanie w różnych gałęziach przemysłu, m.in. w przemyśle transportowym, energetycznym czy też elektronicznym. Mimo licznych zalet procesu FSW, w porównaniu do konwencjonalnych metod spajania, ciągle prowadzone są intensywne badania mające na celu opracowanie odpowiedniego doboru parametrów technologicznych oraz geometrii stosowanych narzędzi, tak aby uzyskiwać złącza o jak najlepszych właściwościach. Przeprowadzenie procesu optymalizacji wymagane jest każdorazowo dla nowo zgrzewanego materiału. Dostosowanie właściwych parametrów procesu FSW, w których kluczową rolę odgrywają prędkość obrotowa oraz prędkość posuwu narzędzia, umożliwia nie tylko wykonanie złączy wolnych od wad, ale również w sposób istotny wpływa na efektywność procesu, przez co możliwe jest zmniejszenie pracochłonności i kosztów wytwarzania. Artykuł porusza zagadnienia związane z optymalizacją parametrów procesu zgrzewania tarciowego z mieszaniem materiału zgrzeiny. Analizowano wpływ zmiany prędkości posuwu oraz prędkości obrotowej narzędzia na właściwości strukturalne i wytrzymałościowe złączy aluminiowych. Badania przeprowadzono dla stopu gatunku 6063. Wykonane złącza poddano mi.in. badaniom wizualnym, pomiarom twardości, obserwacjom mikrostrukturalnym oraz statycznej próbie wytrzymałości na rozciąganie.

Research paper thumbnail of Modeling solid materials in DEM using the micropolar theory

Zenodo (CERN European Organization for Nuclear Research), Apr 12, 2023

The discrete element method (DEM) is a widely accepted method used in simulations of the powder s... more The discrete element method (DEM) is a widely accepted method used in simulations of the powder sintering process, where the real object is replaced by a set of particles representing elastic-plastic material. Recently, this method has also been used to model solid materials. In this work, we present a local constitutive model for the determination of the interaction forces, which is based on micropolar theory. The model shows an elastoviscoplastic behavior, thus an adaptation of the Johnson-Cook description of flow stress, which allows the analysis of solid materials subjected to high strain rates. The results of the DEM simulations received after calibration of the model parameters agree well with the experimental data from literature.

Research paper thumbnail of Modeling Solid Materials in DEM Using the Micropolar Theory

Research paper thumbnail of Modelling of the temperature field that accompanies friction stir welding

ITM Web of Conferences

The thermal modelling of the Friction Stir Welding process allows for better recognition and unde... more The thermal modelling of the Friction Stir Welding process allows for better recognition and understanding of phenomena occurring during the joining process of different materials. It is of particular importance considering the possibilities of process technology parameters, optimization and the mechanical properties of the joint. This work demonstrates the numerical modelling of temperature distribution accompanying the process of friction stir welding. The axisymmetric problem described by Fourier's type equation with internal heat source is considered. In order to solve the diffusive initial value problem a fully implicit scheme of the finite difference method is applied. The example under consideration deals with the friction stir welding of a plate (0.7 cm thick) made of Al 6082-T6 by use of a tool made of tungsten alloy, whereas the material subjected to welding was TiC powder. Obtained results confirm both quantitatively and qualitatively experimental observations that the superior temperature corresponds to the zone where the pin joints the shoulder.

Research paper thumbnail of Numerical Simulation of Temperature Distribution during the First Stage of the Friction Stir Alloying Process

Technical Transactions, 2018

This work demonstrates the numerical modelling of thermal dispersion accompanying the first stage... more This work demonstrates the numerical modelling of thermal dispersion accompanying the first stage of the friction stir alloying process. It is very important to recognise the temperature field in the modified workpiece in order to identify the zones where the physical material properties are changing. The temperature gradient leads to a drop of yield strength of the material and, as a consequence, the occurrence of the possibility of plastic flow around the tool. An attempt has been made to analyse the axisymmetric thermal problem described by a Fourier equation with an internal heat source in which the heat is derived only from work of frictional forces occurring between the workpiece and the tool material. The example under consideration focuses on the production of an Al-TiC composite using FSA technology. Macrostructure images of the composite and the simulation results confirm the correctness of the applied mathematical model, where the obtained temperature field corresponds wi...

Research paper thumbnail of Concept of Flocks Fragmentation and Averaging Method for the Application of Electrocoagulation in Process for Coke Oven Wastewater Treatment

Materials

The main objective of the article is to develop the concept of flock fragmentation and the averag... more The main objective of the article is to develop the concept of flock fragmentation and the averaging method for the application of electrocoagulation in the process of treating wastewater from coke ovens. The designed solution was part of an innovative system for the coke oven wastewater treatment process. The system is dedicated to removing the hazardous elements and compounds from wastewater from leaching ashes in municipal waste incineration plants. The design of the process and its automatization was based on a quantitative simulation method. The balance equations of mass, energy, and momentum of transport, complemented by the kinetics of the related reaction, are used during the calculation of the process. The main result achieved is a practical solution—the reactor’s scheme, classified due to a patent procedure in the Polish Patent Office.

Research paper thumbnail of Concept of Flocks Fragmentation and Averaging Method for the Application of Electrocoagulation in Process for Coke Oven Wastewater Treatment

The main objective of the article is to develop the concept of flock fragmentation and the averag... more The main objective of the article is to develop the concept of flock fragmentation and the averaging method for the application of electrocoagulation in the process of treating wastewater from coke ovens. The designed solution was part of an innovative system for the coke oven wastewater treatment process. The system is dedicated to removing the hazardous elements and compounds from wastewater from leaching ashes in municipal waste incineration plants. The design of the process and its automatization was based on a quantitative simulation method. The balance equations of mass, energy, and momentum of transport, complemented by the kinetics of the related reaction, are used during the calculation of the process. The main result achieved is a practical solution—the reactor’s scheme, classified due to a patent procedure in the Polish Patent Office.

Research paper thumbnail of Effect of FSW Process Parameters on Properties of Aluminium Joints

Biuletyn Instytutu Spawalnictwa, 2017

Ever since its development in the 1990s, the friction stir welding method (FSW) has been increasi... more Ever since its development in the 1990s, the friction stir welding method (FSW) has been increasingly popular in various industrial sectors, e.g. in transport, power engineering or electronic industry. In spite of its numerous advantages in comparison with conventional joining methods, the FSW method continues to be intensively investigates to develop appropriate technological parameters and geometry of tools ensuring the obtainment of joints characterised by excellent properties. The process of optimisation is required for each new material. The adjustment of proper FSW process parameters, particularly the tool rate of rotation and the travel rate, enables the obtainment of imperfection-free joints as well as significantly affects process efficiency decreasing its laboriousness and costs. The article addresses issues connected with the optimisation of the FSW process by analysing the effects of changes in the tool travel rate and the rate of rotation on structural and mechanical properties of aluminium joints. The tests involved the use of aluminium alloy grade 6063. The test joints were subjected to visual tests, hardness tests, microstructural examination, static tensile tests etc.

Research paper thumbnail of A novel hybrid composites based on biopolyamide 10.10 with basalt/aramid fibers: Mechanical and thermal investigation

Composites Part B: Engineering

Research paper thumbnail of Biobased Polyethylene Hybrid Composites with Natural Fiber: Mechanical, Thermal Properties, and Micromechanics

Materials

The work assumed the possibility of the introduction natural fibers as a hybrid reinforcement of ... more The work assumed the possibility of the introduction natural fibers as a hybrid reinforcement of bio-polyethylene composites. Coconut fibers, basalt fibers and wood flour were used in different combination as a hybrid merger. Mechanical tests were conducted. An increase in the mechanical properties was shown as an effect of the introduction of the fibers info the polymeric matrix. A synergic influence of hybrid reinforcement was also presented. Experimental results were compared with modeling parameters. The hydrothermal and accelerated thermal ageing effects on the mechanical behavior of composites were presented. Scanning electron microscope images were observed in order to analyze structure of examined composites.

Research paper thumbnail of Effect of FSW Traverse Speed on Mechanical Properties of Copper Plate Joints

Materials

The paper describes the influence of the friction stir welding travel speed on the mechanical pro... more The paper describes the influence of the friction stir welding travel speed on the mechanical properties of the butt joints of copper plates. The results of static and fatigue tests of the base material (Cu-ETP R220) and welded specimens produced at various travel speeds were compared, considering a loading applied both parallel and perpendicularly to the rolling direction of the plates. The mechanical properties of the FSW joints were evaluated with respect to parameters of plates’ material in the delivery state and after recrystallisation annealing. The strength parameters of friction stir welding joints were compared with the data on tungsten inert gas welded joints of copper plates available in the literature. The results of microhardness tests and fractographic analysis of tested joints are also presented. Based on the above test results, it was shown that although in the whole range of considered traverse speeds (from 40 to 80 mm/min), comparable properties were obtained for F...

Research paper thumbnail of Modelling of the temperature field that accompanies friction stir welding

The thermal modelling of the Friction Stir Welding process allows for better recognition and unde... more The thermal modelling of the Friction Stir Welding process allows for better recognition and understanding of phenomena occurring during the joining process of different materials. It is of particular importance considering the possibilities of process technology parameters, optimization and the mechanical properties of the joint. This work demonstrates the numerical modelling of temperature distribution accompanying the process of friction stir welding. The axisymmetric problem described by Fourier’s type equation with internal heat source is considered. In order to solve the diffusive initial value problem a fully implicit scheme of the finite difference method is applied. The example under consideration deals with the friction stir welding of a plate (0.7 cm thick) made of Al 6082-T6 by use of a tool made of tungsten alloy, whereas the material subjected to welding was TiC powder. Obtained results confirm both quantitatively and qualitatively experimental observations that the superior temperature corresponds to the zone where the pin joints the shoulder.

Research paper thumbnail of Wpływ parametrów procesu FSW na właściwości aluminiowych złączy

Odkąd pod koniec XX wieku opracowano metodę zgrzewania tarciowego z mieszaniem materiału zgrzeiny... more Odkąd pod koniec XX wieku opracowano metodę zgrzewania tarciowego z mieszaniem materiału zgrzeiny (z ang. Friction Stir Welding, FSW), znajduje ona coraz szersze zastosowanie w różnych gałęziach przemysłu, m.in. w przemyśle transportowym, energetycznym czy też elektronicznym. Mimo licznych zalet procesu FSW, w porównaniu do konwencjonalnych metod spajania, ciągle prowadzone są intensywne badania mające na celu opracowanie odpowiedniego doboru parametrów technologicznych oraz geometrii stosowanych narzędzi, tak aby uzyskiwać złącza o jak najlepszych właściwościach. Przeprowadzenie procesu optymalizacji wymagane jest każdorazowo dla nowo zgrzewanego materiału. Dostosowanie właściwych parametrów procesu FSW, w których kluczową rolę odgrywają prędkość obrotowa oraz prędkość posuwu narzędzia, umożliwia nie tylko wykonanie złączy wolnych od wad, ale również w sposób istotny wpływa na efektywność procesu, przez co możliwe jest zmniejszenie pracochłonności i kosztów wytwarzania. Artykuł porusza zagadnienia związane z optymalizacją parametrów procesu zgrzewania tarciowego z mieszaniem materiału zgrzeiny. Analizowano wpływ zmiany prędkości posuwu oraz prędkości obrotowej narzędzia na właściwości strukturalne i wytrzymałościowe złączy aluminiowych. Badania przeprowadzono dla stopu gatunku 6063. Wykonane złącza poddano mi.in. badaniom wizualnym, pomiarom twardości, obserwacjom mikrostrukturalnym oraz statycznej próbie wytrzymałości na rozciąganie.