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Tamás Mankovits
Department of Mechanical Engineering, Faculty of Engineering, University of Debrecen, Ótemető Street 2-4, 4028 Debrecen, Hungary

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Journal article
Published: 21 July 2021 in International Review of Applied Sciences and Engineering
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Over the recent years metallic foams have become a popular material due to their unique characteristics like low density coupled with beneficial mechanical properties such as good energy absorption, heat resistance, flame resistance, etc. However, their production processes (foaming) is highly stochastic which results in an inhomogeneous foam structure. Hybrid aluminum foam with closed-cell has been manufactured using direct foaming method coupled with the Taguchi Design of Experiments (DOE). Image analysis has been carried out to determine the average porous area and pore size. The influence of the production parameters (amount of foaming agent added, mixing speed and temperature) on the pore size and the porous area has been analyzed using the statistical Taguchi technique. From the experiments it was seen that the most important control factor for both the pore size and the porous area is the amount of the foaming agent added, followed by temperature and stirring speed. Furthermore, the statistical significance of these manufacturing parameters on the response was also investigated by performing analysis of variance (ANOVA) statistical method.

ACS Style

Hamid Ali; András Gábora; Muhammad Ali Naeem; Gábor Kalácska; Tamás Mankovits. Effect of the manufacturing parameters on the pore size and porosity of closed-cell hybrid aluminum foams. International Review of Applied Sciences and Engineering 2021, 12, 230 -237.

AMA Style

Hamid Ali, András Gábora, Muhammad Ali Naeem, Gábor Kalácska, Tamás Mankovits. Effect of the manufacturing parameters on the pore size and porosity of closed-cell hybrid aluminum foams. International Review of Applied Sciences and Engineering. 2021; 12 (3):230-237.

Chicago/Turabian Style

Hamid Ali; András Gábora; Muhammad Ali Naeem; Gábor Kalácska; Tamás Mankovits. 2021. "Effect of the manufacturing parameters on the pore size and porosity of closed-cell hybrid aluminum foams." International Review of Applied Sciences and Engineering 12, no. 3: 230-237.

Journal article
Published: 17 May 2021 in Applied Sciences
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Previously, a dynamic model and a simulation program for series wound DC motors (SWDCM) were developed in MATLAB/Simulink for modelling them in electric vehicles and mechatronic systems. The electromagnetic characteristics of the motor (electric resistances, dynamic inductances), which serve as input parameters of the program, were also measured. Additionally, locked rotor response measurements were performed to test the accuracy of the measured electromagnetic characteristics. This paper presents the experimental procedure and the results of dynamics test measurements that were performed on the same motor, including the procedure for the determination of the necessary input dynamic parameters for the simulation. While the motor spins up from rest, the intensity of the electric current and the angular speed of the rotor are measured. Finally, the simulation and dynamic test results are compared to check the proper operation of the simulation program.

ACS Style

Attila Szántó; János Kiss; Tamás Mankovits; Gusztáv Szíki. Dynamic Test Measurements and Simulation on a Series Wound DC Motor. Applied Sciences 2021, 11, 4542 .

AMA Style

Attila Szántó, János Kiss, Tamás Mankovits, Gusztáv Szíki. Dynamic Test Measurements and Simulation on a Series Wound DC Motor. Applied Sciences. 2021; 11 (10):4542.

Chicago/Turabian Style

Attila Szántó; János Kiss; Tamás Mankovits; Gusztáv Szíki. 2021. "Dynamic Test Measurements and Simulation on a Series Wound DC Motor." Applied Sciences 11, no. 10: 4542.

Journal article
Published: 25 March 2021 in Sustainability
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In addition to the examination of electric power from local renewables, this study has sought the answer to the question of what proportion of vehicles are fueled by environmentally friendly energy saving technologies in the vehicle fleets of Hungarian settlements. Further, the study attempts to shed light on the self-sufficiency of Hungarian settlements with respect to the electricity and transport segments. In our assessments, the performance of small-scale household power plants (SSHPPs) utilizing local renewable energy sources, and small-scale power plants with installed capacities under 0.5 MW, was taken into account, as were the proportions of vehicles operating with partly or completely clean energy sources in the vehicle fleets of the individual settlements. Finally, the composition of the vehicle fleet has been examined in the light of the quantities of renewable electricity generated in the individual settlements, in order to consider whether these settlements are capable of covering the energy needs of their vehicle stocks from local sources. In the light of the results, the changes generated by the incentives and investments introduced over the past ten years can be established and subsequently, the energy policy needs in the future can be assessed. Our study has incorporated energy geography and settlement geography aspects.

ACS Style

Balázs Kulcsár; Tamás Mankovits; Piroska Ailer. The Renewable Energy Production Capability of Settlements to Meet Local Electricity and Transport Energy Demands. Sustainability 2021, 13, 3636 .

AMA Style

Balázs Kulcsár, Tamás Mankovits, Piroska Ailer. The Renewable Energy Production Capability of Settlements to Meet Local Electricity and Transport Energy Demands. Sustainability. 2021; 13 (7):3636.

Chicago/Turabian Style

Balázs Kulcsár; Tamás Mankovits; Piroska Ailer. 2021. "The Renewable Energy Production Capability of Settlements to Meet Local Electricity and Transport Energy Demands." Sustainability 13, no. 7: 3636.

Journal article
Published: 10 March 2021 in Materials
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The wear behaviour of two martensitic and one multiphase steel targeted for abrasion and erosion applications in agriculture and mining industry were investigated in three abrasive test systems with different complexity. Scratch tests were performed with different indenter radii, shapes, and loads. The material behaviour was also investigated in multi-asperity contact systems. Pin-on-disc tests were performed with various loads and abrasive particles, as well as abrasive slurry-pot tests with different sliding velocities, distances, and impact angles of the abrasive media were performed. Comparing the test systems, the tested materials ranked similarly based on their wear performance, however, in each configuration, the dominant variable of the wear mechanism differed. The significance and contributions of test paramecenterters, the material’s mechanical properties (H, σM, σY, E, εεM, εεB, W, σc, Ec) and the dimensionless numbers formed from them were investigated on the wear behaviour and the surface deformation. Correlation between parameters was established by multiple linear regression models. The sensitivity of the tested materials to abrasion was evaluated taking into account the wide range of influencing parameters.

ACS Style

Ádám Kalácska; László Székely; Róbert Keresztes; András Gábora; Tamás Mankovits; Patrick De Baets. Abrasive Sensitivity of Martensitic and a Multi-Phase Steels under Different Abrasive Conditions. Materials 2021, 14, 1343 .

AMA Style

Ádám Kalácska, László Székely, Róbert Keresztes, András Gábora, Tamás Mankovits, Patrick De Baets. Abrasive Sensitivity of Martensitic and a Multi-Phase Steels under Different Abrasive Conditions. Materials. 2021; 14 (6):1343.

Chicago/Turabian Style

Ádám Kalácska; László Székely; Róbert Keresztes; András Gábora; Tamás Mankovits; Patrick De Baets. 2021. "Abrasive Sensitivity of Martensitic and a Multi-Phase Steels under Different Abrasive Conditions." Materials 14, no. 6: 1343.

Journal article
Published: 12 October 2020 in Materials
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Fiber-reinforced hybrid composites are the most commonly used dry-friction materials in the automotive industry. On the other hand, the great variety of components utilized these days in such material systems often requires identification investigations for a complex characterization. The development history of clutch materials was reviewed, highlighting and understanding the milestones and efforts leading to the creation of these materials. Investigations were performed to determine mechanical stiffness matrix parameters and thermal properties of a woven fiber yarn (glass fiber with aromatic polyamide, copper, and poly-acrylic-nitrile (PAN) reinforced friction material, revealing and solving challenges faced during identification efforts. This study grants an effective reference and a novel guidance for material identification methods for similar complex materials, and the results provide input parameters for thermomechanical simulation contact model development, which will cover friction material lifetime effects on dry clutch tribology in a future study.

ACS Style

Roland Biczó; Gábor Kalácska; Tamás Mankovits. Micromechanical Model and Thermal Properties of Dry-Friction Hybrid Polymer Composite Clutch Facings. Materials 2020, 13, 4508 .

AMA Style

Roland Biczó, Gábor Kalácska, Tamás Mankovits. Micromechanical Model and Thermal Properties of Dry-Friction Hybrid Polymer Composite Clutch Facings. Materials. 2020; 13 (20):4508.

Chicago/Turabian Style

Roland Biczó; Gábor Kalácska; Tamás Mankovits. 2020. "Micromechanical Model and Thermal Properties of Dry-Friction Hybrid Polymer Composite Clutch Facings." Materials 13, no. 20: 4508.

Journal article
Published: 22 May 2020 in Applied Sciences
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In rubber bumper design, the most important mechanical property of the product is the force–displacement curve under compression and its fulfillment requires an iterative design method. Design engineers can handle this task with the modification of the product shape, which can be solved with several optimization methods if the parameterization of the design process is determined. The numerical method is a good way to evaluate the working characteristics of the rubber product; furthermore, automation of the whole process is feasible with the use of Visual Basic for Application. An axisymmetric finite element model of a rubber bumper was built with the use of a calibrated two-term Mooney–Rivlin material model. A two-dimensional shape optimization problem was introduced where the objective function was determined as the difference between the initial and the optimum characteristics. Our goal was to integrate a surrogate model-based parameter selection of local search algorithms for the optimization process. As a metamodeling technique, cubic support vector regression was selected and seemed to be suitable to accurately predict the nonlinear objective function. The novel optimization procedure which applied the support vector regression model in the parameter selection process of the stochastic search algorithm proved to be an efficient method to find the global optimum of the investigated problem.

ACS Style

Dávid Huri; Tamás Mankovits. Parameter Selection of Local Search Algorithm for Design Optimization of Automotive Rubber Bumper. Applied Sciences 2020, 10, 3584 .

AMA Style

Dávid Huri, Tamás Mankovits. Parameter Selection of Local Search Algorithm for Design Optimization of Automotive Rubber Bumper. Applied Sciences. 2020; 10 (10):3584.

Chicago/Turabian Style

Dávid Huri; Tamás Mankovits. 2020. "Parameter Selection of Local Search Algorithm for Design Optimization of Automotive Rubber Bumper." Applied Sciences 10, no. 10: 3584.

Journal article
Published: 29 April 2020 in Periodica Polytechnica Mechanical Engineering
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The important properties of metallic foams such as good energy absorption, recyclability, noise absorption, etc. have put them at the forefront of technological development over recent years, especially for fields where the weight is a major concern. The production however, is a highly stochastic process which leads to their inhomogeneous nature. In this paper closed-cell aluminum foam specimens have been produced by direct foaming technique and investigated mechanically, following the principles of Taguchi Design of Experiments (DOE). The important compressive properties of the produced specimens such as the structural stiffness, yield strength, plateau stress and energy absorption have been measured through uniaxial compression tests and the effect of the manufacturing parameters (the temperature, the mixing speed and the amount of foaming agent added) on the energy absorption capacity of the foam is analyzed. From experiments, it was observed that the temperature is the most dominant control factor for the energy absorption capability of the foam followed by the foaming content and the mixing speed. ANOVA statistical analysis was also performed to determine the statistical significance of these parameters on the response.

ACS Style

Muhammad Ail Naeem; András Gábora; Tamás Mankovits. Influence of the Manufacturing Parameters on the Compressive Properties of Closed Cell Aluminum Foams. Periodica Polytechnica Mechanical Engineering 2020, 64, 172 -178.

AMA Style

Muhammad Ail Naeem, András Gábora, Tamás Mankovits. Influence of the Manufacturing Parameters on the Compressive Properties of Closed Cell Aluminum Foams. Periodica Polytechnica Mechanical Engineering. 2020; 64 (2):172-178.

Chicago/Turabian Style

Muhammad Ail Naeem; András Gábora; Tamás Mankovits. 2020. "Influence of the Manufacturing Parameters on the Compressive Properties of Closed Cell Aluminum Foams." Periodica Polytechnica Mechanical Engineering 64, no. 2: 172-178.

Journal article
Published: 14 April 2020 in International Journal of Engineering and Management Sciences
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Jelen közleményben áttekintjük a modern elektromos és hibrid rendszerű járműhajtásokat. Továbbá áttekintjük az azokban alkalmazott villanymotorok, akkumulátorok és üzemanyagcellák típusait, valamint a felépítésükkel és jellemző tulajdonságaikkal foglalkozó szakirodalmat. Továbbá, mivel a hibrid járművek fontos része a belsőégésű motor, áttekintjük azok hatékonyságának növelésére, valamint emissziójuk csökkentésére alkalmazott eljárásokat.

ACS Style

Attila Szántó; Tamás Mankovits; Gusztáv Áron Szíki. A modern járművekben alkalmazott hajtásrendszerek áttekintése. International Journal of Engineering and Management Sciences 2020, 5, 728 -732.

AMA Style

Attila Szántó, Tamás Mankovits, Gusztáv Áron Szíki. A modern járművekben alkalmazott hajtásrendszerek áttekintése. International Journal of Engineering and Management Sciences. 2020; 5 (1):728-732.

Chicago/Turabian Style

Attila Szántó; Tamás Mankovits; Gusztáv Áron Szíki. 2020. "A modern járművekben alkalmazott hajtásrendszerek áttekintése." International Journal of Engineering and Management Sciences 5, no. 1: 728-732.

Journal article
Published: 02 February 2020 in Polymers
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The present paper concentrates on the toughness and the degree of crystallinity of the magnesium-catalyzed polyamide 6 rods cast in different diametres, which are commonly used for gear manufacturing. Its toughness cannot be regarded as a constant feature due to the casting technology. The mechanical properties of the semi-finished products are sensitive to the manufactured dimension, e.g., cast diameter, which are investigated by the Charpy impact test and tensile impact test. It is generally accepted that the impact strength and tensile-impact strength correlate with the degree of crystallinity beside many other material’s feature. Crystallinity is evaluated by Differential Scanning Calorimetry. The aim of this study is to determine the relationship between toughness and crystallinity of the magnesium-catalyzed cast PA6 rods with different diameters. For the research cast rods between 40 and 300 mm diameter were selected in seven-dimensional steps. Based on the results, it was found that the toughness depends strongly on the diameter size. Furthermore, it is proved that the crystallinity explains 62.3% of the variation of the Charpy’s impact strengths, while the tensile impact method was not suitable to detect the difference between the test samples.

ACS Style

Miklós Odrobina; Tamás Deák; László Székely; Tamás Mankovits; Róbert Zsolt Keresztes; Gábor Kalácska. The Effect of Crystallinity on the Toughness of Cast Polyamide 6 Rods with Different Diameters. Polymers 2020, 12, 293 .

AMA Style

Miklós Odrobina, Tamás Deák, László Székely, Tamás Mankovits, Róbert Zsolt Keresztes, Gábor Kalácska. The Effect of Crystallinity on the Toughness of Cast Polyamide 6 Rods with Different Diameters. Polymers. 2020; 12 (2):293.

Chicago/Turabian Style

Miklós Odrobina; Tamás Deák; László Székely; Tamás Mankovits; Róbert Zsolt Keresztes; Gábor Kalácska. 2020. "The Effect of Crystallinity on the Toughness of Cast Polyamide 6 Rods with Different Diameters." Polymers 12, no. 2: 293.

Conference paper
Published: 10 August 2018 in IOP Conference Series: Materials Science and Engineering
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For orthopedic applications 3D metal printing delivers flexible and tailor-made solutions. The greatest advantage of the additive manufacturing is that patient-specific implants can be manufactured. Determination of compressive properties of implant structure by numerical way is a demanding engineering task and it is indispensable for design purposes. In design of load-bearing biomedical implants the elastic behavior under working circumstances has to be considered. The professional literature offers different unit cell models to represent trabecular structures. In this paper the cubic open cell structures are established using CAD application and linear-elastic finite element simulations are performed. The aim of the research is to compare the material response of the investigated geometrical models.

ACS Style

T Mankovits. Numerical analysis of unit cell models for orthopedic applications. IOP Conference Series: Materials Science and Engineering 2018, 393, 012019 .

AMA Style

T Mankovits. Numerical analysis of unit cell models for orthopedic applications. IOP Conference Series: Materials Science and Engineering. 2018; 393 (1):012019.

Chicago/Turabian Style

T Mankovits. 2018. "Numerical analysis of unit cell models for orthopedic applications." IOP Conference Series: Materials Science and Engineering 393, no. 1: 012019.

Journal article
Published: 01 April 2018 in Acta Materialia Transylvanica
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The geometrical modelling of metal foams remains one of the greatest challenges facing researchers in the field. In this paper the analysis of the inner structure of closed-cell aluminium foam - an essential part of the construction of an idealized foam model - is presented. With the application of special purpose software the properties of the foam cells can be mapped precisely and the results applied to the development of idealized foam geometry constructed in CAD applications.

ACS Style

Tamás Antal Varga; Tamás Mankovits. Metal Foam Analysis Based on CT Layers. Acta Materialia Transylvanica 2018, 1, 57 -60.

AMA Style

Tamás Antal Varga, Tamás Mankovits. Metal Foam Analysis Based on CT Layers. Acta Materialia Transylvanica. 2018; 1 (1):57-60.

Chicago/Turabian Style

Tamás Antal Varga; Tamás Mankovits. 2018. "Metal Foam Analysis Based on CT Layers." Acta Materialia Transylvanica 1, no. 1: 57-60.

Journal article
Published: 01 December 2014 in International Review of Applied Sciences and Engineering
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The development of an efficient procedure for 3d modeling and finite element simulation of metal foams is one of the greatest challenges for engineer researchers nowadays. Creating 3d CAD model is alone a demanding engineering task due to its extremely complex geometry, and the proper finite element analysis process is still in the center of the research. The increasingly widespread application of the metal foams, e.g. in vehicle and medical industry, requires this knowledge in the design phase. A closed-cell metal foam is studied using different analyzing methods where the aim is to collect information about the composition and geometry (structure) that is satisfactory for the later research. Using statistical methods microscopic, X-ray and surface analyzing studies on the specimens produced according to the concerning standard are evaluated. The main goal of this part of the project is to obtain structural information and to determine the homogeneity or the in-homogeneity property of the metal foam specimens taken from different locations.

ACS Style

T. Mankovits; I. Budai; G. Balogh; A. Gábora; I. Kozma; T. Varga; S. Manó; I. Kocsis. Structural analysis and its statistical evaluation of a closed-cell metal foam. International Review of Applied Sciences and Engineering 2014, 5, 135 -143.

AMA Style

T. Mankovits, I. Budai, G. Balogh, A. Gábora, I. Kozma, T. Varga, S. Manó, I. Kocsis. Structural analysis and its statistical evaluation of a closed-cell metal foam. International Review of Applied Sciences and Engineering. 2014; 5 (2):135-143.

Chicago/Turabian Style

T. Mankovits; I. Budai; G. Balogh; A. Gábora; I. Kozma; T. Varga; S. Manó; I. Kocsis. 2014. "Structural analysis and its statistical evaluation of a closed-cell metal foam." International Review of Applied Sciences and Engineering 5, no. 2: 135-143.

Journal article
Published: 01 June 2013 in International Review of Applied Sciences and Engineering
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This paper presents a novel solution for shape optimization of compressed rubber parts. The procedure is based on the finite element method (FEM). A special purpose FEM code written in FORTRAN has been developed for the analysis of nearly incompressible axi-symmetric rubber parts. Numerical stability of the code and sensitivity analysis of the FEM input parameters are investigated. The aim of the parameter optimization is to reduce the time consuming FEM computations for the optimization process. The objective of the optimization is to find the optimal shape of the investigated rubber parts with a specified load-displacement curve. A regression model is used to determine the connection between the input and output data calculated by the FEM.

ACS Style

T. Mankovits; Imre Kocsis; T. Portik; T. Szabó; Istvan Paczelt. Shape design of rubber part using FEM. International Review of Applied Sciences and Engineering 2013, 4, 85 -94.

AMA Style

T. Mankovits, Imre Kocsis, T. Portik, T. Szabó, Istvan Paczelt. Shape design of rubber part using FEM. International Review of Applied Sciences and Engineering. 2013; 4 (1):85-94.

Chicago/Turabian Style

T. Mankovits; Imre Kocsis; T. Portik; T. Szabó; Istvan Paczelt. 2013. "Shape design of rubber part using FEM." International Review of Applied Sciences and Engineering 4, no. 1: 85-94.