TY - JOUR AU - Tóth, Csenge AU - Vas, László Mihály AU - Kovács, Norbert Krisztián TI - Achieving gradual failure under bending by the layering design of 3D printed continuous fiber reinforced composites JF - RESULTS IN ENGINEERING J2 - RESULT ENGIN VL - 22 PY - 2024 PG - 8 SN - 2590-1230 DO - 10.1016/j.rineng.2024.102075 UR - https://m2.mtmt.hu/api/publication/34776073 ID - 34776073 N1 - Department of Polymer Engineering, Faculty of Mechanical Engineering, Budapest University of Technology and Economics, Műegyetem rkp. 3., Budapest, H-1111, Hungary MTA-BME Lendület Lightweight Polymer Composites Research Group, Műegyetem rkp. 3., Budapest, H-1111, Hungary Export Date: 22 April 2024 Correspondence Address: Kovács, N.K.; Department of Polymer Engineering, Műegyetem rkp. 3., Hungary; email: kovacsn@pt.bme.hu LA - English DB - MTMT ER - TY - JOUR AU - Mészáros, László AU - Horváth, A. AU - Vas, László Mihály AU - Petrény, Roland TI - Investigation of the correlations between the microstructure and the tensile properties multi-scale composites with a polylactic acid matrix, reinforced with carbon nanotubes and carbon fibers, with the use of the fiber bundle cell theory JF - COMPOSITES SCIENCE AND TECHNOLOGY J2 - COMPOS SCI TECHNOL VL - 242 PY - 2023 PG - 9 SN - 0266-3538 DO - 10.1016/j.compscitech.2023.110154 UR - https://m2.mtmt.hu/api/publication/34066507 ID - 34066507 N1 - Department of Polymer Engineering, Faculty of Mechanical Engineering, Budapest University of Technology and Economics, Műegyetem Rkp. 3., Budapest, H-1111, Hungary ELKH-BME Research Group for Composite Science and Technology, Műegyetem Rkp. 3., Budapest, H-1111, Hungary Export Date: 21 August 2023 CODEN: CSTCE Correspondence Address: Mészáros, L.; Department of Polymer Engineering, Műegyetem Rkp. 3., Hungary; email: meszaros@pt.bme.hu LA - English DB - MTMT ER - TY - JOUR AU - Horváth, Aurél AU - Petrény, Roland AU - Mészáros, László AU - Vas, László Mihály TI - A szálkötegcella-elmélet alkalmazása szénszállal és szén nanocsővel erősített PLA kompozitok szerkezeti modellezésére JF - POLIMEREK J2 - POLIMEREK VL - 8 PY - 2022 IS - 10 SP - 291 EP - 296 PG - 6 SN - 2415-9492 UR - https://m2.mtmt.hu/api/publication/33642283 ID - 33642283 LA - Hungarian DB - MTMT ER - TY - JOUR AU - Bárány, Tamás AU - Morlin, Bálint AU - Vas, László Mihály TI - The effect of the heat used during composite processing on the mechanical properties of fibrous reinforcement of polypropylene-based single-polymer composites JF - SCIENTIFIC REPORTS J2 - SCI REP VL - 12 PY - 2022 IS - 1 PG - 13 SN - 2045-2322 DO - 10.1038/s41598-022-24764-8 UR - https://m2.mtmt.hu/api/publication/33336542 ID - 33336542 N1 - Funding Agency and Grant Number: Budapest University of Technology and Economics Funding text: Open access funding provided by Budapest University of Technology and Economics. AB - In this study, we investigated the effect of heat treatment on the mechanical properties of high-tenacity polypropylene (PP) fibers. An application field of versatile polypropylene as fibers and tapes is the reinforcement of single-polymer composites. During consolidation at an elevated temperature, typically near the melt temperature of PP, the heat causes molecular relaxation of the strongly oriented molecular chains, which impairs mechanical properties. We investigated the shrinkage of PP single fibers isothermally and anisothermally, and heat-treated PP single fibers and multifilament rovings in a temperature range of 120-190 degrees C for 5-20 min in a constrained and an unconstrained arrangement. The heat-treated fibers and rovings were then tensile tested and their residual mechanical properties were determined and compared to the as-received rovings. We analyzed the tensile characteristics mathematically, applying the statistical fiber-bundle-cell modeling method, and described the measured and averaged stress-strain curves with fitted E-bundles having fibers with nonlinear tensile characteristics. The tensile modulus of the constrained fibers treated for 5 min decreased less in the whole heat treatment temperature range but considerably decreased further with increasing treatment time. Conversely, their tensile strength decreased only slightly, and treatment time had a minor effect up to 180-190 degrees C (above the melting temperature of the fiber). The results proved that constraining is a useful tool for preserving the reinforcing ability of high-tenacity polymer fibers. LA - English DB - MTMT ER - TY - JOUR AU - Vas, László Mihály AU - Gombos, Zoltán AU - Nagy, Veronika AU - Halász, Marianna TI - Tailored saturation functions and its application to liquid uptake processes in fibrous composite reinforcements JF - JOURNAL OF INDUSTRIAL TEXTILES J2 - J IND TEXT VL - 52 PY - 2022 SP - 1 EP - 15 PG - 15 SN - 1528-0837 DO - 10.1177/15280837221118093 UR - https://m2.mtmt.hu/api/publication/33249203 ID - 33249203 N1 - Funding Agency and Grant Number: Hungarian National Research, Development, and Innovation Office (NKFIH) [OTKA K116189]; Hungarian Ministry of Human Capacities (EMMI) Funding text: The author(s) disclosed receipt of the following financial support for the research, authorship, and/or publication of this article: This research was supported by the Hungarian National Research, Development, and Innovation Office (NKFIH) through grant OTKA K116189 and it was connected to the Hungarian Ministry of Human Capacities (EMMI) for funding through the BME Nanonotechnology FIKP grant (BME FIKP-NAT). The liquid absorption tests with the Kruss K12 instrument were carried out in cooperation with the Technical University of Liberec. The authors would like to thank John Summerscales, Plymouth University, for his helpful comments on the draft manuscript. AB - Saturation processes occur in almost every theoretical and practical field, e.g. liquid uptake within fibrous composite reinforcements. These processes require appropriate mathematical functions to model them and use them for design purposes. This includes assessing the saturation level, especially in microfluidic processes of fibrous composite reinforcements. This paper proposes a mathematical approach that uses a simple and well-known saturation function with modification through variable transformations and/or linear combinations. When the initial asymptotic behaviour is numerically known, this modified function provides a tailored and robust approximation of the measured saturation process and makes it possible to assess the asymptotic saturation level as well. A saturation function based on micro-tensiometer measurements and a simple exponential function was applied to validate this method. The mathematical approach was validated by test results based on distilled water uptake in polyester yarns and unsaturated polyester (UP) resin absorption within fibreglass chopped strand mats. In both cases, a good correlation was found between the experimental results and the applied mathematical approach, where the determination coefficients were higher than 0.989. LA - English DB - MTMT ER - TY - JOUR AU - Vas, László Mihály AU - Tamás, Péter AU - Bognár, Eszter AU - Nagy, Péter AU - Késmárszky, Róbert AU - Pap, Károly AU - Szebényi, Gábor TI - Nonlinear fiber-bundle-cells-based phenomenological modeling of human tissue samples JF - BIOMECHANICS AND MODELING IN MECHANOBIOLOGY J2 - BIOMECH MODEL MECHAN VL - 21 PY - 2022 SP - 1803 EP - 1823 PG - 21 SN - 1617-7959 DO - 10.1007/s10237-022-01621-1 UR - https://m2.mtmt.hu/api/publication/33202514 ID - 33202514 N1 - Funding Agency and Grant Number: Hungarian National Research, Development and Innovation Office (NKFIH) [OTKA K 116189, OTKA K 138472]; Higher Education Excellence Program of the Ministry of Human Capacities in the framework of the Nanotechnology research area of the Budapest University of Technology and Economics (BME FIKP-BIO); National Research, Development and Innovation Fund [TUDFO/51757/2019-ITM] Funding text: This work was supported by Hungarian National Research, Development and Innovation Office (NKFIH) through grant OTKA K 116189 and OTKA K 138472, by the Higher Education Excellence Program of the Ministry of Human Capacities in the framework of the Nanotechnology research area of the Budapest University of Technology and Economics (BME FIKP-BIO) and by the National Research, Development and Innovation Fund (TUDFO/51757/2019-ITM, Thematic Excellence Program). AB - Certain assemblies of fibers, called fiber bundles, play a crucial role in the statistical macroscale properties of fibrous structures like natural or artificial materials. Based on the concept of using idealized statistical fiber bundle cells (FBCs) as model elements, the software named FiberSpace was developed by us earlier for the phenomenological modeling of the tensile test process of real fibrous structures. The model fibers of these FBCs had been considered linear elastic, which was suitable for modeling certain textiles and composites. However, the biological tissues are multilevel structures with fiber-like building elements on every structural level where the fiber elements on the dominant level are statistical bundles of elementary fibers. Hence, their modeling required us to introduce model fibers of nonlinear mechanical behavior and derive the proper mathematical formulas for the calculation of the expected tensile force processes of the FBCs. Accordingly, we developed a new version of FiberSpace. The proposed nonlinear FBCs-based modeling method is essentially phenomenological that decomposes the measured and averaged stress–strain curve into the weighted sum of the responses of different idealized nonlinear FBCs. However, this decomposition can give certain information about the fibrous structure and some details of its damage and failure sub-processes. A special application of nonlinear E-bundles, where the measured stress–strain curve is expanded into a product-function series, may give another type of description for the failure process and can be applied to single measurements of structured failure process containing significant peaks and drops as well. The fitted phenomenological FBC models provide a decomposition of the measured force–strain curve, which enables to construct informative damage and failure maps. The applicability of the phenomenological modeling method and the fitting procedure is demonstrated with the tensile test data of some human and animal tissues, such as facial nerves and tendons. 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 - Virág, Ábris Dávid AU - Kara, Yahya AU - Vas, László Mihály AU - Molnár, Kolos TI - Single Polymer Composites Made of Melt-blown PP Mats and the Modelling of the Uniaxial Tensile Behaviour by the Fibre Bundle Cells Method (vol 22, pg 2700, 2021) JF - FIBERS AND POLYMERS J2 - FIBER POLYM VL - 23 PY - 2022 IS - 1 SP - 303 EP - 303 PG - 1 SN - 1229-9197 DO - 10.1007/s12221-022-5138-4 UR - https://m2.mtmt.hu/api/publication/32808024 ID - 32808024 N1 - Department of Polymer Engineering, Faculty of Mechanical Engineering, Budapest University of Technology and Economics, Budapest, H-1111, Hungary MTA-BME Research Group for Composite Science and Technology, Budapest, H-1111, Hungary Export Date: 29 April 2022 Correspondence Address: Molnár, K.; Department of Polymer Engineering, Hungary; email: molnar@pt.bme.hu LA - English DB - MTMT ER - TY - JOUR AU - Virág, Ábris Dávid AU - Vas, László Mihály AU - Molnár, Kolos TI - Modelling the deformation and the failure process of glass woven fabrics based on the fibre-bundle-cells theory JF - ACTA MATERIALIA TRANSYLVANICA (EN) J2 - ACTA MATER TRANSYLV (EN) VL - 4 PY - 2021 IS - 1 SP - 58 EP - 63 PG - 6 SN - 2601-8799 DO - 10.33924/amt-2021-01-10 UR - https://m2.mtmt.hu/api/publication/32196039 ID - 32196039 LA - English DB - MTMT ER - TY - JOUR AU - Virág, Ábris Dávid AU - Vas, László Mihály AU - Molnár, Kolos TI - Üvegszövetek deformációs és tönkremeneteli folyamatának szálkötegcella-elméleten alapuló modellezése JF - ACTA MATERIALIA TRANSYLVANICA (HU) J2 - ACTA MATER TRANSYLV (HU) VL - 4 PY - 2021 IS - 1 SP - 58 EP - 63 PG - 6 SN - 2601-1883 DO - 10.33923/amt-2021-01-10 UR - https://m2.mtmt.hu/api/publication/32195360 ID - 32195360 LA - Hungarian DB - MTMT ER -