TY - JOUR AU - Monkova, Katarina AU - Monka, Peter Pavol AU - Pantazopoulos, George A. AU - Toulfatzis, Anagnostis I. AU - Smeringaiova, Anna AU - Torok, Jozef AU - Papadopoulou, Sofia TI - Effect of Crosshead Speed and Volume Ratio on Compressive Mechanical Properties of Mono- and Double-Gyroid Structures Made of Inconel 718 JF - MATERIALS J2 - MATERIALS VL - 16 PY - 2023 IS - 14 PG - 16 SN - 1996-1944 DO - 10.3390/ma16144973 UR - https://m2.mtmt.hu/api/publication/34342678 ID - 34342678 AB - The current development of additive technologies brings not only new possibilities but also new challenges. One of them is the use of regular cellular materials in various components and constructions so that they fully utilize the potential of porous structures and their advantages related to weight reduction and material-saving while maintaining the required safety and operational reliability of devices containing such components. It is therefore very important to know the properties of such materials and their behavior under different types of loads. The article deals with the investigation of the mechanical properties of porous structures made by the Direct Metal Laser Sintering (DMLS) of Inconel 718. Two types of basic cell topology, mono-structure Gyroid (G) and double-structure Gyroid + Gyroid (GG), with material volume ratios of 10, 15 and 20 %, were studied within our research to compare their properties under quasi-static compressive loading. The testing procedure was performed at ambient temperature with a servo-hydraulic testing machine at three different crosshead testing speeds. The recorded data were processed, while the stress-strain curves were plotted, and Young's modulus, the yield strength Re-0.2, and the stress at the first peak of the local maximum & sigma;(LocMax) were identified. The results showed the best behavior under compression load among the studied structures displayed by mono-structure Gyroid at 10 %. At the same time, it can be concluded that the wall thickness of the structure plays an important role in the compressive properties but on the other hand, crosshead speed doesn & PRIME;t influence results significantly. LA - English DB - MTMT ER - TY - JOUR AU - Monkova, Katarina AU - Monka, Peter Pavol AU - Pantazopoulos, George AU - Toulfatzis, Anagnostis AU - Papadopoulou, Sofia AU - Koroľ, Martin TI - Effect of Relative Weight on Compression Behaviour of 3D Printed Porous Structure Made of Aluminium Alloy JF - KEY ENGINEERING MATERIALS J2 - KEY ENG MATER VL - 964 PY - 2023 SP - 103 EP - 107 PG - 5 SN - 1013-9826 DO - 10.4028/p-Y8sYkZ UR - https://m2.mtmt.hu/api/publication/34441677 ID - 34441677 AB - Metamaterials, including materials with regularly distributed porous structures, are currently a very intensively developing area of the technology industry. They bring a number of advantages compared to components produced in the classic way. The primary focus of such porous structures is to lighten the product and at the same time preserve its physical or mechanical properties, which subsequently conveys benefits in the form of saving material for the production of the device, and when used in aeroplanes or cars, they also save the amount of fuel consumed, so it can be said that such products and equipment are more user-friendly and environmentally friendly. There are many types of structures with different configurations, different types of basic cells, and different distributions of pores or their topology, so it is very important for the designer to know and decide which type of structure is most advantageous to use in the proposed product that will be subjected to a specific load. The article deals with the investigation of the mechanical properties of porous structures produced by the Direct Laser Metal Sintering (DLMS) method. It is focused on experimentally tested samples made of AlSi10Mg alloy with the Neovius structure, which were produced with four different relative weights. Results of quasi-static pressure testing at a crossbar speed of 10 mm/min (testing machine 250 kN Instron 8802 servo-hydraulic machine) point out that the trend of the influence of the relative weights on the First Peak Local Maximum best described by a second-order polynomial function. LA - English DB - MTMT ER - TY - JOUR AU - Deng, Chunxia AU - Li, Junye AU - Meng, Wenqing AU - Zhao, Weihong TI - Effect of Particle Velocity on Microcutting Process of Fe-C Alloy by Molecular Dynamics JF - MICROMACHINES J2 - MICROMACHINES-BASEL VL - 13 PY - 2022 IS - 8 PG - 15 SN - 2072-666X DO - 10.3390/mi13081339 UR - https://m2.mtmt.hu/api/publication/33390986 ID - 33390986 AB - In order to study the material removal mechanism of Fe-C alloy surfaces in the particle microcutting process, the molecular dynamics method was used to study the material deformation and removal rules during the particle microcutting process. By analyzing and discussing the particle cutting force, atomic energy, atomic displacement, lattice structure, and dislocation in the particle microcutting process under different cutting velocities, the material removal mechanism is revealed. The results show that the atomic binding energy of Fe-C alloy increases with an increase in particle cutting velocity. The cutting force of particles and atomic potential energy of the workpiece increase obviously. The accumulated strain energy and dislocation energy in the lattice increase, the lattice deformation becomes more severe, and the material is prone to plastic deformation. The atoms form atomic groups at the front of the particle and are then remove from the surface of Fe-C alloy in the form of chips. LA - English DB - MTMT ER - TY - JOUR AU - Wang, Yachao AU - Minhaj, M AU - Wang, Xinnan AU - Shi, Jing TI - Deformation behaviors and inverse Hall-Petch effect in nanoindentation of silicon: An atomistic simulation study with experimental validation JF - JOURNAL OF MANUFACTURING PROCESSES J2 - J MANUFACT PROCES VL - 74 PY - 2022 SP - 319 EP - 331 PG - 13 SN - 1526-6125 DO - 10.1016/j.jmapro.2021.12.032 UR - https://m2.mtmt.hu/api/publication/32577348 ID - 32577348 LA - English DB - MTMT ER - TY - JOUR AU - Balázs, Barnabás Zoltán AU - Geier, Norbert AU - Takács, Márton AU - Davim, J. Paulo TI - A review on micro-milling: recent advances and future trends JF - INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY J2 - INT J ADV MANUFACT TECHNOL VL - 112 PY - 2021 IS - 3-4 SP - 655 EP - 684 PG - 36 SN - 0268-3768 DO - 10.1007/s00170-020-06445-w UR - https://m2.mtmt.hu/api/publication/31793490 ID - 31793490 N1 - Department of Manufacturing Science and Engineering, Faculty of Mechanical Engineering, Budapest University of Technology and Economics, Budapest, Hungary Department of Mechanical Engineering, University of Aveiro, Aveiro, Portugal Cited By :21 Export Date: 10 May 2022 CODEN: IJATE Correspondence Address: Balázs, B.Z.; Department of Manufacturing Science and Engineering, Hungary; email: balazs@manuf.bme.hu AB - Recently, mechanical micro-milling is one of the most promising micro-manufacturing processes for productive and accurate complex-feature generation in various materials including metals, ceramics, polymers and composites. The micro-milling technology is widely adapted already in many high-tech industrial sectors; however, its reliability and predictability require further developments. In this paper, micro-milling related recent results and developments are reviewed and discussed including micro-chip removal and micro-burr formation mechanisms, cutting forces, cutting temperature, vibrations, surface roughness, cutting fluids, workpiece materials, process monitoring, micro-tools and coatings, and process-modelling. Finally, possible future trends and research directions are highlighted in the micro-milling and micro-machining areas. LA - English DB - MTMT ER - TY - JOUR AU - Huang, Y. AU - Wang, M. AU - Xu, Y. AU - Zhu, F. TI - Investigation on gallium nitride with N-vacancy defect nano-grinding by molecular dynamics JF - JOURNAL OF MANUFACTURING PROCESSES J2 - J MANUFACT PROCES VL - 57 PY - 2020 SP - 153 EP - 162 PG - 10 SN - 1526-6125 DO - 10.1016/j.jmapro.2020.06.018 UR - https://m2.mtmt.hu/api/publication/31393426 ID - 31393426 LA - English DB - MTMT ER - TY - CHAP AU - Karkalos, N. E. AU - Markopoulos, A. P. ED - Nitu, EL ED - Slatineanu, L ED - Iordache, MD ED - Plaiasu, AG ED - Dodun, O ED - Nagit, G ED - Stanescu, ND ED - Anghel, DC ED - Rizea, AC ED - Clenci, AC ED - Oproescu, M TI - Examination of the influence of cutting conditions on nanometric face milling using MD models T2 - INNOVATIVE MANUFACTURING ENGINEERING AND ENERGY (IMANEE 2019) - 50 YEARS OF HIGHER TECHNICAL EDUCATION AT THE UNIVERSITY OF PITESTI PB - IOP Publishing Ltd CY - Bristol T3 - 2nd International Conference on Competitive Materials and Technological Processes (IC-CMTP), ISSN 1757-8981 PY - 2019 PG - 6 DO - 10.1088/1757-899X/564/1/012008 UR - https://m2.mtmt.hu/api/publication/33390989 ID - 33390989 AB - Machining is indispensable in the manufacturing sector for a wide variety of products. In the last years, the field of micro- and nano-scale manufacturing attracted a lot of interest, especially in high-end industries such as the biomedical and electronics industries. In order to improve the efficiency of these processes and understand the various underlying phenomena, it is important to develop relevant theoretical models. However, methods such as the Finite Element Method (FEM), which are well-established in the macro- or micro-scale level are not appropriate for creating models of nano-scale processes, as they treat the materials as continua. For that reason, the Molecular Dynamics (MD) method is usually used for simulations of nano-metric machining processes such as nano-milling. In the present study, a MD model of nano-milling is created and an investigation regarding the effect of cutting conditions such as feed rate and cutting speed on cutting forces, temperature and subsurface damage is conducted. LA - English DB - MTMT ER -