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[nazev_en] => 24th International Conference on Wear of Materials
[popis_en] => The 24th International Conference on Wear of Materials is a prestigious, long-established conference which provides a unique international forum for researchers and practicing engineers from different disciplines to interact and exchange their latest results. The conference will focus on advances in the understanding of both the fundamental and applied aspects of wear and friction of materials. It is unique for its paper submission process with full peer review in collaboration with the Elsevier journal Wear to ensure the technical quality of presentations.
[klicova_slova_en] => Biotribology, Ceramics and CMCs, Extreme Environment Wear including High and Low Temperatures and Vacuum, Fretting Wear, Lubricated Wear, Metals and MMCs, Polymers and PMCs, Friction Materials, Emerging topics
[vysledek_datum] => 2023-04-16T00:00:00+02:00
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[nazev] => Dynamic Fracture Characteristics of High-Strength Steel
[nazev_orig] => Dynamic Fracture Characteristics of High-Strength Steel
[duvernost_udaju_id] => S
[popis] => The absorbed impact energy KV and the dynamic fracture toughness KId of the low-alloyed steel OCHN3MFA were measured in the respective temperature ranges 〈–40, 90〉 and 〈–60, –20〉 °C. The values of impact energy in the range of 〈14.1, 21.3〉 J were obtained using Charpy V-notch samples after subtracting parasitic energies (friction in bearings, etc.). All these values corresponded to an extended transition region since the temperature –40 °C was still higher than the lower shelf impact-energy (shear lips present) and the temperature 90 °C was lower than the upper shelf (only 20 % of ductile morphology). Dynamic fracture toughness was determined using Charpy V-notch samples with fatigue pre-cracks. The relatedKId-values were obtained in the range〈55.8, 77.5〉 MPa.m1/2. They were found to be valid linear-elastic fracture toughness and were somewhat higher than the previously reported static KIc-values. The study revealed that OCHN3MFA steel has sufficient resistance to dynamic fracture, particularly at low temperatures
[popis_orig] => The absorbed impact energy KV and the dynamic fracture toughness KId of the low-alloyed steel OCHN3MFA were measured in the respective temperature ranges 〈–40, 90〉 and 〈–60, –20〉 °C. The values of impact energy in the range of 〈14.1, 21.3〉 J were obtained using Charpy V-notch samples after subtracting parasitic energies (friction in bearings, etc.). All these values corresponded to an extended transition region since the temperature –40 °C was still higher than the lower shelf impact-energy (shear lips present) and the temperature 90 °C was lower than the upper shelf (only 20 % of ductile morphology). Dynamic fracture toughness was determined using Charpy V-notch samples with fatigue pre-cracks. The relatedKId-values were obtained in the range〈55.8, 77.5〉 MPa.m1/2. They were found to be valid linear-elastic fracture toughness and were somewhat higher than the previously reported static KIc-values. The study revealed that OCHN3MFA steel has sufficient resistance to dynamic fracture, particularly at low temperatures
[klicova_slova] => absorbed impact energy; dynamic fracture toughness; high-strength steel; transition range; fracture surface morphology
[klicova_slova_orig] => absorbed impact energy; dynamic fracture toughness; high-strength steel; transition range; fracture surface morphology
[url] => https://www.scientific.net/DDF.422.45.pdf
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[vycet_osob] => KIANICOVÁ, M.; DLOUHÝ, I.; ŠANDERA, P.; HORNÍKOVÁ, J.; POKLUDA, J.
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[druh_nazev] => Scopus Article
[druh_popis] => Peer-reviewed article included in Scopus database as an “Article”, “Review” or “Letter”
[stav] => Approved
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[citace_text] => KIANICOVÁ, M.; DLOUHÝ, I.; ŠANDERA, P.; HORNÍKOVÁ, J.; POKLUDA, J. Dynamic Fracture Characteristics of High-Strength Steel. Defect and Diffusion Forum, 2023, vol. 422, no. 1, p. 45-49. ISSN: 1012-0386.
[citace_html] => KIANICOVÁ, M.; DLOUHÝ, I.; ŠANDERA, P.; HORNÍKOVÁ, J.; POKLUDA, J. Dynamic Fracture Characteristics of High-Strength Steel. Defect and Diffusion Forum, 2023, vol. 422, no. 1, p. 45-49. ISSN: 1012-0386.
[citace_rtf] =>
[citace_bibtex] => @article{BUT183139,
author="Marta {Kianicová} and Ivo {Dlouhý} and Pavel {Šandera} and Jana {Horníková} and Jaroslav {Pokluda}",
title="Dynamic Fracture Characteristics of High-Strength Steel",
journal="Defect and Diffusion Forum",
year="2023",
volume="422",
number="1",
pages="45--49",
doi="10.4028/p-psqq46",
issn="1012-0386",
url="https://www.scientific.net/DDF.422.45.pdf"
}
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[nazev_en] => Dynamic Fracture Characteristics of High-Strength Steel
[popis_en] => The absorbed impact energy KV and the dynamic fracture toughness KId of the low-alloyed steel OCHN3MFA were measured in the respective temperature ranges 〈–40, 90〉 and 〈–60, –20〉 °C. The values of impact energy in the range of 〈14.1, 21.3〉 J were obtained using Charpy V-notch samples after subtracting parasitic energies (friction in bearings, etc.). All these values corresponded to an extended transition region since the temperature –40 °C was still higher than the lower shelf impact-energy (shear lips present) and the temperature 90 °C was lower than the upper shelf (only 20 % of ductile morphology). Dynamic fracture toughness was determined using Charpy V-notch samples with fatigue pre-cracks. The relatedKId-values were obtained in the range〈55.8, 77.5〉 MPa.m1/2. They were found to be valid linear-elastic fracture toughness and were somewhat higher than the previously reported static KIc-values. The study revealed that OCHN3MFA steel has sufficient resistance to dynamic fracture, particularly at low temperatures
[klicova_slova_en] => absorbed impact energy; dynamic fracture toughness; high-strength steel; transition range; fracture surface morphology
[vysledek_datum] => 2023-03-24T00:00:00+01:00
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[nazev] => Elektrický ovladač dveří
[nazev_orig] => Elektrický ovladač dveří
[duvernost_udaju_id] => C
[popis] => Elektrický ovladač dveří
Technické řešení se týká ovladače dveří s otočně zdvihacím mechanismem, který slouží jako akční člen dveří silničních vozidel zejména hromadné dopravy osob a je opatřen elektrickým pohonem.
[popis_orig] => Elektrický ovladač dveří
Technické řešení se týká ovladače dveří s otočně zdvihacím mechanismem, který slouží jako akční člen dveří silničních vozidel zejména hromadné dopravy osob a je opatřen elektrickým pohonem.
[klicova_slova] => Ovladač dveří, autobus
[klicova_slova_orig] => Ovladač dveří, autobus
[url] =>
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[citace_text] => PETRUŠKA, J.; PAVLIŠ, J.; BALCAR, M.; Poličské strojírny a. s., Bořiny 1145, 572 01 Polička, Horní Předměstí, Česká republika Vysoké učení technické v Brně, Antonínská 548/1, 602 00 Brno, Veveří, Česká republika: Elektrický ovladač dveří. 36698, Užitný vzor. (2022)
[citace_html] => PETRUŠKA, J.; PAVLIŠ, J.; BALCAR, M.; Poličské strojírny a. s., Bořiny 1145, 572 01 Polička, Horní Předměstí, Česká republika Vysoké učení technické v Brně, Antonínská 548/1, 602 00 Brno, Veveří, Česká republika: Elektrický ovladač dveří. 36698, Užitný vzor. (2022)
[citace_rtf] =>
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author="Jindřich {Petruška} and Jakub {Pavliš} and Miroslav {Balcar}",
title="Elektrický ovladač dveří",
year="2022",
note="Utility model"
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[poznamka_metriky] =>
[nazev_en] => Electric door operator
[popis_en] => Electric door operator
The technical solution concerns a door controller with a rotating lifting mechanism, which serves as an actuator for the doors of road vehicles, especially mass transport of people, and is equipped with an electric drive.
[klicova_slova_en] => Door operator, bus
[vysledek_datum] => 2022-12-16T00:00:00+01:00
)
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(
[vysledek_id] => 183226
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[nazev] => Elektrický ovladač dveří
[nazev_orig] => Elektrický ovladač dveří
[duvernost_udaju_id] => C
[popis] => Prototyp "Elektrická pohonná jednotka pro ovládání dveří autobusů". Plně funkční, v laboratorních i provozních podmínkách otestovaný prototyp s prokázanými parametry a užitnými vlastnostmi, nákladově vyhovující pro dosažení potřebných ekonomických přínosů.
[popis_orig] => Prototyp "Elektrická pohonná jednotka pro ovládání dveří autobusů". Plně funkční, v laboratorních i provozních podmínkách otestovaný prototyp s prokázanými parametry a užitnými vlastnostmi, nákladově vyhovující pro dosažení potřebných ekonomických přínosů.
[klicova_slova] => Elektrická pohonná jednotka; dveře autobusu
[klicova_slova_orig] => Elektrická pohonná jednotka; dveře autobusu
[url] =>
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[citace_text] => PETRUŠKA, J.; PAVLIŠ, J.; BALCAR, M.: Elektrický ovladač dveří. (Prototyp)
[citace_html] => PETRUŠKA, J.; PAVLIŠ, J.; BALCAR, M.: Elektrický ovladač dveří. (Prototyp)
[citace_rtf] =>
[citace_bibtex] => @misc{BUT183226,
author="Jindřich {Petruška} and Jakub {Pavliš} and Miroslav {Balcar}",
title="Elektrický ovladač dveří",
year="2022",
note="Prototype"
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[poznamka_metriky] =>
[nazev_en] => Electric door operator
[popis_en] => Prototype "Electric drive unit for bus door control". A fully functional prototype tested in laboratory and operating conditions with proven parameters and useful properties, cost-effective to achieve the necessary economic benefits.
[klicova_slova_en] => Electric drive unit; bus door;
[vysledek_datum] => 2022-12-30T00:00:00+01:00
)
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[nazev] => Clinical outcomes and survival comparison between NexGen all‑poly and its metal‑backed equivalent in total knee arthroplasty
[nazev_orig] => Clinical outcomes and survival comparison between NexGen all‑poly and its metal‑backed equivalent in total knee arthroplasty
[duvernost_udaju_id] => S
[popis] => PurposeThis study aims to compare total knee replacement (TKA) with NexGen All-Poly (APT) and NexGen Metal-Backed (MBT) in terms of implant survivorship, reasons leading to implant failure and functional results of defined age categories.MethodsA single-centre, retrospective evaluation of 812 patients who underwent knee replacement with NexGen CR between 2005 and 2021, comparing a modern congruent APT component to a modular MBT equivalent component using a similar surgical technique at a notable mean follow-up duration. Implant survival, functional outcomes using the Knee Society Score and range of motion were evaluated and compared in different age categories.ResultsOf the 812 NexGen CR TKAs performed at our institution, 410 (50.4%) used APT components and 402 (49.6%) MBT components. The survival rate of NexGen APT was 97.1% and that of NexGen MBT was 93.2% (p = 0.36). Removal of the implant occurred overall in 15 cases, for MBT in ten cases, and for APT in four cases. The FS was proved to be significantly higher when APT components were implanted in younger patients than for MBT (p = 0.005). A similar range of motion between the components was recorded (p = 0.1926).ConclusionUnder defined conditions, we measured the clinical results of implants from a single manufacturer implanted in a single department using a similar surgical technique. Considering the limitations, we suggest that all-polyethylene tibial components are equal or even superior to metal-backed ones across the examined age categories.
[popis_orig] => PurposeThis study aims to compare total knee replacement (TKA) with NexGen All-Poly (APT) and NexGen Metal-Backed (MBT) in terms of implant survivorship, reasons leading to implant failure and functional results of defined age categories.MethodsA single-centre, retrospective evaluation of 812 patients who underwent knee replacement with NexGen CR between 2005 and 2021, comparing a modern congruent APT component to a modular MBT equivalent component using a similar surgical technique at a notable mean follow-up duration. Implant survival, functional outcomes using the Knee Society Score and range of motion were evaluated and compared in different age categories.ResultsOf the 812 NexGen CR TKAs performed at our institution, 410 (50.4%) used APT components and 402 (49.6%) MBT components. The survival rate of NexGen APT was 97.1% and that of NexGen MBT was 93.2% (p = 0.36). Removal of the implant occurred overall in 15 cases, for MBT in ten cases, and for APT in four cases. The FS was proved to be significantly higher when APT components were implanted in younger patients than for MBT (p = 0.005). A similar range of motion between the components was recorded (p = 0.1926).ConclusionUnder defined conditions, we measured the clinical results of implants from a single manufacturer implanted in a single department using a similar surgical technique. Considering the limitations, we suggest that all-polyethylene tibial components are equal or even superior to metal-backed ones across the examined age categories.
[klicova_slova] => Knee arthroplasty;All-polyethylene knee replacement;NexGen;Implant survival;Knee Society Score
[klicova_slova_orig] => Knee arthroplasty;All-polyethylene knee replacement;NexGen;Implant survival;Knee Society Score
[url] => https://link.springer.com/article/10.1007/s00264-023-05772-3
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[citace_text] => APOSTOLOPOULOS, V.; NACHTNEBL, L.; MAHDAL, M.; PAZOUREK, L.; BOHÁČ, P.; JANÍČEK, P.; TOMÁŠ, T. Clinical outcomes and survival comparison between NexGen all‑poly and its metal‑backed equivalent in total knee arthroplasty. INTERNATIONAL ORTHOPAEDICS, 2023, vol. 47, no. 4, p. 2207-2213. ISSN: 1432-5195.
[citace_html] => APOSTOLOPOULOS, V.; NACHTNEBL, L.; MAHDAL, M.; PAZOUREK, L.; BOHÁČ, P.; JANÍČEK, P.; TOMÁŠ, T. Clinical outcomes and survival comparison between NexGen all‑poly and its metal‑backed equivalent in total knee arthroplasty. INTERNATIONAL ORTHOPAEDICS, 2023, vol. 47, no. 4, p. 2207-2213. ISSN: 1432-5195.
[citace_rtf] =>
[citace_bibtex] => @article{BUT183384,
author="Vasileios {Apostolopoulos} and Luboš {Nachtnebl} and Michal {Mahdal} and Lukáš {Pazourek} and Petr {Boháč} and Pavel {Janíček} and Tomáš {Tomáš}",
title="Clinical outcomes and survival comparison between NexGen all‑poly and its metal‑backed equivalent in total knee arthroplasty",
journal="INTERNATIONAL ORTHOPAEDICS",
year="2023",
volume="47",
number="4",
pages="2207--2213",
doi="10.1007/s00264-023-05772-3",
issn="0341-2695",
url="https://link.springer.com/article/10.1007/s00264-023-05772-3"
}
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[nazev_en] => Clinical outcomes and survival comparison between NexGen all‑poly and its metal‑backed equivalent in total knee arthroplasty
[popis_en] => PurposeThis study aims to compare total knee replacement (TKA) with NexGen All-Poly (APT) and NexGen Metal-Backed (MBT) in terms of implant survivorship, reasons leading to implant failure and functional results of defined age categories.MethodsA single-centre, retrospective evaluation of 812 patients who underwent knee replacement with NexGen CR between 2005 and 2021, comparing a modern congruent APT component to a modular MBT equivalent component using a similar surgical technique at a notable mean follow-up duration. Implant survival, functional outcomes using the Knee Society Score and range of motion were evaluated and compared in different age categories.ResultsOf the 812 NexGen CR TKAs performed at our institution, 410 (50.4%) used APT components and 402 (49.6%) MBT components. The survival rate of NexGen APT was 97.1% and that of NexGen MBT was 93.2% (p = 0.36). Removal of the implant occurred overall in 15 cases, for MBT in ten cases, and for APT in four cases. The FS was proved to be significantly higher when APT components were implanted in younger patients than for MBT (p = 0.005). A similar range of motion between the components was recorded (p = 0.1926).ConclusionUnder defined conditions, we measured the clinical results of implants from a single manufacturer implanted in a single department using a similar surgical technique. Considering the limitations, we suggest that all-polyethylene tibial components are equal or even superior to metal-backed ones across the examined age categories.
[klicova_slova_en] => Knee arthroplasty;All-polyethylene knee replacement;NexGen;Implant survival;Knee Society Score
[vysledek_datum] => 2023-04-18T00:00:00+02:00
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[nazev] => Prediction of ring crack initiation in ceramics and glasses using a stress-energy fracture criterion
[nazev_orig] => Prediction of ring crack initiation in ceramics and glasses using a stress-energy fracture criterion
[duvernost_udaju_id] => S
[popis] => Crack initiation in brittle materials upon spherical indentation is associated with the tensile radial stresses during loading. However, location of crack onset often differs (offset) from the site of maximal stress. In addition, experiments reveal a strong dependency of crack initiation forces on geometrical parameters as well as the surface condition of the sample. In this work, a coupled stress-energy fracture criterion is introduced to describe the initiation of ring cracks in brittle materials, which takes into account the geometry of the contact and the inherent strength and fracture toughness of the material. Several experiments reported in literature are evaluated and compared. The criterion can explain the location offset of the ring crack upon loading, as observed in various ceramics and glasses. It also predicts the ring crack initiation force upon contact loading, provided that surface compressive stresses, introduced during grinding or polishing processes, are taken into account. Furthermore, the stress-energy criterion may be employed to estimate the surface residual stress of ceramic parts, based on simple contact damage experiments.
[popis_orig] => Crack initiation in brittle materials upon spherical indentation is associated with the tensile radial stresses during loading. However, location of crack onset often differs (offset) from the site of maximal stress. In addition, experiments reveal a strong dependency of crack initiation forces on geometrical parameters as well as the surface condition of the sample. In this work, a coupled stress-energy fracture criterion is introduced to describe the initiation of ring cracks in brittle materials, which takes into account the geometry of the contact and the inherent strength and fracture toughness of the material. Several experiments reported in literature are evaluated and compared. The criterion can explain the location offset of the ring crack upon loading, as observed in various ceramics and glasses. It also predicts the ring crack initiation force upon contact loading, provided that surface compressive stresses, introduced during grinding or polishing processes, are taken into account. Furthermore, the stress-energy criterion may be employed to estimate the surface residual stress of ceramic parts, based on simple contact damage experiments.
[klicova_slova] => brittle fracture; coupled criterion; crack initiation; finite fracture mechanics; ring crack
[klicova_slova_orig] => brittle fracture; coupled criterion; crack initiation; finite fracture mechanics; ring crack
[url] => https://ceramics.onlinelibrary.wiley.com/doi/10.1111/jace.19076
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[citace_text] => PAPŠÍK, R.; ŠEVEČEK, O.; MARTIN, É.; BERMEJO, R. Prediction of ring crack initiation in ceramics and glasses using a stress-energy fracture criterion. Journal of the American Ceramic Society, 2023, vol. 106, no. 7, 14 p. ISSN: 0002-7820.
[citace_html] => PAPŠÍK, R.; ŠEVEČEK, O.; MARTIN, É.; BERMEJO, R. Prediction of ring crack initiation in ceramics and glasses using a stress-energy fracture criterion. Journal of the American Ceramic Society, 2023, vol. 106, no. 7, 14 p. ISSN: 0002-7820.
[citace_rtf] =>
[citace_bibtex] => @article{BUT183389,
author="Roman {Papšík} and Oldřich {Ševeček} and Éric {Martin} and Raul {Bermejo}",
title="Prediction of ring crack initiation in ceramics and glasses using a stress-energy fracture criterion",
journal="Journal of the American Ceramic Society",
year="2023",
volume="106",
number="7",
pages="14",
doi="10.1111/jace.19076",
issn="0002-7820",
url="https://ceramics.onlinelibrary.wiley.com/doi/10.1111/jace.19076"
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[nazev_en] => Prediction of ring crack initiation in ceramics and glasses using a stress-energy fracture criterion
[popis_en] => Crack initiation in brittle materials upon spherical indentation is associated with the tensile radial stresses during loading. However, location of crack onset often differs (offset) from the site of maximal stress. In addition, experiments reveal a strong dependency of crack initiation forces on geometrical parameters as well as the surface condition of the sample. In this work, a coupled stress-energy fracture criterion is introduced to describe the initiation of ring cracks in brittle materials, which takes into account the geometry of the contact and the inherent strength and fracture toughness of the material. Several experiments reported in literature are evaluated and compared. The criterion can explain the location offset of the ring crack upon loading, as observed in various ceramics and glasses. It also predicts the ring crack initiation force upon contact loading, provided that surface compressive stresses, introduced during grinding or polishing processes, are taken into account. Furthermore, the stress-energy criterion may be employed to estimate the surface residual stress of ceramic parts, based on simple contact damage experiments.
[klicova_slova_en] => brittle fracture; coupled criterion; crack initiation; finite fracture mechanics; ring crack
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[nazev] => Experimental validation of the operation of tilting-pad journal bearing lubricated by high-test peroxide under excessive vibrations and reduced flow of the lubricant
[nazev_orig] => Experimental validation of the operation of tilting-pad journal bearing lubricated by high-test peroxide under excessive vibrations and reduced flow of the lubricant
[duvernost_udaju_id] => S
[popis] => Hydrogen peroxide is commonly used as a low-toxicity liquid rocket propellant (oxidizer). Hydrodynamic bearings lubricated by this propellant may be applicable in rocket engine pumps. In this paper, a hydrodynamic tilting-pad journal bearing lubricated by highly concentrated (87wt%) hydrogen peroxide was proposed. Furthermore, an experimental validation of the performance of this bearing with pads made of PEEK material (polyetheretherketone) was carried out on the developed high-speed measuring device. To verify the endurance of this bearing, measurements were performed at different peroxide flow rates from 100% to 20% of the nominal flow rate. The tests were also conducted under excessive vibrations induced by the misalignment of the test rotor with the drive connected by a flexible coupling. In addition to vibration measurement, the wear of the bearing sliding surfaces and lubricant temperature variations were evaluated. The measured results were compared with the calculated data. For this purpose, a two-dimensional computational model based on the thermo-elasto-hydrodynamic lubrication theory was presented. To improve the solution convergence, Newton's method was used to calculate the equilibrium tilt of the pads. The involved bearings operated smoothly at the mentioned misalignment even at 20% peroxide flow, only slight foaming occurred at the outlet.
[popis_orig] => Hydrogen peroxide is commonly used as a low-toxicity liquid rocket propellant (oxidizer). Hydrodynamic bearings lubricated by this propellant may be applicable in rocket engine pumps. In this paper, a hydrodynamic tilting-pad journal bearing lubricated by highly concentrated (87wt%) hydrogen peroxide was proposed. Furthermore, an experimental validation of the performance of this bearing with pads made of PEEK material (polyetheretherketone) was carried out on the developed high-speed measuring device. To verify the endurance of this bearing, measurements were performed at different peroxide flow rates from 100% to 20% of the nominal flow rate. The tests were also conducted under excessive vibrations induced by the misalignment of the test rotor with the drive connected by a flexible coupling. In addition to vibration measurement, the wear of the bearing sliding surfaces and lubricant temperature variations were evaluated. The measured results were compared with the calculated data. For this purpose, a two-dimensional computational model based on the thermo-elasto-hydrodynamic lubrication theory was presented. To improve the solution convergence, Newton's method was used to calculate the equilibrium tilt of the pads. The involved bearings operated smoothly at the mentioned misalignment even at 20% peroxide flow, only slight foaming occurred at the outlet.
[klicova_slova] => Hydrogen peroxide; Tilting pad journal bearing; Measurement; Extreme conditions
[klicova_slova_orig] => Hydrogen peroxide; Tilting pad journal bearing; Measurement; Extreme conditions
[url] => https://www.sciencedirect.com/science/article/pii/S0043164823001849
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[citace_text] => POKORNÝ, J.; NÁVRAT, T.; VAJDÁK, M.; OTEVŘEL, M.; KOZÁK, J. Experimental validation of the operation of tilting-pad journal bearing lubricated by high-test peroxide under excessive vibrations and reduced flow of the lubricant. Wear, 2023, vol. 523, no. 6, 13 p. ISSN: 0043-1648.
[citace_html] => POKORNÝ, J.; NÁVRAT, T.; VAJDÁK, M.; OTEVŘEL, M.; KOZÁK, J. Experimental validation of the operation of tilting-pad journal bearing lubricated by high-test peroxide under excessive vibrations and reduced flow of the lubricant. Wear, 2023, vol. 523, no. 6, 13 p. ISSN: 0043-1648.
[citace_rtf] =>
[citace_bibtex] => @article{BUT183512,
author="Jan {Pokorný} and Tomáš {Návrat} and Michal {Vajdák} and Marek {Otevřel} and Jiří {Kozák}",
title="Experimental validation of the operation of tilting-pad journal bearing lubricated by high-test peroxide under excessive vibrations and reduced flow of the lubricant",
journal="Wear",
year="2023",
volume="523",
number="6",
pages="13",
doi="10.1016/j.wear.2023.204801",
issn="0043-1648",
url="https://www.sciencedirect.com/science/article/pii/S0043164823001849"
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[poznamka_metriky] =>
[nazev_en] => Experimental validation of the operation of tilting-pad journal bearing lubricated by high-test peroxide under excessive vibrations and reduced flow of the lubricant
[popis_en] => Hydrogen peroxide is commonly used as a low-toxicity liquid rocket propellant (oxidizer). Hydrodynamic bearings lubricated by this propellant may be applicable in rocket engine pumps. In this paper, a hydrodynamic tilting-pad journal bearing lubricated by highly concentrated (87wt%) hydrogen peroxide was proposed. Furthermore, an experimental validation of the performance of this bearing with pads made of PEEK material (polyetheretherketone) was carried out on the developed high-speed measuring device. To verify the endurance of this bearing, measurements were performed at different peroxide flow rates from 100% to 20% of the nominal flow rate. The tests were also conducted under excessive vibrations induced by the misalignment of the test rotor with the drive connected by a flexible coupling. In addition to vibration measurement, the wear of the bearing sliding surfaces and lubricant temperature variations were evaluated. The measured results were compared with the calculated data. For this purpose, a two-dimensional computational model based on the thermo-elasto-hydrodynamic lubrication theory was presented. To improve the solution convergence, Newton's method was used to calculate the equilibrium tilt of the pads. The involved bearings operated smoothly at the mentioned misalignment even at 20% peroxide flow, only slight foaming occurred at the outlet.
[klicova_slova_en] => Hydrogen peroxide; Tilting pad journal bearing; Measurement; Extreme conditions
[vysledek_datum] => 2023-03-22T00:00:00+01:00
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[popis] => A three dimensional (3D) finite element (FE) model of a silicone vocal fold (VF) filled with fluid is presented here. The silicone part of the model is based on partial differential equations of the continuum mechanics and consider large deformations. The fluid domain encapsulated in the silicone VF is defined semi-analytically as a lumped-element model describing the fluid in hydrostatic conditions. The elongated and pressurized silicone VF was subjected to perturbed modal analysis. Results showed that the choice of the fluid inside the VF substantially influences the natural frequencies. Namely, the water-filling lowers the natural frequencies approximately by half over the air-filling. Besides, the procedure of reverse engineering for obtaining the geometry of the VF from already 3D-printed mold is introduced.
[popis_orig] => A three dimensional (3D) finite element (FE) model of a silicone vocal fold (VF) filled with fluid is presented here. The silicone part of the model is based on partial differential equations of the continuum mechanics and consider large deformations. The fluid domain encapsulated in the silicone VF is defined semi-analytically as a lumped-element model describing the fluid in hydrostatic conditions. The elongated and pressurized silicone VF was subjected to perturbed modal analysis. Results showed that the choice of the fluid inside the VF substantially influences the natural frequencies. Namely, the water-filling lowers the natural frequencies approximately by half over the air-filling. Besides, the procedure of reverse engineering for obtaining the geometry of the VF from already 3D-printed mold is introduced.
[klicova_slova] => Perturbed Modal Analysis; Finite Element Method; Vocal Folds; Reverse Engineering; Biomechanics of Voice
[klicova_slova_orig] => Perturbed Modal Analysis; Finite Element Method; Vocal Folds; Reverse Engineering; Biomechanics of Voice
[url] => https://doi.org/10.21495/em2023-87
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[citace_text] => HÁJEK, P.; RADOLF, V.; HORÁČEK, J.; ŠVEC, J. Finite Element Modal Analysis of a Silicone Vocal Fold Filled with Fluid. Engineering Mechanics 2023. Engineering Mechanics. Praha: Institute of Thermomechanics of the Czech Academy of Sciences, 2023. no. 1, p. 87-90. ISBN: 978-80-87012-84-0. ISSN: 1805-8248.
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author="Petr {Hájek} and Vojtěch {Radolf} and Jaromír {Horáček} and Jan G. {Švec}",
title="Finite Element Modal Analysis of a Silicone Vocal Fold Filled with Fluid",
booktitle="Engineering Mechanics 2023",
year="2023",
journal="Engineering Mechanics",
volume="29",
number="1",
pages="87--90",
publisher="Institute of Thermomechanics of the Czech Academy of Sciences",
address="Praha",
doi="10.21495/em2023-87",
isbn="978-80-87012-84-0",
issn="1805-8248",
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[nazev_en] => Use of computer-aided design and 3D printing for airway management in paediatric patients with a cleft facial defect: a pilot study
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[nazev] => Influence of flexoelectricity on interface crack problems under a dynamic load
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[duvernost_udaju_id] => S
[popis] => In the present paper, the influence of flexoelectricity on behavior of the interface crack between two dissimilar dielectric materials under a dynamic mechanical load is investigated. The induced electric field affects the distribution and evolution of mechanical fields in dielectric materials. Large strain gradients induce the electric polarization in the direct flexoelectricity. Due to the large strain gradients at the crack tip vicinity it is needed to consider the strain gradient theory model. Governing equations in this theory contain higher-order derivatives than in the conventional continuum mechanics approach. The mixed finite element method (FEM) is developed here for a general boundary value problem, where the standard C0 continuous finite elements are applied for independent approximations of displacements and strains. The constraints between them are satisfied by collocation at appropriate internal points in elements. Interface cracks are observed in layered structures frequently due to a poor adhesion of layers. The incorporation of flexoelectricity and micro-inertial effects is needed into the failure analysis of interface cracks in nano-sized structures under dynamic loading. In numerical examples, we discuss the influence of flexoelectricity coefficients as well as the ratio of elastic coefficients and the geometrical size to microstructural (micro-stiffness and micro-inertia) length scale parameters of the bilayer composite on the crack opening displacement, stresses ahead the crack tip and induced electric intensity vector.
[popis_orig] => In the present paper, the influence of flexoelectricity on behavior of the interface crack between two dissimilar dielectric materials under a dynamic mechanical load is investigated. The induced electric field affects the distribution and evolution of mechanical fields in dielectric materials. Large strain gradients induce the electric polarization in the direct flexoelectricity. Due to the large strain gradients at the crack tip vicinity it is needed to consider the strain gradient theory model. Governing equations in this theory contain higher-order derivatives than in the conventional continuum mechanics approach. The mixed finite element method (FEM) is developed here for a general boundary value problem, where the standard C0 continuous finite elements are applied for independent approximations of displacements and strains. The constraints between them are satisfied by collocation at appropriate internal points in elements. Interface cracks are observed in layered structures frequently due to a poor adhesion of layers. The incorporation of flexoelectricity and micro-inertial effects is needed into the failure analysis of interface cracks in nano-sized structures under dynamic loading. In numerical examples, we discuss the influence of flexoelectricity coefficients as well as the ratio of elastic coefficients and the geometrical size to microstructural (micro-stiffness and micro-inertia) length scale parameters of the bilayer composite on the crack opening displacement, stresses ahead the crack tip and induced electric intensity vector.
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[citace_text] => SLÁDEK, J.; SLÁDEK, V.; HRYTSYNA, M.; PROFANT, T. Influence of flexoelectricity on interface crack problems under a dynamic load. ENGINEERING FRACTURE MECHANICS, 2023, vol. 288, no. 4.8.2023, p. 109353-109353. ISSN: 0013-7944.
[citace_html] => SLÁDEK, J.; SLÁDEK, V.; HRYTSYNA, M.; PROFANT, T. Influence of flexoelectricity on interface crack problems under a dynamic load. ENGINEERING FRACTURE MECHANICS, 2023, vol. 288, no. 4.8.2023, p. 109353-109353. ISSN: 0013-7944.
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author="Ján {Sládek} and Vladimír {Sládek} and Maryan {Hrytsyna} and Tomáš {Profant}",
title="Influence of flexoelectricity on interface crack problems under a dynamic load",
journal="ENGINEERING FRACTURE MECHANICS",
year="2023",
volume="288",
number="4.8.2023",
pages="109353--109353",
doi="10.1016/j.engfracmech.2023.109353",
issn="0013-7944",
url="https://www.sciencedirect.com/science/article/pii/S0013794423003119?via%3Dihub"
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[nazev_en] => Influence of flexoelectricity on interface crack problems under a dynamic load
[popis_en] => In the present paper, the influence of flexoelectricity on behavior of the interface crack between two dissimilar dielectric materials under a dynamic mechanical load is investigated. The induced electric field affects the distribution and evolution of mechanical fields in dielectric materials. Large strain gradients induce the electric polarization in the direct flexoelectricity. Due to the large strain gradients at the crack tip vicinity it is needed to consider the strain gradient theory model. Governing equations in this theory contain higher-order derivatives than in the conventional continuum mechanics approach. The mixed finite element method (FEM) is developed here for a general boundary value problem, where the standard C0 continuous finite elements are applied for independent approximations of displacements and strains. The constraints between them are satisfied by collocation at appropriate internal points in elements. Interface cracks are observed in layered structures frequently due to a poor adhesion of layers. The incorporation of flexoelectricity and micro-inertial effects is needed into the failure analysis of interface cracks in nano-sized structures under dynamic loading. In numerical examples, we discuss the influence of flexoelectricity coefficients as well as the ratio of elastic coefficients and the geometrical size to microstructural (micro-stiffness and micro-inertia) length scale parameters of the bilayer composite on the crack opening displacement, stresses ahead the crack tip and induced electric intensity vector.
[klicova_slova_en] => Direct flexoelectricity; Gradient theory; Micro -inertia effect; A dynamic mechanical load; Induced electric potential
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