@article{MTMT:34565460, title = {A comparative machinability analysis of polyimine vitrimer, epoxy and polycarbonate polymers through orthogonal machining experiments}, url = {https://m2.mtmt.hu/api/publication/34565460}, author = {Poór, Dániel István and Tobey, Marina and Taynton, Philip and Pomázi, Ákos and Toldy, Andrea and Geier, Norbert}, doi = {10.1007/s00170-024-13087-9}, journal-iso = {INT J ADV MANUFACT TECHNOL}, journal = {INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY}, volume = {131}, unique-id = {34565460}, issn = {0268-3768}, abstract = {End-of-life management of fibre-reinforced thermoset composites is challenging due to the difficult-to-recycle reinforcements and the irreversibly polymerised thermoset matrix; therefore, researchers proposed the vitrimers as a sustainable alternative to thermosetting polymers. Although the early results of the material scientists are promising, the machinability of vitrimers has yet to be explored. Therefore, this paper aims to present a comparative machinability study of polyimine vitrimer, pentaerythritol-based epoxy (PER) and polycarbonate polymers through orthogonal machining experiments. Reflecting on the temperature-dependent properties of vitrimers, the starting temperature of the cutting tool was varied between room temperature and an elevated temperature above 155 °C. The cutting tool was heated by a 2000-W hot air gun until the surface temperature of the cutting tool, monitored by a VariocamHD thermographic IR camera (with Jenoptik IR 1.0/60 LW lens) and checked by a Fluke 51 II thermometer with a type K thermocouple, was permanently above 155 °C for 5 min. The cutting force was measured by a Kistler 9257B dynamometer, and the machined surface was characterised by a Mitutoyo Surftest SJ-400 surface roughness tester and Keyence VHX-5000 (with VH-Z20UT VH lens) microscope. The analysis of variances (ANOVA) results show that the sustainable vitrimer polymer is an appropriate substitute for thermosetting epoxy polymers, especially at low cutting temperatures.}, year = {2024}, eissn = {1433-3015}, pages = {1361-1376}, orcid-numbers = {Poór, Dániel István/0000-0002-8036-7966; Pomázi, Ákos/0000-0003-2969-8679; Toldy, Andrea/0000-0003-3569-1828; Geier, Norbert/0000-0001-7937-7246} } @article{MTMT:34186019, title = {A review on advanced cutting tools and technologies for edge trimming of carbon fibre reinforced polymer (CFRP) composites}, url = {https://m2.mtmt.hu/api/publication/34186019}, author = {Geier, Norbert and Xu, Jinyang and Poór, Dániel István and Dege, Jan Hendrik and Davim, J Paulo}, doi = {10.1016/j.compositesb.2023.111037}, journal-iso = {COMPOS PART B-ENG}, journal = {COMPOSITES PART B-ENGINEERING}, volume = {266}, unique-id = {34186019}, issn = {1359-8368}, year = {2023}, eissn = {1879-1069}, orcid-numbers = {Geier, Norbert/0000-0001-7937-7246; Xu, Jinyang/0000-0001-7364-9837; Poór, Dániel István/0000-0002-8036-7966; Dege, Jan Hendrik/0000-0001-6341-2692} } @article{MTMT:34068311, title = {Impact assessment of fillers on the machinability of carbon fibre reinforced polymer composites}, url = {https://m2.mtmt.hu/api/publication/34068311}, author = {Magyar, Gergely and Poór, Dániel István and Lukács, Tamás and Tamás-Bényei, Péter and Geier, Norbert}, doi = {10.1016/j.procir.2023.06.143}, journal-iso = {PROCEDIA CIRP}, journal = {PROCEDIA CIRP}, volume = {118}, unique-id = {34068311}, abstract = {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.}, keywords = {Cutting; carbon fibers; SEM; Cutting forces; Fillers; Filled polymers; Micro geometry; Carbon fiber reinforced plastics; Drilling; Impact assessments; Filler; Cutting force; CFRP; Carbon fiber reinforced polymer composite; Analysis of variance (ANOVA); Infill drilling; polymer structure; carbon fillers; Carbon fibre reinforced polymer; Mechanical machining; Milled carbon}, year = {2023}, eissn = {2212-8271}, pages = {833-838}, orcid-numbers = {Poór, Dániel István/0000-0002-8036-7966; Tamás-Bényei, Péter/0000-0002-0001-3544; Geier, Norbert/0000-0001-7937-7246} } @article{MTMT:34068277, title = {Drilling-induced delamination measurement using a novel digital image processing algorithm}, url = {https://m2.mtmt.hu/api/publication/34068277}, author = {Lukács, Tamás and Pereszlai, Csongor and Magyar, Gergely and Geier, Norbert}, doi = {10.1016/j.procir.2023.06.142}, journal-iso = {PROCEDIA CIRP}, journal = {PROCEDIA CIRP}, volume = {118}, unique-id = {34068277}, year = {2023}, eissn = {2212-8271}, pages = {828-832}, orcid-numbers = {Pereszlai, Csongor/0000-0002-2336-6457; Geier, Norbert/0000-0001-7937-7246} } @article{MTMT:34004070, title = {Corrigendum to “A critical review on mechanical micro-drilling of glass and carbon fibre reinforced polymer (GFRP and CFRP) composites” [Compos B: Eng 254 (2023) 110589]}, url = {https://m2.mtmt.hu/api/publication/34004070}, author = {Geier, Norbert and Patra, K. and Anand, R.S. and Ashworth, S. and Balázs, Barnabás Zoltán and Lukács, Tamás and Magyar, Gergely and Tamás-Bényei, Péter and Xu, J. and Davim, J.P.}, doi = {10.1016/j.compositesb.2023.110811}, journal-iso = {COMPOS PART B-ENG}, journal = {COMPOSITES PART B-ENGINEERING}, volume = {262}, unique-id = {34004070}, issn = {1359-8368}, keywords = {Engineering, Multidisciplinary}, year = {2023}, eissn = {1879-1069}, orcid-numbers = {Geier, Norbert/0000-0001-7937-7246; Balázs, Barnabás Zoltán/0000-0001-5235-1388; Tamás-Bényei, Péter/0000-0002-0001-3544} } @article{MTMT:33862475, title = {Analysis and modelling of thrust force in drilling of basalt and carbon fibre-reinforced polymer (BFRP and CFRP) composites}, url = {https://m2.mtmt.hu/api/publication/33862475}, author = {Magyar, Gergely and Geier, Norbert}, doi = {10.1007/s40430-023-04241-7}, journal-iso = {J BRAZ SOC MECH SCI}, journal = {JOURNAL OF THE BRAZILIAN SOCIETY OF MECHANICAL SCIENCES AND ENGINEERING}, volume = {45}, unique-id = {33862475}, issn = {1678-5878}, abstract = {Currently, the use of sustainable products and technologies is growing; consequently, mineral-origin basalt fibre-reinforced polymer (BFRP) composites are becoming more popular in industries. Although BFRP parts require mechanical drilling operations for manufacturing holes for assembly, many challenges make the drilling process difficult. Considering that the cutting force is one of the main parameters characterising the drilling process, this study aims to analyse the influence of feed (mm/rev) and cutting speed (m/min) on the thrust force and model the thrust force in the drilling of BFRP composites through response surface methodology (RSM) and advanced statistical modelling methods. In order to determine main and interaction effects and to calculate the regression coefficients and model parameters, mechanical drilling experiments were performed, and the thrust force was recorded. The raw force data were processed using fast Fourier transformation-based low-pass filtering, and then the calculated thrust force parameters were evaluated relative to various feeds and cutting speeds. In addition, results were compared with those of carbon fibre-reinforced polymer composites. The results of the validation experiments show that both RSM and advanced statistical models accurately predict the thrust force in BFRPs of 96.74% and 95.01%, respectively. However, the advanced statistical model can describe not only the maximum values of the force but also its characteristics at a coefficient of determination of 0.68.}, year = {2023}, eissn = {1806-3691}, orcid-numbers = {Geier, Norbert/0000-0001-7937-7246} } @article{MTMT:33804397, title = {A review on CFRP drilling: fundamental mechanisms, damage issues, and approaches toward high-quality drilling}, url = {https://m2.mtmt.hu/api/publication/33804397}, author = {Xu, Jinyang and Geier, Norbert and Shen, Jiaxin and Krishnaraj, Vijayan and Samsudeensadham, S.}, doi = {10.1016/j.jmrt.2023.05.023}, journal-iso = {J MATER RES TECHN}, journal = {JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY}, volume = {24}, unique-id = {33804397}, issn = {2238-7854}, year = {2023}, eissn = {2214-0697}, pages = {9677-9707}, orcid-numbers = {Xu, Jinyang/0000-0001-7364-9837; Geier, Norbert/0000-0001-7937-7246} } @CONFERENCE{MTMT:33799847, title = {Szénszállal erősített polimer kompozitok többtengelyes élmarási technológiájának fejlesztése és kísérleti vizsgálata}, url = {https://m2.mtmt.hu/api/publication/33799847}, author = {Tima, Tamás Sándor and Magyar, Gergely and Geier, Norbert}, booktitle = {OGÉT 2023}, unique-id = {33799847}, abstract = {A szénszállal erősített polimer (CFRP) kompozitok élmarásakor több kihívás is felmerül, mint például a jelentős sorja és delamináció képződés. Az iparban speciális geometriájú szerszámok és optimalizált folyamatparaméterek alkalmazásával hozzák létre a megfelelő minőségű CFRP alaksajátosságokat. A kutatásunk fő célja egy olyan többtengelyes élmarási technológia fejlesztése volt, amely hagyományos marószerszám alkalmazásával is megfelelő minőségű alaksajátosságokat képes készíteni. Az újszerű maróciklussal megmunkált élek minőségét hagyományos technológiával készített élek minőségével hasonlítottuk össze. Az élmarási kísérleteket egy egyélű 0°-os horonyszögű tömör keményfém marószerszámmal végeztük el. A forgácsolt éleket egy Olympus SZX16 típusú sztereonmikroszkóppal vizsgáltuk meg, majd digitális képfeldolgozással értékeltük ki a felvételeket. Az eredmények azt mutatják, hogy az új fejlesztésű többtengelyes élmaró technológia releváns alternatívája a speciális geometriájú élmarószerszámmal végzett forgácsolásnak.}, year = {2023}, pages = {466-471}, orcid-numbers = {Geier, Norbert/0000-0001-7937-7246} } @CONFERENCE{MTMT:33799835, title = {Erősítő szénszálcsoportok detektálása digitális képfeldolgozási módszerekkel [Detection of reinforcing carbon fibre groups by digital image processing methods]}, url = {https://m2.mtmt.hu/api/publication/33799835}, author = {Magyar, Gergely and Tima, Tamás Sándor and Geier, Norbert}, booktitle = {OGÉT 2023}, unique-id = {33799835}, abstract = {A szénszálerősített polimer (CFRP) kompozitok forgácsolása során számos olyan jelenség játszik szerepet, melyek az erősítőszálak irányától függenek. A rövid, vágott szálas erősítőstruktúra esetén a szénszálcsoportok pozíciójának meghatározása szükséges. Erre a célra különböző digitális képfeldolgozási (DIP) algoritmusokat fejlesztettünk, melyekkel kontrasztkülönbség alapján meghatározhatók a szénszálcsoportok pozíciói. Az egyes algoritmusokat manuális feldolgozott képekkel összehasonlítva létrehoztunk kvantitatív mérőszámokat, melyekkel az egyes algoritmusok pontossága meghatározható.}, year = {2023}, pages = {346-349}, orcid-numbers = {Geier, Norbert/0000-0001-7937-7246} } @article{MTMT:33714770, title = {An experimental study on the drilling of CFRP sandwich structures with filled and unfilled aramid honeycomb cores}, url = {https://m2.mtmt.hu/api/publication/33714770}, author = {Geier, Norbert}, doi = {10.1007/s40430-023-04138-5}, journal-iso = {J BRAZ SOC MECH SCI}, journal = {JOURNAL OF THE BRAZILIAN SOCIETY OF MECHANICAL SCIENCES AND ENGINEERING}, volume = {45}, unique-id = {33714770}, issn = {1678-5878}, abstract = {Lightweight carbon fibre-reinforced polymer (CFRP) sandwich structures with honeycomb cores have excellent specific bending stiffness and good dimensional stability; therefore, their future applications will extend extensively, despite their difficult-to-manufacture nature. Although the drilling of single CFRP structures has been widely investigated, the published experience of drilling honeycomb cored CFRP sandwich panels is strongly limited. Therefore, the main objective of the present paper is to experimentally analyse the machinability of CFRP sandwich panels with filled and unfilled aramid Cormaster honeycomb cores through the analysis of thrust force, drilling torque and drilling-induced burrs. A twist and a brad and spur drill were used in two sandwich structures at three feed levels for the drilling experiments. The thrust force and drilling torque were measured by a KISTLER dynamometer, and the burrs were processed through digital image processing of optically captured images. The experimental results show that the application of fillers in the honeycomb only slightly decreases the nominal specific stiffness of the CFRP/honeycomb sandwich structures and slightly increases the thrust force; however, a significant improvement is achievable by their application in the drilling-induced burr formation of the honeycomb core.}, year = {2023}, eissn = {1806-3691}, orcid-numbers = {Geier, Norbert/0000-0001-7937-7246} }