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[nazev] => Analysing plate fixation of a comminuted fracture of the proximal ulna in relation to the elbow joint: a finite element study
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[popis] => This study investigated the biomechanical behavior of four different screw configurations used to fix comminuted proximal ulna fractures with a locking compression plate (LCP), via a detailed finite element model based on realistic anatomical geometry. The model incorporated realistic anatomical geometry including both cortical and cancellous bone, soft tissue constraints, and loading conditions representing the physiological self-weight of the forearm, with the humerus fixed at its proximal end. The stress distribution on the plate, strain intensity within the bone tissue, and interfragmentary motion (IFM) between fracture fragments were evaluated for each configuration. The results indicate that all the tested configurations provide adequate stability under normal loading conditions, with no risk of material failure. However, excessive stress concentrations were observed in specific screw regions depending on the configuration, particularly when proximal screws anchoring the olecranon (e.g. screws 2 and 3 in Variant 3) were omitted. Strain analysis revealed moderate physiological bone loading across variants, whereas IFM assessment highlighted the importance of securing the coronoid and apical fragments to prevent compromised healing. These findings suggest that a specific reductions in osteosynthetic material, such as omitting certain diaphyseal screws while maintaining crucial olecranon and coronoid fixation, may provide sufficient fracture stabilisation under the modelled conditions, potentially minimising implant-related complications. This modelling approach offers a valuable tool for preclinical assessment of osteosynthesis strategies and supports future comparative research on fixation methods with varying biomechanical properties.
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[citace_text] => ŠAFRAN, J.; PAVLACKÝ, T.; MARCIÁN, P.; HERŮFEK, R.; VESELÝ, R. Analysing plate fixation of a comminuted fracture of the proximal ulna in relation to the elbow joint: a finite element study. Journal of orthopaedic surgery and research, 2025, vol. 20, no. 1, p. 1-16. ISSN: 1749-799X.
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[nazev_en] => Analysing plate fixation of a comminuted fracture of the proximal ulna in relation to the elbow joint: a finite element study
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[klicova_slova_en] => Proximal ulna comminuted fracture; Elbow joint; Olecranon fracture; Finite element analysis; Locking compression plate; Interfragmentary motion
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pages="47--59",
issn="0954-0075"
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[nazev_en] => Numerical evaluation of pressure from experimentally measured film thickness in EHL point contact
[popis_en] => This paper is concerned with elastohydrodynamic lubrication, especially the determination of lubricant film thickness and contact pressure within a point contact of friction surfaces of machine parts. A new solution technique for numerical determination of contact pressure is introduced. The direct measurement of contact pressure is very difficult. Hence, input data of lubricant film thickness obtained from the experiment based on colorimetric interferometry are used for the calculation of pressure using the inverse elasticity theory. The algorithm is enhanced by convolution in order to increase calculation speed. The approach described in this contribution gives reliable results on smooth contact and in the future, it will be extended to enable the study of contact of friction surfaces with asperities.
[klicova_slova_en] => EHL, elastohydrodynamic lubrication, film thickness , contact pressure, colorimetric interferometry, convolution, inverse elasticity theory
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[citace_text] => PALOUŠEK, D.; ŠPAČEK, J. Kulaté výročí s desátým Inventorem. Computer Design. Computer Press, 2005. č. 2, s. 22-26. ISSN: 1212-4389.
[citace_html] => PALOUŠEK, D.; ŠPAČEK, J. Kulaté výročí s desátým Inventorem. Computer Design. Computer Press, 2005. č. 2, s. 22-26. ISSN: 1212-4389.
[citace_rtf] =>
[citace_bibtex] => @misc{BUT45562,
author="David {Paloušek} and Jiří {Špaček}",
title="Kulaté výročí s desátým Inventorem.",
year="2005",
journal="Computer Design",
volume="11",
number="2",
pages="22--26",
publisher="Computer Press",
issn="1212-4389",
note="Other unclassified results"
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[nazev_en] => 10th round jubilee of Autodesk Inventor
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(
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[nazev] => Behavior of thin viscous boundary films in lubricated contacts between micro-textured surfaces
[nazev_orig] => Behavior of thin viscous boundary films in lubricated contacts between micro-textured surfaces
[duvernost_udaju_id] => S
[popis] => Thin film colorimetric interferometry was used to map changes in film thickness in the vicinity of micro-dents of various depths produced on rubbing surfaces. It has been shown in recent studies that shallow micro-features within concentrated contact can increase mean film thickness by supplying more lubricant to the contact; however, this beneficial effect can also be accompanied by a local film thickness reduction. Nevertheless, these observations were done with mineral base oils that exhibited no boundary films formation. In this study the behavior of micro-textured surfaces are observed using formulated lubricant containing polyalcylmethacrylate (PAMA), viscosity index improver with boundary film forming properties. Obtained results show that an enlarged film thickness due to the presence of viscous boundary films is formed within the whole contact and these boundary films minimize the local film thickness reduction caused by micro-dents and further increase the efficiency of surface texturing within non-conformal contacts. It can be suggested from the obtained results that joint action of both boundary film formation and surface texturing combines both contributions that can help to increase tribological performances in different stages of machine parts operation by increasing lubrication film thickness.
[popis_orig] => Thin film colorimetric interferometry was used to map changes in film thickness in the vicinity of micro-dents of various depths produced on rubbing surfaces. It has been shown in recent studies that shallow micro-features within concentrated contact can increase mean film thickness by supplying more lubricant to the contact; however, this beneficial effect can also be accompanied by a local film thickness reduction. Nevertheless, these observations were done with mineral base oils that exhibited no boundary films formation. In this study the behavior of micro-textured surfaces are observed using formulated lubricant containing polyalcylmethacrylate (PAMA), viscosity index improver with boundary film forming properties. Obtained results show that an enlarged film thickness due to the presence of viscous boundary films is formed within the whole contact and these boundary films minimize the local film thickness reduction caused by micro-dents and further increase the efficiency of surface texturing within non-conformal contacts. It can be suggested from the obtained results that joint action of both boundary film formation and surface texturing combines both contributions that can help to increase tribological performances in different stages of machine parts operation by increasing lubrication film thickness.
[klicova_slova] => Thin film lubrication; Film thickness; Surface texturing; Boundary films
[klicova_slova_orig] => Thin film lubrication; Film thickness; Surface texturing; Boundary films
[url] =>
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[identifikator_popis] => ISSN - Tribology International (GB)
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[citace_text] => KŘUPKA, I.; HARTL, M.; POLIŠČUK, R. Behavior of thin viscous boundary films in lubricated contacts between micro-textured surfaces. Tribology International, 2008, vol. 42, no. X, p. 1-7. ISSN: 0301-679X.
[citace_html] => KŘUPKA, I.; HARTL, M.; POLIŠČUK, R. Behavior of thin viscous boundary films in lubricated contacts between micro-textured surfaces. Tribology International, 2008, vol. 42, no. X, p. 1-7. ISSN: 0301-679X.
[citace_rtf] =>
[citace_bibtex] => @article{BUT47111,
author="Ivan {Křupka} and Martin {Hartl} and Radek {Poliščuk}",
title="Behavior of thin viscous boundary films in lubricated contacts between micro-textured surfaces",
journal="Tribology International",
year="2008",
volume="42",
number="X",
pages="1--7",
issn="0301-679X"
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[nazev_en] => Behavior of thin viscous boundary films in lubricated contacts between micro-textured surfaces
[popis_en] => Thin film colorimetric interferometry was used to map changes in film thickness in the vicinity of micro-dents of various depths produced on rubbing surfaces. It has been shown in recent studies that shallow micro-features within concentrated contact can increase mean film thickness by supplying more lubricant to the contact; however, this beneficial effect can also be accompanied by a local film thickness reduction. Nevertheless, these observations were done with mineral base oils that exhibited no boundary films formation. In this study the behavior of micro-textured surfaces are observed using formulated lubricant containing polyalcylmethacrylate (PAMA), viscosity index improver with boundary film forming properties. Obtained results show that an enlarged film thickness due to the presence of viscous boundary films is formed within the whole contact and these boundary films minimize the local film thickness reduction caused by micro-dents and further increase the efficiency of surface texturing within non-conformal contacts. It can be suggested from the obtained results that joint action of both boundary film formation and surface texturing combines both contributions that can help to increase tribological performances in different stages of machine parts operation by increasing lubrication film thickness.
[klicova_slova_en] => Thin film lubrication; Film thickness; Surface texturing; Boundary films
[vysledek_datum] => 2008-05-12T00:00:00+02:00
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[13] => Array
(
[vysledek_id] => 47937
[vysledek_druh_id] => ART
[ex_vysledek_id] => 82428
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[nazev] => Effect of surface dents on contact pressure in elastohydrodynamic contacts
[nazev_orig] => Effect of surface dents on contact pressure in elastohydrodynamic contacts
[duvernost_udaju_id] => S
[popis] => Nowadays film thickness measurement techniques can provide precise data for the detailed studies of the behaviour of lubricated contacts including transient operational conditions. Contact pressure is in relation with deformation of rubbing surfaces, which can be derived from experimentally evaluated film thickness. Even though the pressure distribution evaluated from measured film thickness is very sensitive to its accuracy, this approach represents a powerful tool for elastohydrodynamic pressure determination thanks to the relative wide availability of film thickness measurement techniques. Chromatic interferograms can be captured within a few microseconds so that this approach seems to be promising in obtaining relevant pressure data even within non-smooth lubricated contacts. This paper presents the results of the effort to extend the applicability of the pressure-film thickness evaluation approach to the non-smooth surfaces. It was found that the main problem is to obtain the film thickness distribution within the whole contact including the inside portion of the deep surface features (e.g. dents). That is why the combination of film thickness data and undeformed dent topography was suggested to overcome these limitations. This approach was validated through the comparison with numerical solution using dented surface and was tested on selected dented contacts operated under thin film and very thin film lubrication conditions.
[popis_orig] => Nowadays film thickness measurement techniques can provide precise data for the detailed studies of the behaviour of lubricated contacts including transient operational conditions. Contact pressure is in relation with deformation of rubbing surfaces, which can be derived from experimentally evaluated film thickness. Even though the pressure distribution evaluated from measured film thickness is very sensitive to its accuracy, this approach represents a powerful tool for elastohydrodynamic pressure determination thanks to the relative wide availability of film thickness measurement techniques. Chromatic interferograms can be captured within a few microseconds so that this approach seems to be promising in obtaining relevant pressure data even within non-smooth lubricated contacts. This paper presents the results of the effort to extend the applicability of the pressure-film thickness evaluation approach to the non-smooth surfaces. It was found that the main problem is to obtain the film thickness distribution within the whole contact including the inside portion of the deep surface features (e.g. dents). That is why the combination of film thickness data and undeformed dent topography was suggested to overcome these limitations. This approach was validated through the comparison with numerical solution using dented surface and was tested on selected dented contacts operated under thin film and very thin film lubrication conditions.
[klicova_slova] => Elastohydrodynamic lubrication; Pressure; Film thickness; Dents
[klicova_slova_orig] => Elastohydrodynamic lubrication; Pressure; Film thickness; Dents
[url] =>
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[ins_ts] => 2025-09-22
[upd_ts] => 2025-09-22
[status] => 9
[identifikator] => ISSN 1350-6501
[identifikator_popis] => ISSN - PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART J-JOURNAL OF ENGINEERING TRIBOLOGY (GB)
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[citace_text] => KŘUPKA, I.; HARTL, M.; VRBKA, M.; VAVERKA, M.; POLIŠČUK, R. Effect of surface dents on contact pressure in elastohydrodynamic contacts. PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART J-JOURNAL OF ENGINEERING TRIBOLOGY, 2009, vol. 223, no. 4, p. 683-693. ISSN: 1350-6501.
[citace_html] => KŘUPKA, I.; HARTL, M.; VRBKA, M.; VAVERKA, M.; POLIŠČUK, R. Effect of surface dents on contact pressure in elastohydrodynamic contacts. PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART J-JOURNAL OF ENGINEERING TRIBOLOGY, 2009, vol. 223, no. 4, p. 683-693. ISSN: 1350-6501.
[citace_rtf] =>
[citace_bibtex] => @article{BUT47937,
author="Ivan {Křupka} and Martin {Hartl} and Martin {Vrbka} and Michal {Vaverka} and Radek {Poliščuk}",
title="Effect of surface dents on contact pressure in elastohydrodynamic contacts",
journal="PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART J-JOURNAL OF ENGINEERING TRIBOLOGY",
year="2009",
volume="223",
number="4",
pages="683--693",
issn="1350-6501"
}
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[nazev_en] => Effect of surface dents on contact pressure in elastohydrodynamic contacts
[popis_en] => Nowadays film thickness measurement techniques can provide precise data for the detailed studies of the behaviour of lubricated contacts including transient operational conditions. Contact pressure is in relation with deformation of rubbing surfaces, which can be derived from experimentally evaluated film thickness. Even though the pressure distribution evaluated from measured film thickness is very sensitive to its accuracy, this approach represents a powerful tool for elastohydrodynamic pressure determination thanks to the relative wide availability of film thickness measurement techniques. Chromatic interferograms can be captured within a few microseconds so that this approach seems to be promising in obtaining relevant pressure data even within non-smooth lubricated contacts. This paper presents the results of the effort to extend the applicability of the pressure-film thickness evaluation approach to the non-smooth surfaces. It was found that the main problem is to obtain the film thickness distribution within the whole contact including the inside portion of the deep surface features (e.g. dents). That is why the combination of film thickness data and undeformed dent topography was suggested to overcome these limitations. This approach was validated through the comparison with numerical solution using dented surface and was tested on selected dented contacts operated under thin film and very thin film lubrication conditions.
[klicova_slova_en] => Elastohydrodynamic lubrication; Pressure; Film thickness; Dents
[vysledek_datum] => 2009-04-01T00:00:00+02:00
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[nazev] => Effect of surface texturing on elastohydrodynamically lubricated contact under transient speed conditions
[nazev_orig] => Effect of surface texturing on elastohydrodynamically lubricated contact under transient speed conditions
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[popis] => Effect of surface topography modifications on lubrication film thickness within non-conformal lubricated contact operated under transient speed conditions is observed. Optical test rig is used to observe the lubricant film behaviour between the flat surface of a chromium coated glass disc and a steel ball under simplified operational conditions modelling the cam and tappet contact. Numerical simulation was used to be able to choose the operating conditions suitable for experiments. An array of micro-dents was produced on the ball surface to be able to demonstrate the effect of surface topography on lubrication film formation. Experiments were carried out under elastohydrodynamic lubrication conditions. Obtained results have shown that surface texturing could represent the way how to increase lubrication efficiency of rolling/sliding non-conformal contacts under transient operational conditions through the lubricant emitted from micro-dents. It was found that the lubricant emitted from the micro-dents helps to separate rubbing surfaces especially under thin film lubrication conditions where the rubbing surfaces moves in the opposite direction.
[popis_orig] => Effect of surface topography modifications on lubrication film thickness within non-conformal lubricated contact operated under transient speed conditions is observed. Optical test rig is used to observe the lubricant film behaviour between the flat surface of a chromium coated glass disc and a steel ball under simplified operational conditions modelling the cam and tappet contact. Numerical simulation was used to be able to choose the operating conditions suitable for experiments. An array of micro-dents was produced on the ball surface to be able to demonstrate the effect of surface topography on lubrication film formation. Experiments were carried out under elastohydrodynamic lubrication conditions. Obtained results have shown that surface texturing could represent the way how to increase lubrication efficiency of rolling/sliding non-conformal contacts under transient operational conditions through the lubricant emitted from micro-dents. It was found that the lubricant emitted from the micro-dents helps to separate rubbing surfaces especially under thin film lubrication conditions where the rubbing surfaces moves in the opposite direction.
[klicova_slova] => Elastohydrodynamic; Film thickness; Surface texturing; Transient speed conditions
[klicova_slova_orig] => Elastohydrodynamic; Film thickness; Surface texturing; Transient speed conditions
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[citace_text] => KŘUPKA, I.; HARTL, M.; ZIMMERMAN, M.; HOUŠKA, P.; JANG,S. Effect of surface texturing on elastohydrodynamically lubricated contact under transient speed conditions. Tribology International, 2011, vol. 44, no. 10, p. 1144-1150. ISSN: 0301-679X.
[citace_html] => KŘUPKA, I.; HARTL, M.; ZIMMERMAN, M.; HOUŠKA, P.; JANG,S. Effect of surface texturing on elastohydrodynamically lubricated contact under transient speed conditions. Tribology International, 2011, vol. 44, no. 10, p. 1144-1150. ISSN: 0301-679X.
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author="KŘUPKA, I. and HARTL, M. and ZIMMERMAN, M. and HOUŠKA, P. and JANG,S.",
title="Effect of surface texturing on elastohydrodynamically lubricated contact under transient speed conditions",
journal="Tribology International",
year="2011",
volume="44",
number="10",
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issn="0301-679X"
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[nazev_en] => Effect of surface texturing on elastohydrodynamically lubricated contact under transient speed conditions
[popis_en] => Effect of surface topography modifications on lubrication film thickness within non-conformal lubricated contact operated under transient speed conditions is observed. Optical test rig is used to observe the lubricant film behaviour between the flat surface of a chromium coated glass disc and a steel ball under simplified operational conditions modelling the cam and tappet contact. Numerical simulation was used to be able to choose the operating conditions suitable for experiments. An array of micro-dents was produced on the ball surface to be able to demonstrate the effect of surface topography on lubrication film formation. Experiments were carried out under elastohydrodynamic lubrication conditions. Obtained results have shown that surface texturing could represent the way how to increase lubrication efficiency of rolling/sliding non-conformal contacts under transient operational conditions through the lubricant emitted from micro-dents. It was found that the lubricant emitted from the micro-dents helps to separate rubbing surfaces especially under thin film lubrication conditions where the rubbing surfaces moves in the opposite direction.
[klicova_slova_en] => Elastohydrodynamic; Film thickness; Surface texturing; Transient speed conditions
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