TY - JOUR AU - Barney, C.W. AU - Berezvai, Szabolcs AU - Chau, A.L. AU - Kwon, Y. AU - Pitenis, A.A. AU - McMeeking, R.M. AU - Valentine, M.T. AU - Helgeson, M.E. TI - Experimental observation of near-wall effects during the puncture of soft solids JF - SOFT MATTER J2 - SOFT MATTER PY - 2024 PG - 8 SN - 1744-683X DO - 10.1039/d3sm01216f UR - https://m2.mtmt.hu/api/publication/34832885 ID - 34832885 N1 - Department of Chemical Engineering, University of California Santa Barbara, Santa Barbara, CA 93106, United States Department of Mechanical Engineering, University of California Santa Barbara, Santa Barbara, CA 93106, United States Department of Applied Mechanics, Faculty of Mechanical Engineering, Budapest University of Technology and Economics, Müegyetem rkp. 3., Budapest, H-1111, Hungary Materials Department, University of California Santa Barbara, Santa Barbara, CA 93106, United States Export Date: 3 May 2024 CODEN: SMOAB Correspondence Address: Valentine, M.T.; Department of Mechanical Engineering, United States; email: mtvale@ucsb.edu Correspondence Address: Helgeson, M.E.; Department of Chemical Engineering, United States; email: helgeson@ucsb.edu AB - Performing conventional mechanical characterization techniques on soft materials can be challenging due to issues such as limited sample volumes and clamping difficulties. Deep indentation and puncture is a promising alternative as it is an information-rich measurement with the potential to be performed in a high-throughput manner. Despite its promise, the method lacks standardized protocols, and open questions remain about its possible limitations. Addressing these shortcomings is vital to ensure consistent methodology, measurements, and interpretation across samples and labs. To fill this gap, we examine the role of finite sample dimensions (and by extension, volume) on measured forces to determine the sample geometry needed to perform and unambiguously interpret puncture tests. Through measurements of puncture on a well-characterized elastomer using systematically varied sample dimensions, we show that the apparent mechanical response of a material is in fact sensitive to near-wall effects, and that additional properties, such as the sliding friction coefficient, can only be extracted in the larger dimension case where such effects are negligible. © 2024 The Royal Society of Chemistry. LA - English DB - MTMT ER - TY - CONF AU - Piri, Barnabás AU - Berezvai, Szabolcs TI - Elliptikus héjak átpattanását meghatározó kritikus paraméterek numerikus és kísérleti vizsgálata T2 - OGÉT 2024 - XXXII. Nemzetközi Gépészeti Konferencia PB - Erdélyi Magyar Műszaki Tudományos Társaság (EMT) T3 - Nemzetközi Gépészeti Találkozó (OGÉT), ISSN 2068-1267 ; 32. PY - 2024 SP - 321 EP - 326 PG - 6 UR - https://m2.mtmt.hu/api/publication/34832711 ID - 34832711 LA - Hungarian DB - MTMT ER - TY - CONF AU - Plavecz, Lambert AU - Karap, Attila AU - Berezvai, Szabolcs TI - Ütközési sokk hatásainak modellezése MEMS szenzorban T2 - OGÉT 2024 - XXXII. Nemzetközi Gépészeti Konferencia PB - Erdélyi Magyar Műszaki Tudományos Társaság (EMT) T3 - Nemzetközi Gépészeti Találkozó (OGÉT), ISSN 2068-1267 ; 32. PY - 2024 SP - 327 EP - 332 PG - 6 UR - https://m2.mtmt.hu/api/publication/34826634 ID - 34826634 AB - Jelen tanulmány részei egy egyszerűsített MEMS gyorsulásmérő szenzor padlóra történő ejtésének végeselemes szimulációja, valamint az ütközés okozta sokk terjedésének és az ütközés szenzorstruktúrára gyakorolt hatásának vizsgálata. A folyamat gyors dinamikája explicit végeselemes szoftver alkalmazását követeli meg. A struktúrára gyakorolt hatást erősen befolyásolja a szenzor ejtésének szöge, a kontaktfelület nagysága és a padló anyaga. A sokk szenzorházon keresztüli terjedésére átviteli függvény illeszthető, amellyel a jelenség gyorsan és egyszerűen modellezhető. LA - Hungarian DB - MTMT ER - TY - JOUR AU - Virág, Lilla AU - Egedy, Attila AU - Varga, Csilla AU - Erdős, Gergely AU - Berezvai, Szabolcs AU - Kovács, László AU - Ulbert, Zsolt TI - Determination of the most significant rubber components influencing the hardness of natural rubber (NR) using various statistical methods JF - HELIYON J2 - HELIYON VL - 10 PY - 2024 IS - 3 PG - 19 SN - 2405-8440 DO - 10.1016/j.heliyon.2024.e25170 UR - https://m2.mtmt.hu/api/publication/34539439 ID - 34539439 N1 - Department of MOL Hydrocarbon and Coal Processing, Research Centre for Biochemical, Environmental and Chemical Engineering, Faculty of Engineering, University of Pannonia, Egyetem Str. 10, Veszprém, H8200, Hungary Department of Process Engineering, Research Centre for Biochemical, Environmental and Chemical Engineering, Faculty of Engineering, University of Pannonia, Egyetem Str. 10, Veszprém, H8200, Hungary Sustainability Solutions Research Lab, Research Centre for Biochemical, Environmental and Chemical Engineering, Faculty of Engineering, University of Pannonia, Egyetem Str. 10, Veszprém, H8200, Hungary ECon Engineering Kft, Kondorosi út 3, Budapest, H1116, Hungary Department of Applied Mechanics, Faculty of Mechanical Engineering, Budapest University of Technology and Economics, Műegyetem rkp. 3., Budapest, H-1111, Hungary Export Date: 18 March 2024 Correspondence Address: Virág, L.; Department of MOL Hydrocarbon and Coal Processing, Egyetem Str. 10, Hungary; email: virag.lilla@mk.uni-pannon.hu LA - English DB - MTMT ER - TY - CHAP AU - Berezvai, Szabolcs AU - Köpeczi-Bócz, Ákos Tamás AU - Sipos, B. AU - Szilágyi, Brigitta ED - Reilly, G. ED - Murphy, M. ED - Nagy, B.V. ED - Jarvinen, H.M. TI - Changes In First-Year Engineering Students' Performance In Mathematics And Engineering Subjects At Different Stages Of Distance Learning T2 - Proceedings of the 51st Annual Conference of the European Society for Engineering Education, SEFI 2023 PB - European Society for Engineering Education (SEFI) CY - Brüsszel SN - 9782873520267 PY - 2023 SP - 183 EP - 191 PG - 9 DO - 10.21427/CDZ5-E329 UR - https://m2.mtmt.hu/api/publication/34470974 ID - 34470974 N1 - Dassault Systemes; Engineers Ireland; MathWorks; Siemens Budapest University of Technology and Economics, Budapest, Hungary MTA-ELTE Theory of Learning Mathematics Research Group, Hungary Corvinus University of Budapest, Hungary Conference code: 194746 Export Date: 2 January 2024 Correspondence Address: Berezvai, S.; Budapest University of Technology and EconomicsHungary; email: berezvai@mm.bme.hu AB - Covid pandemic was unprecedented in modern education but is not expected to be unique, therefore increased attention should be paid to accurately analyse its effects on education. Calculus is an important undergraduate mathematics course in engineering programmes, which gives the foundation for engineering subjects like mechanics or electronics. Unfortunately, recent experiences show that the performance of students admitting after the pandemic has deteriorated dramatically in recent years. This research aims to analyse the changes in performance and attitudes of first-year students in the aftermath of the pandemic. In our research, we investigated the performance and learning habits of three groups of first-year mechatronics and energy engineering students during Calculus-1 and the related Mechanics subject. The “2018 group” studied maths traditionally, whereas the “2020 group” took online education in the last months of high school and the first year of university. The “2022 group” spent two years of high school at home in remote learning (the significant 10-11th grades, for maths competence), but received in-person education at the university. Learning habit and performance of the students were monitored using EduBase online educational platform. The results of both the qualitative and quantitative analysis have revealed that online education during the pandemic changed the learning habits of the group in 2020 and had only slight effects on their performance in Calculus and Statics. However, for group 2022, where the pandemic affected high-school maths studies, the performance at the university has fallen dramatically resulting in an increased drop-out rate after the first semester. © 2023 SEFI 2023 - 51st Annual Conference of the European Society for Engineering Education: Engineering Education for Sustainability, Proceedings. All Rights Reserved. LA - English DB - MTMT ER - TY - CHAP AU - Aninger, András AU - Kovács, Péter AU - Németh, Zsolt AU - Erdős, Gergely AU - Kovács, László AU - Varga, Csilla AU - Egedy, Attila AU - Szász, Marcell AU - Berezvai, Szabolcs ED - Kossa, Attila TI - Numerical investigation of the relation of Shore A hardness and hyperelastic parameters for different types of rubbers T2 - Book of Abstracts. 39th Danubia-Adria Symposium on Advances in Experimental Mechanics. 2023 Hungary PB - Gépipari Tudományos Egyesület (GTE) CY - Siófok SN - 9789634219279 PY - 2023 SP - 128 EP - 129 PG - 2 UR - https://m2.mtmt.hu/api/publication/34175087 ID - 34175087 LA - English DB - MTMT ER - TY - CHAP AU - Berezvai, Szabolcs AU - Barney, Christopher AU - McMeeking, Robert M. AU - Helgeson, Matthew E. AU - Valentine, Megan T. ED - Kossa, Attila TI - Applicability of CEL method for the numerical analysis of indentation of soft gels T2 - Book of Abstracts. 39th Danubia-Adria Symposium on Advances in Experimental Mechanics. 2023 Hungary PB - Gépipari Tudományos Egyesület (GTE) CY - Siófok SN - 9789634219279 PY - 2023 SP - 122 EP - 123 PG - 2 UR - https://m2.mtmt.hu/api/publication/34175082 ID - 34175082 LA - English DB - MTMT ER - TY - CHAP AU - Piri, Barnabás AU - Berezvai, Szabolcs ED - Kossa, Attila TI - Experimental and numerical investigation of elliptical shell snap-through T2 - Book of Abstracts. 39th Danubia-Adria Symposium on Advances in Experimental Mechanics. 2023 Hungary PB - Gépipari Tudományos Egyesület (GTE) CY - Siófok SN - 9789634219279 PY - 2023 SP - 24 EP - 25 PG - 2 UR - https://m2.mtmt.hu/api/publication/34175075 ID - 34175075 LA - English DB - MTMT ER - TY - CHAP AU - Berezvai, Szabolcs ED - Baksa, Attila ED - Bertóti, Edgár ED - Kiss, László Péter TI - Hogyan teljesít a mechanika alaptárgyakon egy chatbot? T2 - XIV. Magyar Mechanikai Konferencia, Az előadások összefoglalói PB - Miskolci Egyetem, Gépészmérnöki és Informatikai Kar CY - Miskolc-Egyetemváros SN - 9789633583012 PY - 2023 SP - 1 PG - 1 UR - https://m2.mtmt.hu/api/publication/34122037 ID - 34122037 LA - Hungarian DB - MTMT ER - TY - CHAP AU - Berezvai, Szabolcs AU - McMeeking, Robert M. ED - Baksa, Attila ED - Bertóti, Edgár ED - Kiss, László Péter TI - Prony-sor alapú numerikus inverziós módszer viszkoelasztikus anyagok leírásához T2 - XIV. Magyar Mechanikai Konferencia, Az előadások összefoglalói PB - Miskolci Egyetem, Gépészmérnöki és Informatikai Kar CY - Miskolc-Egyetemváros SN - 9789633583012 PY - 2023 SP - 1 PG - 1 UR - https://m2.mtmt.hu/api/publication/34122021 ID - 34122021 LA - Hungarian DB - MTMT ER -