TY - JOUR AU - Magyar, Gergely AU - Poór, Dániel István AU - Lukács, Tamás AU - Tamás-Bényei, Péter AU - Geier, Norbert TI - Impact assessment of fillers on the machinability of carbon fibre reinforced polymer composites JF - PROCEDIA CIRP J2 - PROCEDIA CIRP VL - 118 PY - 2023 SP - 833 EP - 838 PG - 6 SN - 2212-8271 DO - 10.1016/j.procir.2023.06.143 UR - https://m2.mtmt.hu/api/publication/34068311 ID - 34068311 N1 - Budapest University of Technology and Economics, Faculty of Mechanical Engineering, Department of Manufacturing Science and Engineering, Muegyetem rakpart 3, Budapest, 1111, Hungary Budapest University of Technology and Economics, Faculty of Mechanical Engineering, Department of Polymer Engineering, Muegyetem rakpart 3, Budapest, 1111, Hungary MTA-BME Research Group for Composite Science and Technology, Muegyetem rkp. 3, Budapest, 1111, Hungary AB - Carbon fibre reinforced polymer (CFRP) composites are widely applied due to their exceptional specific mechanical properties. The mechanical machining of these composites is often required; however, the existing expertise on the machinability of CFRP composites with fillers is deficient. Therefore, the main aim of the present study is to experimentally investigate the machinability of CFRPs with and without milled carbon fillers. Drilling experiments were conducted in different CFRP structures, and the cutting force and microgeometry were analysed through the analysis of variance (ANOVA) technique. The experimental results show that the fillers have a significant influence on the microgeometry. © 2023 Elsevier B.V.. All rights reserved. LA - English DB - MTMT ER - TY - JOUR AU - Hliva, Viktor AU - Szebényi, Gábor TI - Non-Destructive Evaluation and Damage Determination of Fiber-Reinforced Composites by Digital Image Correlation JF - JOURNAL OF NONDESTRUCTIVE EVALUATION J2 - J NONDESTRUCT EVAL VL - 42 PY - 2023 IS - 2 PG - 15 SN - 0195-9298 DO - 10.1007/s10921-023-00957-7 UR - https://m2.mtmt.hu/api/publication/33892620 ID - 33892620 N1 - Funding Agency and Grant Number: NRDI Fund (TKP2020IES); Ministry for Innovation and Technology. NRDI Office [OTKA FK 142540, 2019-1.1.1-PIACI-KFI-2019-00139]; Budapest University of Technology and Economics; [OTKA FK 124352] Funding text: Open access funding provided by Budapest University of Technology and Economics. The research reported in this paper was funded by the following projects: NRDI Fund (TKP2020IES, Grant No. BME-IE-NAT) based on the charter of bolster issued by the NRDI Office under the auspices of the Ministry for Innovation and Technology. NRDI Office (OTKA FK 124352, OTKA FK 142540, 2019-1.1.1-PIACI-KFI-2019-00139). AB - The trend in recent years shows that fiber-reinforced polymer composites (FRPCs) are steadily replacing traditional engineering materials in the aerospace, automotive, and sports equipment industries, where the safety and reliability of structures are of crucial importance. The increasing popularity of FRPCs is explained by their favorable mechanical properties. However, a serious problem of FRPCs is their catastrophic failure under overload and lack of ductile behavior. This issue makes it necessary to develop a non-destructive examination method that can estimate the structural integrity and predict the remaining properties of a composite structure even after its partial damage. In this paper, we propose a Digital Image Correlation (DIC)-based new method, which is able to meet all the requirements of Industry 4.0, thus this method can be automated, is fast, accurate, and excludes the human factor. To prove the efficiency of the proposed, Non-Destructive (NDT)-DIC method, we created specimens with known impact damage, and tested them firstly by infrared thermography to get a basic reference to compare the subsequent results. Then we performed the NDT-DIC tests, where through the practical example, we presented the steps and the logical deduction of the method. Firstly, the test load limit is determined, proven by AE testing to be in the non-destructive range for the examined composite system. In the case of a simple tensile test setup, the obtained result is the principal strain field from which we calculate our indicator, the X value. The X value can indicate the existence of damage by itself, furthermore, a correlation can be established that defines the X value's relationship with the reduction of strength, based on preliminary experiments. The use of the correlation enables a higher level of health monitoring than the use of the DIC method without this information because the effect of a random impact damage is predictable for the given composite. In our case, the correlation is already strong with a 0.1% strain/elongation test load, but when the test load is increased to 0.15%, the coefficient of determination (R-2) slightly increases from 0.979 to 0.997. LA - English DB - MTMT ER - TY - JOUR AU - Vermes, Brúnó AU - Czigány, Tibor TI - Improving the extension–twist coupling performance of practically warpage-free laminates via layup hybridization JF - JOURNAL OF REINFORCED PLASTICS AND COMPOSITES J2 - J REINF PLAST COMP VL - 42 PY - 2023 IS - 3–4 SP - 131 EP - 139 PG - 9 SN - 0731-6844 DO - 10.1177/07316844221102941 UR - https://m2.mtmt.hu/api/publication/33049055 ID - 33049055 N1 - Correspondence Address: Czigany, T.; Department of Polymer Engineering, Hungary; email: czigany@eik.bme.hu AB - This article investigates whether the extension–twist and bend–twist coupling performance of practically warpage-free laminates can be improved by layup hybridization (carbon/epoxy–glass/epoxy hybrids) compared to non-hybrid (mono) laminates. We performed numerical layup search by simulating the thermal warpage, and the bend–twist and extension–twist behaviour of 4096 4-ply layup permutations. The upper limit of allowable manufacturing-induced warpage was based on the ISO2768 standard. The optimal hybrid and mono layups were selected to have the most significant coupling performance within the allowable warpage range. A mono layup achieved the maximum bend–twist performance (which does not require layup asymmetry), but layup hybridization increased the extension–twist performance by more than 30% in the practically warpage-free range. The numerical results were validated through 3D scanning and 3D digital image correlation–aided mechanical tests. We concluded that layup hybridization can significantly improve the extension–twist performance of realistically usable composite laminates with negligible thermal warpage. LA - English DB - MTMT ER - TY - JOUR AU - Virág, Ábris Dávid AU - Molnár, Kolos TI - Analysis of Thermogravimetric and Dynamic Mechanical Properties of PLA/PBS Blends Doped With Zinc Oxide Nanoparticles JF - ACTA MATERIALIA TRANSYLVANICA (EN) J2 - ACTA MATER TRANSYLV (EN) VL - 5 PY - 2022 IS - 1 SP - 45 EP - 51 PG - 7 SN - 2601-8799 DO - 10.33924/amt-2022-01-10 UR - https://m2.mtmt.hu/api/publication/33193566 ID - 33193566 AB - In the present work, PLA-PBS blends of 80/20 weight ratio were doped with zinc oxide (2.5; 5; 7.5 and 10 phr) and the flow, thermogravimetric and thermomechanical behaviour of the resulting blends were investigated. Using capillary plasstometry, thermogravimetry (TGA) and dynamic mechanical analysis (DMA), it was found that the increase in zinc oxide content resulted in an increase in the flow indices (MFI, MVR), as well as in the storage and loss modulus values, and a decrease in the thermal stability and glass transition temperature. LA - English DB - MTMT ER - TY - CHAP AU - Horváth, Aurél AU - Vas, László Mihály AU - Petrény, Roland AU - Mészáros, László ED - Barabás, István TI - Szénszállal és szén nanocsővel erősített polimer kompozitok húzási tulajdonságainak szálkötegcella-elméleten alapuló modellezése T2 - XXX. Nemzetközi Gépészeti Konferencia - OGÉT 2022 PB - Erdélyi Magyar Műszaki Tudományos Társaság (EMT) C1 - Kolozsvár T3 - Nemzetközi Gépészeti Találkozó (OGÉT), ISSN 2068-1267 ; 30. PY - 2022 SP - 438 EP - 441 PG - 4 UR - https://m2.mtmt.hu/api/publication/33108594 ID - 33108594 LA - Hungarian DB - MTMT ER - TY - JOUR AU - Litauszki, Katalin AU - Igriczné, É.K. AU - Pamlényi, Krisztián AU - Szarka, Györgyi Éva AU - Kmetty, Ákos AU - Kovács, Zsolt TI - Controlled Drug Release from Laser Treated Polymeric Carrier JF - JOURNAL OF PHARMACEUTICAL SCIENCES J2 - J PHARM SCI VL - 111 PY - 2022 IS - 12 SP - 3297 EP - 3303 PG - 7 SN - 0022-3549 DO - 10.1016/j.xphs.2022.08.018 UR - https://m2.mtmt.hu/api/publication/33098362 ID - 33098362 AB - In this study, we present the effect of laser treatment on polymeric poly(lactic acid) drug carrier films. Our goal was to demonstrate the control of the drug-release kinetics of a polymeric carrier as a function of total absorbed laser energy. The controlled drug release kinetic was achieved by modifying the amorphous polymeric carrier's molecular weight via low energy density laser-exposure. According to gel permeation chromatography results, the decrease of molecular weight correlates with an increasing laser-shot number and shows a distinct saturation-like behavior. The dissolution test also suggests the presence of such dependency, as the rate and amount of caffeine released from the sample shows an increasing tendency up to 2000 laser shots. This fact proves that the laser treatment modifies the drug release. The approach presented here may complement other methods used for controlled drug release in various medical and pharmacological applications. LA - English DB - MTMT ER - TY - JOUR AU - Kiss, Lóránt AU - Simon, Dániel Ábel AU - Bárány, Tamás AU - Mészáros, László TI - Synergistic effects of gamma pre-irradiation and additional vulcanizing agent in case of ground tire rubber containing vulcanizates JF - RADIATION PHYSICS AND CHEMISTRY: THE JOURNAL FOR RADIATION PHYSICS RADIATION CHEMISTRY AND RADIATION PROCESSING J2 - RADIAT PHYS CHEM VL - 201 PY - 2022 PG - 7 SN - 0969-806X DO - 10.1016/j.radphyschem.2022.110414 UR - https://m2.mtmt.hu/api/publication/33056344 ID - 33056344 N1 - Funding Agency and Grant Number: Ministry of Innovation and Technology of Hungary; National Research, Development and Innovation Office, Hungary [K128268]; Hungarian Academy of Sciences; UNKP-21-5 New National Excellence Program of the Ministry for Innovation and Technology; International Atomic Energy Agency (IAEA) Funding text: The research reported in this paper is part of project no. BME-NVA- 02, implemented with the support provided by the Ministry of Innovation and Technology of Hungary from the National Research, Development and Innovation Fund, financed under the TKP2021 fund- ing scheme. This work was supported by the National Research, Development and Innovation Office, Hungary (K128268) . L?aszlo? Me?sz?aros is thankful for J?anos Bolyai Research Scholarship of the Hungarian Academy of Sciences, and for the UNKP-21-5 New National Excellence Program of the Ministry for Innovation and Technology. The authors also extend their acknowledgment to the International Atomic Energy Agency (IAEA) for financial support under the umbrella of CRP (Coordinated Research Project) . The authors are grateful to Professor Erzse?bet Tak?acs for her valuable advices. AB - In this study, we investigated gamma radiation treated ground tire rubber (GTR) at different doses and measured the soluble content and the cross-link density of the samples. These results have been evaluated with Horikx's diagram. The results showed that at low doses, the selective chain-scission of the sulphur cross-links is dominant; however, at higher doses, the degradation of the polymer backbone comes to the fore. Natural rubber (NR) based mixtures were prepared in an internal mixer using conventional and two-step mixing, then the samples were vulcanized. Synergistic effects were observed when using radiation treatment and two-step mixing, resulting in improved mechanical properties. In materials where only one treatment was applied, the properties did not change significantly. The morphology of the mixtures was observed using scanning electron micrographs, which showed that the GTR could integrate well into the matrix. LA - English DB - MTMT ER - TY - JOUR AU - Temesi, Tamás AU - Czigány, Tibor TI - Laser-joined aluminium–polypropylene sheets: the effect of the surface preparation of aluminium JF - INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY J2 - INT J ADV MANUFACT TECHNOL VL - 121 PY - 2022 IS - 9-10 SP - 6907 EP - 6920 PG - 14 SN - 0268-3768 DO - 10.1007/s00170-022-09790-0 UR - https://m2.mtmt.hu/api/publication/33049043 ID - 33049043 N1 - Export Date: 12 August 2022 CODEN: IJATE Correspondence Address: Czigany, T.; Department of Polymer Engineering, Muegyetem rkp. 3, Hungary; email: czigany@eik.bme.hu AB - The aim of this paper is to determine the effect of aluminium surface preparation on the load-bearing capacity of laser-joined aluminium–polypropylene (Al-PP) specimens. The surface of the aluminium is prepared by chemical cleaning and laser engraving. The effect of pulse frequency, engraving speed and repetition number during laser engraving is investigated on the geometric parameters of the structure (straight groove) created on the surface of AA6082 aluminium alloy. Quasi-static shear testing of Al-PP joints is performed to determine how the amount and distance of the grooves affect the load-bearing capacity of the joints. The highest ultimate shear force (1250 ± 35 N) was achieved when many (21) grooves were formed with a laser engraving frequency of 20 kHz, a slow engraving speed (5 mm s−1) and many engraving repetitions (10) in the aluminium specimen. This corresponds to a shear strength of 3.1 MPa, which is 72.5% of the shear strength of the PP material used. Microscopic evaluation of joint cross-sections confirmed that the molten PP completely filled the grooves on the aluminium surface. LA - English DB - MTMT ER - TY - JOUR AU - Petrovics, Noémi AU - Kirchkeszner, Csaba AU - Tábi, Tamás AU - Magyar, Norbert AU - Kovácsné Székely, Ilona AU - Szabó, Bálint Sámuel AU - Nyiri, Zoltán AU - Eke, Zsuzsanna TI - Effect of temperature and plasticizer content of polypropylene and polylactic acid on migration kinetics into isooctane and 95 v/v% ethanol as alternative fatty food simulants JF - FOOD PACKAGING AND SHELF LIFE J2 - FOOD PACK SHELF LIFE VL - 33 PY - 2022 PG - 10 SN - 2214-2894 DO - 10.1016/j.fpsl.2022.100916 UR - https://m2.mtmt.hu/api/publication/33037316 ID - 33037316 N1 - Funding Agency and Grant Number: Wessling International Research and Educational Center (WIREC); National Research, Development and Innovation Fund of Hungary of the FK18 funding scheme [128440]; National Research, Development and Innovation Office, Hungary [2019-1.1.1-PIACI-KFI-2019-00205, 2019-1.1.1-PIACI-KFI-2019-00335, OTKA FK134336]; NRDI Fund (TKP2020 NC) under Ministry for Innovation and Technology [BME-NCS]; Janos Bolyai Research Scholarship of the Hungarian Academy of Sciences; New National Excellence Program of the Ministry for Innovation and Technology from National Research, and Innovation Fund [UNKP-20-5] Funding text: We are thankful to Wessling International Research and Educational Center (WIREC) for providing financial support, laboratory equipment, and materials for our research. The authors gratefully acknowledge the technician staff of Budapest University of Technology and Economics, Faculty of Mechanical Engineering, Department of Polymer Engineering for the help in manufacturing plastic specimens. We are also thankful to BASF Hungary Ltd. for donating Uvinul 3039 and Tinuvin 900. This research program has been implemented with support provided by the National Research, Development and Innovation Fund of Hungary, financed under Project no. 128440 of the FK18 funding scheme.This work was also supported by the National Research, Development and Innovation Office, Hungary (2019-1.1.1-PIACI-KFI-2019-00205, 2019-1.1.1-PIACI-KFI-2019-00335, OTKA FK134336). The research reported in this paper and carried out at BME has been supported by the NRDI Fund (TKP2020 NC, Grant No. BME-NCS) based on the charter of bolster issued by the NRDI Office under the auspices of the Ministry for Innovation and Technology. This paper was supported by the Janos Bolyai Research Scholarship of the Hungarian Academy of Sciences. The research was supported by the UNKP-20-5 New National Excellence Program of the Ministry for Innovation and Technology from the source of the National Research, and Innovation Fund. AB - Plasticizers are commonly used plastic additives. Deep understanding of their effect on the migration of other substances is essential, especially for food contact materials. The migration kinetics of four stabilizer-type additives from polypropylene (PP) and polylactic acid (PLA) with different tributyl acetyl citrate plasticizer content were investigated. The results confirm that the presence of plasticizer in the plastics enhances swelling, and thus the migration of additives. The plasticizer content is in strong correlation with migration rate for all additives, except for PLA-Irgafos 168 samples. Migration kinetic experiments conducted at different contact temperatures showed that the role of temperature apparently exceeds that of plasticization. Nevertheless, hierarchical cluster analysis revealed similarity in the migration mechanisms of stabilizers from plastics with low plasticizer content at high temperature, to that at low temperature from plastics with high plasticizer content. LA - English DB - MTMT ER - TY - JOUR AU - Varbai, Balázs AU - Katula, Levente AU - Dobránszky, János TI - A hidrogén tárolásának és szállításának lehetőségei JF - ANYAGVIZSGÁLÓK LAPJA J2 - ANYAGVIZSGÁLÓK LAPJA VL - 2022 PY - 2022 IS - 2 SP - 16 EP - 21 PG - 6 SN - 1215-8410 UR - https://m2.mtmt.hu/api/publication/33018363 ID - 33018363 LA - Hungarian DB - MTMT ER -