Browsing Ústav konstruování by Title
Now showing items 1-20 of 20
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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 ... -
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 ... -
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 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 ... -
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 ... -
Experimental and Computational Evaluation of Rolling Bearing Steel Durability
(Tanger Ltd., 2016-11-09)Rolling element bearings are widely-used machine components and their failure can result in damage to the whole machine. A bearing failure can be caused by many factors. In most cases it is damage on the raceway surface ... -
Experimental comparison of the behavior between base oil and grease starvation based on inlet film thickness
(Serbian Tribology Society, 2017-03-24)This paper deals with the experimental study of an elastohydrodynamic contact under conditions of insufficient lubricant supply. Starvation level of this type of the contact may be experimentally determined based on the ... -
Frictional response of lubricant in EHL contact under transient bi-directional shear loading
(Serbian Tribology Society, 2017-12-15)Consideration of performance, efficiency and energy consumption is nowadays an inherent part of the design of every modern machine. These factors are mainly determined by mechanisms taking place within the lubricated ... -
Influence of response time of magnetorheological valve in Skyhook controlled three-parameter damping system
(SAGE Publications, 2018-11-16)A three-parameter suspension system is often used for vibration isolation of sensitive devices especially in a space industry. This article describes the three-parameter suspension system with magnetorheological valve ... -
Influence of Scanning Strategies on Processing of Aluminum Alloy EN AW 2618 Using Selective Laser Melting
(MDPI, 2018-02-14)This paper deals with various selective laser melting (SLM) processing strategies for aluminum 2618 powder in order to get material densities and properties close to conventionally-produced, high-strength 2618 alloy. To ... -
An Investigation on Adhesion Behavior of Solid Particles in Water Contaminated Wheel-Rail Contact
(MDPI, 2018-09-14)The objective of this study was to investigate the influence of solid particles of talc in water contaminated wheel-rail contact. The main aim was to identify situations where low adhesion can occur and define properties ... -
Lubricant flow in thin-film elastohydrodynamic contact under extreme conditions
(Tsinghua University Press, 2016-12-01)To further extend knowledge about fluid film friction in elastohydrodynamic contact, it is important to examine how lubricant flows. In this paper, several film thickness results obtained by interferometry technique for ... -
Selective Laser Melting Strategy for Fabrication of Thin Struts Usable in Lattice Structures
(MDPI, 2018-09-18)This paper deals with the selective laser melting (SLM) processing strategy for strut-lattice structure production which uses only contour lines and allows the porosity and roughness level to be managed based on ombination ... -
Top-of-Rail Lubricants: Potential Risks and Benefits
(MDPI, 2018-06-05)Top-of-rail (TOR) lubricants represent modern approach for friction modification between wheel and rail. The main goal of this study was to investigate potential risks and benefits associated with the application of these ... -
Tribological studies on copper-based friction linings
(Faculty of Engineering, University of Kragujevac, Serbia, 2017-06-22)The objects of this work were nine different copper-based friction linings produced from powder by pressing and sintering. Six copper-based friction linings contained 3 wt.% zinc (Zn) and variable content of tin (Sn), i.e. ... -
The Use of Acoustic Emission Method for Diagnosis of Damage of Pneumatic Cylinders
(German Society for NDT, 2016-06-13)The paper presents the latest results obtained in the course of the project Technology Agency of the Czech Republic, which aims to create a new diagnostic system for checking the function of pneumatic cylinders using ...