Browsing Ústav konstruování by Title
Now showing items 1-20 of 56
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Analysis of Chemisorbed Tribo-Film for Ceramic-on-Ceramic Hip Joint Prostheses by Raman Spectroscopy
(MDPI, 2021-07-01)To understand the possible lubricant mechanism in ceramic-on-ceramic hip joint prostheses, biochemical reactions of the synovial fluid and the corresponding frictional coefficients were studied. The experiments were performed ... -
Analysis of Friction in Total Knee Prosthesis during a Standard Gait Cycle
(MDPI, 2021-04-03)Total knee arthroplasty is on the rise worldwide. Despite its success, revision surgeries are also increasing. According to the American Joint Replacement Registry 2020, 3.3% of revision surgeries are due to wear, and 24.2% ... -
Analytical Formula for the Ratio of Central to Minimum Film Thickness in a Circular EHL Contact
(MDPI, 2018-09-07)Prediction of minimum film thickness is often used in practice for calculation of film parameter to design machine operation in full film regime. It was reported several times that majority of prediction formulas cannot ... -
Biotribology of Synovial Cartilage: A New Method for Visualization of Lubricating Film and Simultaneous Measurement of the Friction Coefficient
(MDPI, 2020-04-30)A healthy natural synovial joint is very important for painless active movement of the natural musculoskeletal system. The right functioning of natural synovial joints ensures well lubricated contact surfaces with a very ... -
Case study of multiaxial criteria for rolling contact fatigue of bearing steels
(EDP Sciences, 2018-05-25)A rolling contact fatigue (RCF) differs from the classic fatigue in a stress-state. Nowadays, a prediction of the RCF is still not on the sufficient level. A lot of researchers tried to apply different multiaxial fatigue ... -
Case study: the influence of oil-based friction modifier quantity on tram braking distance and noise
(Serbian Tribology Society, 2017-06-21)In the present study, the twin disc machine and the light rail system was employed in order to investigate the ability of oil-based friction modifier (FM) to optimize adhesion and to reduce noise. The risks associated with ... -
Computational Approaches of Quasi-Static Compression Loading of SS316L Lattice Structures Made by Selective Laser Melting
(MDPI, 2021-05-10)Additive manufacturing methods (AM) allow the production of complex-shaped lattice structures from a wide range of materials with enhanced mechanical properties, e.g., high strength to relative density ratio. These structures ... -
Design of a frictionless magnetorheological damper with a high dynamic force range
(SAGE, 2019-03-19)This article discusses an increase in dynamic force range in a spring-damper unit achieved by elimination of sealings´ friction. This friction is a part of damping force that cannot be controlled; therefore, it is undesirable ... -
Direct comparison between Co-28Cr-6Mo alloy prepared by Selective Laser Melting and traditional investment casting
(IOP Publishing, 2021-09-22)Thanks to high mechanical properties stable at elevated temperatures, high abrasion resistance, suitable corrosion resistance and biocompatibility, ternary cobalt alloy Co-28Cr-6Mo is a widely used material in the field ... -
Dual Hysteresis Model of MR Dampers
(Frontiers, 2020-09-24)This study concerns the modeling of the hysteretic behavior of magnetorheological (MR) dampers. In general, hysteresis is one of key factors influencing the output of such actuators. So far, more attention has been paid ... -
Dynamic Loading of Lattice Structure Made by Selective Laser Melting-Numerical Model with Substitution of Geometrical Imperfections
(MDPI, 2018-10-29)This article deals with the prediction of lattice structure mechanical properties under dynamic loading using finite element method (FEA) with inclusion of geometrical imperfections of the SLM process. Such properties are ... -
Effect of heat treatment on mechanical properties and residual stresses in additively manufactured parts
(Institute of Theoretical and Applied Mechanics of the Czech Academy of Sciences, 2018-05-14)Heat treatments commonly used for post-processing in additive manufacturing (AM) deal with relieving residual stresses. However, generally these treatments reduce strength properties of material such as yield stress (YS) ... -
The Effect of Kinematic Conditions and Synovial Fluid Composition on the Frictional Behaviour of Materials for Artificial Joints
(MDPI, 2018-05-10)The paper introduces an experimental investigation of frictional behaviour of materials used for joint replacements. The measurements were performed using a ball-on-disc tribometer, while four material combinations were ... -
Effect of Laser Parameters on Processing of Biodegradable Magnesium Alloy WE43 via Selective Laser Melting Method
(MDPI, 2020-06-09)The global aim of the theme of magnesium alloy processing by the selective laser melting technology is to enable printing of replacements into the human body. By combining the advantages of WE43 magnesium alloy and additive ... -
Effect of Process Parameters and High-Temperature Preheating on Residual Stress and Relative Density of Ti6Al4V Processed by Selective Laser Melting
(MDPI, 2019-03-20)The aim of this study is to observe the effect of process parameters on residual stresses and relative density of Ti6Al4V samples produced by Selective Laser Melting. The investigated parameters were hatch laser power, ... -
The effect of surface grooves on film breakdowns in point contacts
(Elsevier, 2016-10-01)Surface roughness plays an important role in transition from full to mixed elastohydrodynamic regime. One kind of features appearing on a real rough surface are grooves longer than contact diameter. It has already been ... -
The effect of synovial fluid composition, speed and load on frictional behaviour of articular cartilage
(MDPI, 2020-03-15)Articular cartilage ensures smooth motion of natural synovial joints operating at very low friction. However, number of patients suffering from joint diseases, usually associated with cartilage degradation, continuously ... -
The Effect of the Wear of Rotor Pins on Grinding Efficiency in a High-speed Disintegrator
(Kaunas University of Technology, 2018-02-19)One of the directions intensively investigated in the field of milling is high-energy milling (HEM). One type of HEM is high-speed grinding in high-speed disintegrators. This type of mill is particularly suitable for the ... -
Effects of solid friction modifier on friction and rolling contact fatigue damage of wheel-rail surfaces
(Springer, 2021-07-22)In railway network, friction is an important factor to consider in terms of the service behaviors of wheel-rail system. The objective of this study was to investigate the effect of a solid friction modifier (FM) in a railway ... -
Erosive wear properties of ZA-27 alloy-based nanocomposites: Influence of type, amount and size of nanoparticle reinforcements
(Tsinghua University Press, 2019-07-01)Metal matrix nanocomposites (MMnCs) consist of a metal matrix filled with nano-size reinforcements featuring physical and mechanical properties very different from those of the matrix. In ZA- 27 alloy-based nanocomposites ...