Vibroacoustic Study of Abrasive Wear of Multilayered Sliding Bearings

2019 ◽  
Vol 822 ◽  
pp. 662-668
Author(s):  
Andrey Vladimirovich Tikalov ◽  
Leonid Vladimirovich Yefremov
Keyword(s):  
Abrasive Wear ◽  
Friction Model ◽  
Sliding Bearings ◽  
Grain Sizes ◽  
Vibroacoustic Diagnostics ◽  
Selection Of

The article substantiates consistent patterns of wear at the example of microcutting materials in sliding bearings in dependence to grain sizes of abrasive cloths and hardness of bearing layers received with the use of vibroacoustic diagnostics and the method of artificial bases (MAB) in testing on the SMC-2 frictional machine. These patterns can be helpful for the assessment of quality and selection of materials for products [1,2], selection of the friction model [3], and selection of abrasive cloths for the diagnostics of the latter and assessment of the running-in period for the top coating.

Friction and wear behaviors of sand particle against casing steel

2018 ◽  
Vol 233 (3) ◽  
pp. 393-405
Author(s):  
Liu Yang ◽  
Deguo Wang ◽  
Yanbao Guo ◽  
Shuhai Liu
Keyword(s):  
Abrasive Wear ◽  
Friction And Wear ◽  
Oil And Gas ◽  
Wear Behavior ◽  
Processing Condition ◽  
Friction Model ◽  
Real Contact Area ◽  
Sand Particle ◽  
Friction Resistance ◽  
The Impact

Tools abrasive wear due to sand particles has caused severe damage during oil and gas exploitation. The friction and wear behaviors of single quartz sand particle against N80 casing steel were investigated to estimate the particle transport resistance and particle abrasive wear behavior using a homemade tribometer in wellbore sand cleanout. Various measurements were conducted to research the impact factor of particle under different water processing condition, dry, short immersion, wet, influences of load and slide velocity. Experimental results indicated that particle-casing friction resistance is mainly formed due to plowing and adhesion effect. Casing transfer and plowing removal are two main damage forms. Particle real contact area increases noticeably after water absorption, which decreases the hertz contact stress and finally produces less plowing depth of casing steel and causes less damage. With load increasing, friction resistance and wear increase with addition of plowing depth. A simple particle-casing friction model was established considering the experimental contact behavior.

ABRASIVE WEAR MECHANISMS OF ANTIWEAR COATINGS IN BALL-CRATERING TESTS

Tribologia ◽  
2016 ◽  
Vol 270 (6) ◽  
pp. 95-106
Author(s):  
Edyta OSUCH-SŁOMKA
Keyword(s):  
Abrasive Wear ◽  
Surface Coating ◽  
Boundary Surface ◽  
Work Conditions ◽  
Pvd Coatings ◽  
Repetitive Nature ◽  
Microscopic Techniques ◽  
Selection Of ◽  
Scanning Electron

The article is a continuation of research on the mechanisms of wear on PVD coatings observed after tests had been performed with the use of the ball-cratering method evaluating the wear. The work conditions of friction point in which tribological tests had been performed were calculated based on the optimization experiments described in independent studies [L. 1–2]. The aim of the article is to analyse the boundary surface coating–substrate resulting from abrasive wear. The observed area is located on the border of the trace of wear in the shape of a crater, at the point of the exit of the ball from the trace in accordance with the direction of the selection of the coating. The tested surface was observed with the use of microscopic techniques: scanning electron microscope (SEM) and interferometric microscope (WLI). The authors attempted to present the repetitive nature of the mechanism of the wear of thin PVD coatings with the use of the ball-cratering method, including its influences on receiving repeated traces of wear, which, in turn, has an influence on the determination of a reproducible value of the wear rate Kc, which is the factor determining the resistance of the tested coating to abrasive wear.

Simulation of Hot Extrusion of an Aluminum Alloy with Modeling of Microstructure

2011 ◽  
Vol 491 ◽  
pp. 257-264 ◽  
Author(s):  
A. Ockewitz ◽  
D.Z. Sun ◽  
F. Andrieux ◽  
Sören Müller
Keyword(s):  
Volume Fraction ◽  
Hot Extrusion ◽  
Friction Model ◽  
Recrystallization Temperature ◽  
Model Parameters ◽  
Compression Tests ◽  
Forward Extrusion ◽  
Grain Sizes ◽  
Rate Dependent ◽  
Hydrostatic Stresses

In this work a numerical method for the simulation of extrusion processes with modeling of microstructure is presented. Extensive testing was done to provide a basis for the verification of simulation results. Circular rods of AA6005A were extruded by backward and forward extrusion with different extrusion ratios, billet temperatures and product velocities. The extruded rods were cooled either by water or at air to distinguish between dynamic and static recrystallization. Temperature and strain-rate dependent yield stresses were determined from hot compression tests. Special friction tests on cylindrical specimens under high hydrostatic stresses at high temperatures have been performed and the parameters of a friction model were identified from the experiments. The recrystallized volume fraction and grain sizes in the extruded rods were analyzed by means of optical micrographs. The obtained results were used to determine the parameters of a recrystallization model which was implemented in the FE code HyperXtrude. The transferability of the numerical model was checked by simulating forward extrusion tests using the model parameters obtained from backward extrusion tests.

scholarly journals Polyurethanes used in the endoprosthesis of joints

2010 ◽  
Vol 12 (3) ◽  
pp. 10-14 ◽  
Author(s):  
Agata Domańska ◽  
Anna Boczkowska ◽  
Marta Izydorzak ◽  
Zbigniew Jaegermann ◽  
Krzysztof Kurzydłowski
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Differential Scanning Calorimetry ◽  
Abrasive Wear ◽  
Biodegradable Polymer ◽  
Composite Ceramics ◽  
Ceramic Core ◽  
Scanning Calorimetry ◽  
Selection Of ◽  
Scanning Electron

Polyurethanes used in the endoprosthesis of joints The aim of the studies presented in this paper was the selection of the polyurethanes synthesized from different substrates in order to obtain i) ceramic - biodegradable polymer composite and ii) polyurethane resistant to abrasive wear. The polyurethanes were obtained from the crystalline prepolymers extended by water, because it may have a beneficial effect on the toxicity of the material. The properties of PUs were investigated using infrared spectroscopy, thermogravimetry, differential scanning calorimetry and scanning electron microscopy. In all the tested polyurethanes the peak from the reactive -NCO groups was not observed, which indicates that all the substrates are fully reacted. Such polyurethanes are characterized by interesting properties with the perspective use as components of ceramic-polymer joints endoprosthesis. The designed endoprosthesis should fulfill at least three functions: load bearing function (ceramic core), fastening and stabilizing endoprosthesis to the bone (composite ceramics - biodegradable polymer) and tribologic function allowing mating with parts of the prosthesis (polyurethane layer resistant to abrasive wear).

scholarly journals Selection of Materials and Technology for Forming the Layers Resistant to Abrasive Wear

2010 ◽  
Vol 18 (28) ◽  
pp. 59-68
Author(s):  
Silvia Revesová ◽  
Pavel Blaškovitš
Keyword(s):  
Wear Resistance ◽  
Abrasive Wear ◽  
Life Extension ◽  
Wear Resistant ◽  
Suitable Material ◽  
Agricultural Machine ◽  
Machine Parts ◽  
Selection Of

Selection of Materials and Technology for Forming the Layers Resistant to Abrasive Wear This article deals with the selection of materials for forming wear resistant layers within agricultural machine parts wear. We can achieve required hardness, wear resistance and life extension of agricultural machine parts and tools by the selection of a suitable material and surfacing technology.

scholarly journals Experimental method for the selection of points of measurement diagnostic vibration signals on internal combustion engine

2012 ◽  
Vol 150 (3) ◽  
pp. 72-79
Author(s):  
Grzegorz SZYMAŃSKI ◽  
Franciszek TOMASZEWSKI
Keyword(s):  
Internal Combustion Engine ◽  
Combustion Engine ◽  
Diagnostic Testing ◽  
Internal Combustion ◽  
Test Point ◽  
Diagnostic Methods ◽  
Essential Information ◽  
Vibroacoustic Diagnostics ◽  
Selection Of ◽  
Working Processes

The diagnostic testing of internal combustion engine can be made by using working processes and methods which take advantage of leftover processes. Working processes give information about general condition of internal combustion engine. Leftover processes give information about condition of particular subassemblies and kinematic couples; hence they are used as autonomous processes or as processes supporting other diagnostic methods. Methods based on analysis of vibrations and noise changes to determine technical condition of object are named as vibroacoustic diagnostics. In papers about vibroacoustic diagnostics of engine, problems connected with difficulty to select test point and to define diagnostic parameters containing essential information about engine’s condition, are most often omitted. Selection of engine’s working parameters and conditions of taking measurements or recording vibration signal are usually based on references, researcher’s experience or intuition. General assumptions about taking measurements of signal closest to its source are most often used. This paper presents a new approach to vibroacoustic diagnostics of internal combustion engine. Selection of test points of vibration on the basis of impact tests results was suggested and performed a sensitivity analysis of measurement points on the cylinder head, the force impulse.

scholarly journals Methods of Research of Foil Bearings in START-STOP Cycle in the Presence of Working Medium

2019 ◽  
Vol 23 (4) ◽  
pp. 41-51
Author(s):  
Bartosz Moczulak ◽  
Wojciech Miąskowski
Keyword(s):  
Test Chamber ◽  
Test Cycle ◽  
Time Intervals ◽  
Sliding Bearings ◽  
Foil Bearings ◽  
Working Cycle ◽  
Automatic Mode ◽  
Working Medium ◽  
Stop Test ◽  
Selection Of

AbstractA method for testing sliding bearings with an elastic bearing liner was presented in the paper with a focus on the issue of selection of particular time intervals of the START-STOP test cycle. Then, results of the tests carried out according to the selected material combinations were presented. The working cycle of foil bearings tested on the test stand was performed in an automatic mode at the set number of sequences start-work-rundown-stop. Due to the highest use of sliding bearings during start and rundown of a machine, this type of tests is essential for selection of relevant sets of material for bearing elements. The article also presents the use of a thermo-visual camera for identification of additional thermal loads and manners of temperature stabilization in the test chamber.

scholarly journals Analysis of measurement points sensitivity of vibration signals on the stand of jet engine

2017 ◽  
Vol 171 (4) ◽  
pp. 279-282
Author(s):  
Grzegorz SZYMAŃSKI ◽  
Wojciech MISZTAL
Keyword(s):  
Internal Combustion Engine ◽  
Combustion Engine ◽  
Internal Combustion ◽  
Diagnostic Methods ◽  
Essential Information ◽  
Vibration Signals ◽  
Jet Engine ◽  
Vibroacoustic Diagnostics ◽  
Selection Of ◽  
Working Processes

The diagnostic testing of internal combustion engine can be made by using working processes and methods which take advantage of leftover processes. Working processes give information about general condition of internal combustion engine. Leftover processes give information about condition of particular subassemblies and kinematic couples; hence they are used as autonomous processes or as processes supporting other diagnostic methods. Methods based on analysis of vibrations and noise changes to determine technical condition of object are named as vibroacoustic diagnostics. In papers about vibroacoustic diagnostics of engine, problems connected with difficulty to select test point and to define diagnostic parameters containing essential information about engine’s condition, are most often omitted. Selection of engine’s working parameters and conditions of taking measurements or recording vibration signal are usually based on references, researcher’s experience or intuition. General assumptions about taking measurements of signal closest to its source are most often used. This paper presents a new approach to vibroacoustic diagnostics of jet engine. Selection of measurement points of vibration signals on the basis of tests stand results was suggested and perform a sensitivity analysis of measurement points on the engine support.

Sign in / Sign up

Export Citation Format

Share Document