@inproceedings{MTMT:36366200,
	title = {Parametric Analysis of Metal Matrix Syntactic Foams},
	url = {https://m2.mtmt.hu/api/publication/36366200},
	author = {Fekete, Imre and Czinege, Imre},
	booktitle = {Proceedings of 12th International Conference on Mechatronics and Control Engineering},
	doi = {10.1007/978-981-96-6452-8_2},
	unique-id = {36366200},
	year = {2026},
	pages = {15-33}
}

@article{MTMT:34849476,
	title = {Experimental study on the effect of filament-extrusion rate on the structural, mechanical and thermal properties of material extrusion 3D-printed polylactic acid (PLA) products},
	url = {https://m2.mtmt.hu/api/publication/34849476},
	author = {Lendvai, László and Fekete, Imre and Rigotti, Daniele and Pegoretti, Alessandro},
	doi = {10.1007/s40964-024-00646-5},
	journal-iso = {PROG ADDIT MANUF},
	journal = {PROGRESS IN ADDITIVE MANUFACTURING},
	volume = {10},
	unique-id = {34849476},
	issn = {2363-9512},
	abstract = {Material extrusion (MEX), also commonly referred to as fused deposition modeling (FDM) or fused filament fabrication (FFF) is currently one of the most commonly used additive manufacturing techniques. The quality of the 3D-printed objects fabricated by MEX methods highly relies on various printing parameters, one of which is the so-called filament extrusion multiplier ( k ). In this study, 3D-printed parts were prepared by MEX technique during which the material feeding rate was adjusted by varying the extrusion multiplier in the range of 97–105% ( k  = 0.97–1.05). The fabricated parts were tested for their geometrical, structural, mechanical, and thermal conductivity properties. Based on computed tomographic analysis and scanning electron microscopic images, increasing the k parameter resulted in smaller voids, along with gradually decreasing porosity (from 5.82 to 0.05%). Parallel to the decreasing defects, the thermal conductivity of the parts improved from 0.157 to 0.188 W/mK as determined by light-flash analysis technique. On the other hand, when k was set to ≥ 1.03 the geometrical accuracy declined, the size of the specimens considerably increased relative to the nominal values, especially in the X–Y directions due to excess material getting “squeezed” on the sides of the specimens. This latter phenomenon also resulted in the formation of a number of stress concentration sites, which manifested in the decrease of mechanical properties. Accordingly, the tensile, flexural, and impact strength of the samples improved up to k  = 1.03; however, above that it dropped considerably.},
	year = {2025},
	eissn = {2363-9520},
	pages = {619-629},
	orcid-numbers = {Lendvai, László/0000-0003-3670-327X; Rigotti, Daniele/0000-0002-2337-8669; Pegoretti, Alessandro/0000-0001-9641-9735}
}

@article{MTMT:36144057,
	title = {Effect of filament humidity on the properties of material extrusion 3D-printed acrylonitrile butadiene styrene/hexagonal boron nitride composites},
	url = {https://m2.mtmt.hu/api/publication/36144057},
	author = {Lendvai, László and Jakab, Sándor Kálmán and Fekete, Imre and Rigotti, Daniele and Pegoretti, Alessandro},
	doi = {10.1007/s42247-025-01108-6},
	journal-iso = {EMERGENT MATER},
	journal = {EMERGENT MATERIALS},
	volume = {8},
	unique-id = {36144057},
	issn = {2522-5731},
	abstract = {This study investigates the effect of filament moisture content on material extrusion (MEX) 3D-printed composites using acrylonitrile butadiene styrene (ABS) as the polymer matrix and 0–10 vol% hexagonal boron nitride (BN) as reinforcement. ABS/BN composites were prepared through batchwise compounding and extruded into MEX-suitable filaments. The filaments were conditioned at 30 °C and 10% or 90% relative humidity (RH) before/during direct feeding into the 3D printer. Specimens were fabricated with raster angles parallel (0°) and perpendicular (90°) to their length. Micro- and macrostructural analyses using scanning electron microscopy and computed tomography revealed intensive void formation, especially in BN-filled composites 3D-printed from humid filaments. This was attributed to BN acting as a physical barrier, hindering the outgassing of evaporated water during 3D printing. Mechanical properties were evaluated using tensile and Charpy impact tests. Based on the tensile test results, neat ABS was the least sensitive to filament moisture, with tensile strength at 0° raster angle dropping from 40.5 MPa to 36.7 MPa as storage RH was increased from 10 to 90%. For composites with 10 vol% BN loading, tensile strength dropped from 34.1 MPa to 22.3 MPa. Charpy impact strength exhibited similar reductions, ascribed to the porous structure of the BN-filled composites caused by the evaporated moisture. Thermal conductivity was also examined, showing slightly superior performance for samples 3D-printed from filaments stored in less humid conditions. For unfilled ABS, the conductivity slightly decreased from 0.188 to 0.185 W/mK, while for 10 vol% BN-filled composite, it dropped from 0.778 to 0.617 W/mK.},
	year = {2025},
	eissn = {2522-574X},
	pages = {6791-6806},
	orcid-numbers = {Lendvai, László/0000-0003-3670-327X; Jakab, Sándor Kálmán/0009-0009-9688-6304; Rigotti, Daniele/0000-0002-2337-8669; Pegoretti, Alessandro/0000-0001-9641-9735}
}

@article{MTMT:36447656,
	title = {Determination of Optimal Process Parameters for L-PBF Produced 1.2709 Alloy},
	url = {https://m2.mtmt.hu/api/publication/36447656},
	author = {Lőrincz, Balázs and Nagy, András Lajos and Fekete, Imre and Hatos, István},
	doi = {10.3390/engproc2025113017},
	journal-iso = {ENGENG PROC},
	journal = {ENGINEERING PROCEEDINGS},
	volume = {113},
	unique-id = {36447656},
	year = {2025},
	eissn = {2673-4591}
}

@article{MTMT:33748423,
	title = {Selection of straw waste reinforced sustainable polymer composite using a multi-criteria decision-making approach},
	url = {https://m2.mtmt.hu/api/publication/33748423},
	author = {Singh, Tej and Fekete, Imre and Jakab, Sándor Kálmán and Lendvai, László},
	doi = {10.1007/s13399-023-04132-w},
	journal-iso = {BIOMASS CONV BIOREFINERY},
	journal = {BIOMASS CONVERSION AND BIOREFINERY},
	volume = {14},
	unique-id = {33748423},
	issn = {2190-6815},
	abstract = {The valorization of straw waste as a sustainable and eco-friendly resource in polymer composites is critical for resource recycling and environmental preservation. Therefore, many research works are being carried out regarding the development of wheat straw-based polymer composites to identify the reinforcing potential of these sustainable resources. In this study, three different sizes of wheat straw fibers (60–120 mesh, 35–60 mesh, and 18–35 mesh) were used, and their different ratios (0, 2.5, 5, 10, and 20% by weight) were systematically investigated for the physical and mechanical properties of polypropylene-based sustainable composites. The results indicated that the evaluated composites’ properties are strongly dependent on the quantity and size of the utilized wheat straw. Therefore, a preference selection index was applied to rank the developed sustainable polymer composites to select the best composition. Various properties of the composite materials were considered as criteria for ranking the alternatives, namely tensile strength and modulus, flexural stress at conventional deflection and flexural modulus, impact strength, density, water absorption, material cost, and carbon footprint. The decision-making analysis suggests the alternative with wheat straw content of 20 wt.% (35–60 mesh size) dominating the performance by maximizing the beneficial criteria and minimizing the non-beneficial criteria, making it the most suitable alternative. This study will significantly help formulation designers to deal with the amount and size issues when developing polymeric composites.},
	year = {2024},
	eissn = {2190-6823},
	pages = {21007-21017},
	orcid-numbers = {Singh, Tej/0000-0003-2316-4107; Jakab, Sándor Kálmán/0009-0009-9688-6304; Lendvai, László/0000-0003-3670-327X}
}

@article{MTMT:34827091,
	title = {Agricultural by-product filled poly(lactic acid) biocomposites with enhanced biodegradability: The effect of flax seed meal and rapeseed straw},
	url = {https://m2.mtmt.hu/api/publication/34827091},
	author = {Jakab, Sándor Kálmán and Singh, Tej and Fekete, Imre and Lendvai, László},
	doi = {10.1016/j.jcomc.2024.100464},
	journal-iso = {COMPOS PART C},
	journal = {COMPOSITES PART C: OPEN ACCESS},
	volume = {14},
	unique-id = {34827091},
	issn = {2666-6820},
	year = {2024},
	eissn = {2666-6820},
	orcid-numbers = {Jakab, Sándor Kálmán/0009-0009-9688-6304; Singh, Tej/0000-0003-2316-4107; Lendvai, László/0000-0003-3670-327X}
}

@article{MTMT:34865886,
	title = {Laboratory and numerical investigation of pre-tensioned reinforced concrete railway sleepers combined with plastic-fiber reinforcement},
	url = {https://m2.mtmt.hu/api/publication/34865886},
	author = {Németh, Attila and Ibrahim, Sarah Khaleel and Movahedi Rad, Majid and Szalai, Szabolcs and Major, Zoltán and Kocsis Szürke, Szabolcs and Jóvér, Vivien and Mykola, Sysyn and Dmytro, Kurhan and Harrach, Dániel and Baranyai, Gusztáv and Fekete, Imre and Nagy, Richárd and Csótár , Hanna and Klaudia, Madarász and Pollák, András and Bálint, Molnár and Hermán, Bence and Kuczmann, Miklós and Gáspár, László and Fischer, Szabolcs},
	doi = {10.3390/polym16111498},
	journal-iso = {POLYMERS-BASEL},
	journal = {POLYMERS},
	volume = {16},
	unique-id = {34865886},
	year = {2024},
	eissn = {2073-4360},
	orcid-numbers = {Harrach, Dániel/0000-0003-4819-8506; Baranyai, Gusztáv/0000-0003-3369-8823; Csótár , Hanna/0000-0003-1675-4053; Hermán, Bence/0009-0005-4620-5022; Fischer, Szabolcs/0000-0001-7298-9960}
}

@article{MTMT:35131120,
	title = {Effect of Energy Density on the Mechanical Properties of 1.2709 Maraging Steel Produced by Laser Powder Bed Fusion},
	url = {https://m2.mtmt.hu/api/publication/35131120},
	author = {Hatos, István and Hargitai, Hajnalka and Fekete, Gusztáv and Fekete, Imre},
	doi = {10.3390/ma17143432},
	journal-iso = {MATERIALS},
	journal = {MATERIALS},
	volume = {17},
	unique-id = {35131120},
	abstract = {The unusual combination of the fundamentally contradictory properties of high tensile strength and high fracture toughness found in maraging steel makes it well suited for safety-critical applications that require high strength-to-weight materials. In certain instances, additive manufacturing (AM) has produced materials that may be desirable for safety-critical applications where impact toughness is a key property, such as structural parts for the aerospace industry or armor plates for military applications. Understanding the influence of process parameters and defect structure on the properties of maraging steel parts produced via laser powder bed fusion (LPBF) is a fundamental step towards the broader use of AM technologies for more demanding applications. In this research, the impact energy of V-notched specimens made of 1.2709 maraging steel produced by LPBF was determined via Charpy impact testing. Specimens were produced using different processing parameter sets. By combining the process parameters with the porosity values of the parts, we demonstrate that an almost full prediction of the impact properties can be achieved, paving the way for significantly reducing the expenses of destructive testing.},
	year = {2024},
	eissn = {1996-1944},
	orcid-numbers = {Fekete, Gusztáv/0000-0002-6138-8382}
}

@article{MTMT:35422527,
	title = {Influence of environmental humidity during filament storage on the structural and mechanical properties of material extrusion 3D-printed poly(lactic acid) parts},
	url = {https://m2.mtmt.hu/api/publication/35422527},
	author = {Lendvai, László and Fekete, Imre and Jakab, Sándor Kálmán and Szarka, Györgyi Éva and Verebélyi, Klára and Iván, Béla},
	doi = {10.1016/j.rineng.2024.103013},
	journal-iso = {RESULT ENGIN},
	journal = {RESULTS IN ENGINEERING},
	volume = {24},
	unique-id = {35422527},
	issn = {2590-1230},
	abstract = {Material extrusion (MEX) is one of the most widely used additive manufacturing techniques these days. This study investigates how the properties of MEX 3D-printed objects depend on the relative humidity (RH) conditions in which filaments are stored before and during the manufacturing process. Poly(lactic acid) (PLA) filament was drawn directly from a humidity-controlled chamber into the MEX 3D printer’s nozzle. For each set of samples, the filaments were conditioned under different RH conditions, ranging from 10% to 90%. The macrostructure of the fabricated products was characterized using computed tomography, revealing increased porosity at higher RH values (from 0.84% to 4.42%). The increased porosity at higher storage RH is attributed to under-extrusion and volatile entrapment due to excess moisture. With growing storage RH, the melt flow rate of PLA also gradually increased, indicating a plasticizing effect of humidity on the biopolymer. Gel permeation chromatography and differential scanning calorimetry analyses were conducted to determine whether hydrolytic chain scission took place when PLA was processed in the presence of excessive moisture. Neither measurement indicated any considerable alteration in molecular integrity and crystalline structure as a function of storage RH. Mechanical tests, however, revealed a reduced load-bearing capacity of the manufactured PLA specimens. Flexural strength decreased from 103.0 to 99.6 MPa, and the impact strength dropped from 18.2 to 16.2 kJ/m2, which is ascribed to the increasing size of pores inside the specimens with increasing storage RH. These findings should be taken into account when designing and processing PLA products by MEX-based additive manufacturing.},
	year = {2024},
	eissn = {2590-1230},
	orcid-numbers = {Lendvai, László/0000-0003-3670-327X; Fekete, Imre/0000-0003-1835-7000; Jakab, Sándor Kálmán/0009-0009-9688-6304}
}

@article{MTMT:35503978,
	title = {Foam Injection Molding of Poly(Lactic Acid) with Azodicarbonamide-Based Chemical Blowing Agent},
	url = {https://m2.mtmt.hu/api/publication/35503978},
	author = {Lendvai, László and Dogossy, Gábor and Jakab, Sándor Kálmán and Fekete, Imre},
	doi = {10.3390/engproc2024079044},
	journal-iso = {ENGENG PROC},
	journal = {ENGINEERING PROCEEDINGS},
	volume = {79},
	unique-id = {35503978},
	year = {2024},
	eissn = {2673-4591},
	orcid-numbers = {Lendvai, László/0000-0003-3670-327X; Dogossy, Gábor/0000-0003-2907-0734; Jakab, Sándor Kálmán/0009-0009-9688-6304}
}