Gotowe bibliografie tematyczne / Wear Test Rig

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Gotowa bibliografia na temat „Wear Test Rig”

Autor: Grafiati

Data publikacji: 4 czerwca 2021

Data aktualizacji: 12 lutego 2022

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Artykuły w czasopismach na temat "Wear Test Rig"

Burgess, Stuart C., Torquil Pyper i Chung Seng Ling. "A linear actuated chain test rig capable of accelerated test speeds and continuous wear measurements". Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 227, nr 5 (22.06.2012): 1047–55. http://dx.doi.org/10.1177/0954406212451546.

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This article presents a novel linear actuated chain test rig, which is capable of accelerated test speeds and continuous wear measurements. The ability to measure chain wear in situ saves time and expense compared to a conventional sprocket driven rig because the traditional rig requires the chain to be dismantled in order to monitor wear. In situ chain measurement reduces errors significantly. The novel test rig does not have a traditional set up of rotary driven sprocket and chain but uses a pneumatic linear actuator to articulate a short section of chain, which is preloaded between two cantilevers. This design leads to a compact rig with only few moving parts and allows accelerated testing at high frequencies. Linear encoder displacement transducers are used to measure changes in chain length down to 0.06 µm at a rate of 4000 readings per second. Sample wear tests on different chains have been conducted to compare life test results with conventional sprocket-driven tests rig. A good correlation was obtained between the steady-state wear rate for three different brands of roller chain.

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Leonard, Benjamin D., Farshid Sadeghi, Sachin Shinde i Marc Mittelbach. "A novel modular fretting wear test rig". Wear 274-275 (styczeń 2012): 313–25. http://dx.doi.org/10.1016/j.wear.2011.09.015.

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Sevik, Yasar, i Ertugrul Durak. "Investigation of fretting wear in journal bearings". Industrial Lubrication and Tribology 68, nr 4 (13.06.2016): 466–75. http://dx.doi.org/10.1108/ilt-11-2015-0171.

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Purpose Fretting wear takes place when two contacting solid surfaces are subjected to relatively small amplitude oscillatory motion in the order of a few microns. The purpose of this paper is the design and manufacture of a fretting wear test rig that can analyze fretting wear on journal bearings. Design/methodology/approach This study included the manufacturing and operating principles of the test rig. In the test rig, the shaft was fixed and vibrational motion was given to the bearing housing. Vibration motion the amplitude of which could be adjusted was used on the test rig. The vibration motion was applied to a two-piece journal bearing on a fixed shaft supported from both ends. Findings Vibration amplitude was provided by a micro vibration engine (motor) to be under 100 μm. Originality/value Also, scanning electron microscopy, energy dispersive X-ray and X-ray diffraction analyses of the samples were investigated.

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Meuronen, Jaakko, Antti Mäntylä, Joona Vaara, Jouko Hintikka, Janne Juoksukangas, Arto Lehtovaara i Tero Frondelius. "Fretting test rig with variable normal force". Rakenteiden Mekaniikka 53, nr 4 (13.10.2020): 308–28. http://dx.doi.org/10.23998/rm.83573.

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Fretting is small amplitude reciprocating sliding between surfaces, and it may quickly causes surface cracks, which can continue growing under cyclic loads, until the structure breaks entirely as a result of the fretting fatigue. Fretting can also produce hardened wear particles as a result of adhesive wear, which then accelerates abrasive wear. In this case, the community uses the term fretting wear. The design of heavily loaded contacts, susceptible to fretting, is a difficult task because there is no generally accepted design guide. More extensive fretting research is needed to create them. This paper introduces detailed design phases for a equipment (rig) for a variable normal force fretting test. Supporting high radial and normal forces such that there is minimal run-out between the specimens was the most significant design challenge. The combination of a hydrostatic radial bearing and elastic torque shaft was selected for the detail design phase based on FE-analyses, calculations, and overall evaluation. The frame of the test rig consists of the main frame, which supports mainly the normal force and two torque frames, which support torque cylinders. Many solutions, which were found to be working in the current "ring-ring" apparatus of Tampere University, could be utilized in the new test rig like the tapered connections of the specimens, the elastic rod of the torque lever, axial displacement plate, and contact pressure adjustment system. The designed test rig enables fretting tests with 0 Hz to 20 Hz cycle frequency so that normal and tangential force or displacement can be controlled independently of each other. The normal force cannot change from compression to tension dynamically, but the adhesive force of the contact can be measured by slowly increasing the tension force. The designed fretting test rig fulfills all essential requirements, which were set.

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Furze, D. C., B. J. Griffiths i M. C. Carrey. "Wear Analysis Using a Quick Stop Device". Journal of Tribology 114, nr 3 (1.07.1992): 524–29. http://dx.doi.org/10.1115/1.2920914.

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This paper describes a new type of wear test rig which is based on a quick stop principle. The advantages of using such a rig and the associated testing method are described with respect to the analysis of prow formation.

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Dhokey, N. B., A. Raskar, A. R. Hake i G. Mohapatra. "Abrasive wear response of cryotreated EN45 steel in simulated wear test rig fixture". Tribology - Materials, Surfaces & Interfaces 9, nr 3 (3.07.2015): 159–64. http://dx.doi.org/10.1080/17515831.2015.1107240.

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Hammarsten, Åsa, i Sture Hogmark. "A high temperature test rig for sliding and rolling wear". Wear 115, nr 1-2 (marzec 1987): 139–50. http://dx.doi.org/10.1016/0043-1648(87)90205-5.

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Delaune, X., E. de Langre i C. Phalippou. "A Probabilistic Approach to the Dynamics of Wear Tests". Journal of Tribology 122, nr 4 (24.02.2000): 815–21. http://dx.doi.org/10.1115/1.1286257.

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Wear predictions of components belonging to pressurized water reactors require impact-sliding wear tests. Some scatter of the results have often been related to the complex dynamics of the test rig, which may be sensitive to small variations of parameters such as gaps or eccentricities. A probabilistic method is proposed here, which takes into account the actual dispersion of test parameters and the uncertainties on physical parameters for the computation of the test rig dynamics. The probability density function of wear work rate is used to assess the suitability of test parameters in terms of motion stability. An application of the method to some room temperature wear tests is presented. [S0742-4787(00)02403-6]

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Quintelier, Jan, Patrick de Baets, Joris Degrieck, Alessandro Ledda, W. Philips, Hugo Sol i Danny Van Hemelrijck. "On-Line Wear Monitoring of Polymer Matrix Composites". Materials Science Forum 475-479 (styczeń 2005): 1083–86. http://dx.doi.org/10.4028/www.scientific.net/msf.475-479.1083.

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The Laboratory Soete developed a new test setup, based on the well-known pin-on-disc test rig. Instead of the standard composite specimen and steel disc, a rotating composite disc and a steel pin is presently used to have a visible wear track. Other measurement techniques (Acoustic Emission, vibrations, temperature) can be used on the test rig. Continuous monitoring of the wear track combined with standard wear and friction measurements, give results of the current state of the wear track. Fourier frequency analysis (FFT) of these signals gives an indication of the change in condition and contact geometry of the resulting pin-disc combination. A high-speed camera will be used to acquire digital images of the worn composite surface. These online measurements yield to the gradual evolution in damage of the composite specimens.

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Tamatam, Lakshminarayana Reddy, Daniele Botto i Stefano Zucca. "A novel test rig to study the effect of fretting wear on the forced response dynamics with a friction contact". Nonlinear Dynamics 105, nr 2 (lipiec 2021): 1405–26. http://dx.doi.org/10.1007/s11071-021-06658-y.

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AbstractThis paper presents a novel test rig to study the effect of fretting wear and of the contact surface evolution on the forced response of systems with dry friction contact. This rig allows simulating contacts similar to the type of contacts present between the shrouds at the blade tip. Several research groups have been studying how fretting wear affects the dynamic response of mechanical systems, developing numerical prediction tools that consider dry friction contact and nonlinearity. The aim of this work is to experimentally study the evolution of contact interfaces and how this evolution affects the system dynamics. Experimental results will aid to validate the numerical predictions. The test rig developed for this activity is made of a cantilever beam fixed at one end and with a friction contact at the free end. The contact couple is made of two replaceable specimens. The contact is loaded via a lifting mechanism through a screw with fine thread. Fretting wear test was performed at a constant frequency and force amplitude, exciting the beam with an electromagnetic shaker. To emphasize the change of the dynamic response, frequency sweeps were performed at various intervals during the wear test. The full range test with ‘changing preload’ due to progressing wear was performed until a full loss of contact. This paper describes the test rig design, intent, set-up, instrumentation, test plan and results. Results include the frequency response curves for unworn contact, wear profiles at multiple intervals and the effect of wear on the frequency response. Though energy dissipation per cycle is quite small, wear leads to material loss at the contact with a sufficiently large number of cumulative cycles and substantially affects the dynamic response. Results collected in this research activity are of particular importance to validate numerical tool that aim to simulate the dynamic behaviour of systems with dry friction contacts that undergo material loss caused by wear.

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Rozprawy doktorskie na temat "Wear Test Rig"

Forsberg, Peter. "Combustion Valve Wear : A Tribological Study of Combustion Valve Sealing Interfaces". Doctoral thesis, Uppsala universitet, Tillämpad materialvetenskap, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-204636.

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The exhaust valve system of combustion engines experiences a very complex contact situation of frequent impact involving micro sliding, high and varying temperatures, complex exhaust gas chemistry and possible particulates, etc. In addition, the tribological situation in the exhaust valve system is expected to become even worse due to strict future emission regulations, which will require enhanced combustion and cleaner fuels. This will substantially reduce the formation of combustion products that might ease the contact conditions by forming tribofilms on the contacting surfaces. The lack of protective films is expected to result in increased wear of the contact surfaces. The aim of the work presented in this thesis has been to increase the tribological understanding of the valves. The wear that takes place in the valve sealing interface and how the change in operating conditions affects it have been studied. Such understanding will facilitate the development of future valve designs. A test rig has been developed. It has a unique design with the ability to insert ppm amounts of media into a hot air flow, in order to simulate different environmental changes, e.g. varying amount and composition of combustion residue particles. PVD coated valves were evaluated in a dry atmosphere. It was concluded that although some of the coatings showed potential, the substrate could not support the thin, hard coatings. Investigations with an addition of different oils have been performed. Fully formulated oils proved to build up a protective oil residue tribofilm. This tribofilm has been in-depth analysed and proved to have similar composition and appearance as tribofilms found on low wear field tested valves. With a non-additivated oil, wear particles from the valve seat insert formed a wear particle tribofilm on top of the valve sealing surface. Without any oil the surfaces showed severe wear with wear particles spread over the surfaces. The results presented give a hint about what to be expected in the future, when the engine oils are replaced with ash less oils with reduced amount of additives and the consumed amount of oil within the cylinders are reduced.

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Tekin, Koray Serdar. "Design And Construction Of Boundary Lubricated Bearing Test Rig And Wear Analysis In Earthmoving Machinery". Master's thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/12612751/index.pdf.

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Excavators which used as earthmoving machinery are exposed to heavy loads and operate long hours repeatedly. The forces that are transmitted trough pin bearings are observed to cause failure due to wear. Therefore, durability of bearings is crucial for excavators. The aim of this study is to perform wear analysis of excavator bearings running in boundary lubrication regime. A hydraulically powered test rig, which simulates the operating conditions of excavator bearings is designed and constructed. Wear is obtained applying both force and relative motion between pin and bearing on the test rig. Several tests are performed in this test bench. Force and material type are varied as the factors influencing wear. Results are compared and the effects of the factors on wear are determined.

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Gralde, Marcus, i Tómas Rúnar Sölvason. "Realisation and evaluation of a start-stop journal bearing test-rig". Thesis, KTH, Maskinkonstruktion (Inst.), 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-156713.

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While there has been substantial body of work in the field of journal bearing research, much of it is today theoretical or simulated due to today’s computing power. Scania produces experimental data from motor testing, but these are expensive and time consuming. Furthermore there is a difficulty in keeping a sufficiently controlled environment, which at times makes it hard to draw conclusions from testing results. They therefore wish to develop a test-rig which can evaluate friction and wear in journal bearings. This thesis is a continuation of a project in the course Advanced Machine Design given at KTH Royal Institute of Technology. During this thesis the test-rig has been manufactured, built, and evaluated. Furthermore software for the test-rig was developed. Information on journal bearings, risk assessment and signal noise handling were sought. Mechanical development was done with Autodesk Inventor, while Matlab was used for software development. Factorial design was utilised when designing tests and compared to a simple theoretical model. Test results showed promising results for Stribeck curve-producing tests, with good resemblance to known frictional values and trends. Furthermore the test-rig showed good repeatability for replicated tests and produced wear on the bearing shells used. During a prolonged test, the shaft and support-bearings were damaged and requires servicing to be in an operational state. The test-rig requires to be further verified, but the tests that were carried out showed valuable and reliable information on wear and frictional values. Keywords: journal bearing, hydrodynamic lubrication, wear, start-stop, test-rig
Även om en betydande mängd forskning inom glidlager och fullfilmslager har genomförts så är med dagens datorkapacitet en stor del av resultaten numera teoretiska eller simulerade. Medan Scania producerar experimentella resultat, så är dessa dyra och tidskrävande. Vidare är det ibland svårt att hålla en tillräckligt kontrollerad miljö för att dra slutsatser från proverna. Med en dedikerad testrigg som kan tillförlitliga resultat tas fram billigare och snabbare. Detta examensarbete är en fortsättning av kursen Avancerad Maskinkonstruktion som ges vid Kungliga Tekniska Högskolan. Under detta examensarbete har testriggen tillverkats, byggts och utvärderats. Vidare har programvara för testriggen utvecklats. Informationssökning gjordes på glidlager, fullfilmslager, riskbedömning och signalbrushantering. Mekanisk utveckling har gjorts i Autodesk Inventor, medan Matlab användes för mjukvaruutveckling. Faktorial design har nyttjats vid utformningen av tester. Resultaten jämfördes med en enkel teoretisk modell. Testresultaten visade lovade resultat för Stribeck kurva-producerande tester, med god likhet till kända friktionsvärden och trender. Testriggen visade god reproducerbarhet vid replikerade tester. Testriggen producerar slitage på samtliga testade lagerytor. Under ett längre test så har axel och stödlager skadats, varför service behövs för att testriggen skall vara i brukbart skick. Testriggen kräver ytterligare verifiering, men resultaten från de prov som genomförts visar att test-riggen ger värdefull och tillförlitlig information om slitage och friktion kunna utrönas. Nyckelord: glidlager, hydrodynamisk smörjfilm, nötning, start-stop, testrigg

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Carlsson, Björn. "Development and implementation of test rig for investigation of reciprocating polymeric journal bearing wear and friction in a controlled atmosphere". Ohio University / OhioLINK, 1992. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1172085651.

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Xinmin, Li. "Efficiency and wear properties of spur gears made of powder metallurgy materials". Doctoral thesis, KTH, Maskinkonstruktion (Inst.), 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-187446.

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Powder metallurgy (PM) is usually used in manufacturing parts with complex geometries, such as gears and structural parts. The main attractions of PM are the high rate of material utilization, environmental friendliness of production, economic advantages (especially for complex geometries), and possibility of obtaining lighter components. To find a wide range of applications and compete with regular steel gears, PM gear transmissions should have good transmission efficiency and wear properties. Furthermore, they should have low contact noise and adequate surface fatigue properties. Because of the porosity structure of PM gears both on gear flanks and in the body, the friction and wear properties of PM gear flank contacts differ somewhat from those of regular steel gears. This doctoral thesis examines the efficiency and wear properties of PM gears. Paper A compares the wear, friction, and damage mechanism properties of two sintered gear materials with those of a standard gear material. Paper B deals with the gear mesh torque loss mechanism of PM and regular steel gears by combining both pin-on-disc frictional and FZG efficiency tests. Paper C comparatively examines the efficiency of PM and regular steel gears by conducting FZG gear efficiency tests. Paper D focuses on the wear and friction properties of PM and regular steel gear materials treated using the triboconditioning process. Paper E studies the friction and wear properties attributable to different pore sizes in PM gear materials. The results indicate that regular steel meshed with PM gear material and PM meshed with PM gear material are good candidate combinations for gear transmissions. This is because the porosities of PM material can lower the friction coefficient while the wear rate can be the same as or even better than that of regular steel contacts. The triboconditioning process enhances the wear resistance and reduces the friction coefficient of the PM gear material. The friction and wear coefficients of PM meshed with PM gear material display increasing trends with increasing pore size. The friction and wear coefficients of regular steel meshed with PM gear material display decreasing trends with increasing pore size.

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Carlsson, Björn. "Development and implementation of test rig for investigation of reciprocating polymeric journal bearing wear and friction in a controlled atmosphere". Ohio : Ohio University, 1992. http://www.ohiolink.edu/etd/view.cgi?ohiou1172085651.

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Huq, Fazul, i dpmeng@bigpond com. "Development of Life Prediction Models for Rolling Contact Wear in Ceramic and Steel Ball Bearings". RMIT University. Aerospace, Mechanical and Manufacturing Engineering, 2007. http://adt.lib.rmit.edu.au/adt/public/adt-VIT20080215.145624.

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The potential for significant performance increases, using ceramic materials in un-lubricated rolling element bearing applications, has been the subject of research over the past two decades. Practical advantages over steel include increased ability to withstand high loads, severe environments and high speeds. However, widespread acceptance has been limited by the inability to predict wear life for ceramic bearing applications. In this thesis, the rolling contact wear of 52100 bearing steel and Over-aged Magnesia-Partially-Stabilised Zirconia (OA-Mg-PSZ) ceramic are examined using a newly developed rolling contact wear test rig. The new wear test rig simulates the system geometry of an un-lubricated hybrid (ceramic and steel) ball bearing. The new wear test rig is versatile in that it allows low cost samples to be utilised resulting in a larger number of samples that can be tested. Wear samples of 52100 bearing steel and OA-Mg-PSZ produced by the new wear test rig were examined for mass loss and wear depth. The wear behavior of both the steel and ceramic material showed a dependence on operating variables time and load. Load was varied between 300N to 790N. Typical mass loss after 1 hour of testing 52100 bearing steel at 790N was 0.03 grams as compared to OA-Mg-PSZ which was 0.001 grams. The rolling contact wear of the OA-Mg-PSZ was an order of magnitude lower than that of the 52100 bearing steel. The wear mechanism for 52100 bearing steel was typical of plastic deformation and shearing near and below the surface of rolling contact. Once cracks extend to reach the surface, thin flat like sheets are produced. In OA-Mg-PSZ the wear mechanism initially is that of plastic deformation on the scale of the surface asperities with asperity polishing occurring followed by lateral cracks and fatigue spallation. Results obtained using the new rolling contact wear test rig led to the establishment of a new equation for wear modeling of 52100 bearing steel and OA-Mg-PSZ ceramic materials.

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Blecha, Martin. "Návrh testovacího zařízení pro test opotřebení axiálních kloubů řízení". Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2018. http://www.nusl.cz/ntk/nusl-382264.

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This diploma thesis deals with the design of several variants of test rig for tests of axial ball joints of passenger cars. The individual design variants are evaluated based on the evaluation matrix and then the best option is selected. Selected proposal includes a complete design including 3D models and strength analyses that focus on the most stressed construction nodes. These design nodes are solved using the finite element method. Hydraulics and hydraulic elements are equipped by the existing equipment from a test lab. At the end of this thesis is solved risk analysis of the new construction and its economic evaluation.

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Kayatz, Fabian, i Ronald Claus. "Reibmessgerät zur Bestimmung des Gleitreibkoeffizienten von bahnförmigen Packstoffen". Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-178250.

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Kayatz, Fabian, i Ronald Claus. "Reibmessgerät zur Bestimmung des Gleitreibkoeffizienten von bahnförmigen Packstoffen". Rek & Thomas Medien AG, 2014. https://slub.qucosa.de/id/qucosa%3A7337.

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Książki na temat "Wear Test Rig"

United States. National Aeronautics and Space Administration., red. Test method to evaluate cylinder liner-piston ring coatings for advanced heat engines. [Washington, D.C: National Aeronautics and Space Administration, 1997.

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Części książek na temat "Wear Test Rig"

Sutaria, B. M., i D. V. Bhatt. "Optimization of Reciprocating Friction and Wear Test Rig Operating Parameters for Segmented Piston Ring: Liner Assembly". W Lecture Notes in Mechanical Engineering, 205–14. New Delhi: Springer India, 2013. http://dx.doi.org/10.1007/978-81-322-1656-8_18.

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Hemmer, Martin, Kjell G. Robbersmyr, Tor I. Waag, Rolf Albrigtsen, Torfinn Pedersen, Thomas J. J. Meyer i Chloë Vercammen. "Rib-Roller Wear in Tapered Rolling Element Bearings: Analysis and Development of Test Rig for Condition Monitoring". W Engineering Assets and Public Infrastructures in the Age of Digitalization, 750–57. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-48021-9_83.

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Macián, Vicente, Bernardo Tormos, Santiago Ruiz, Guillermo Miró i Isaac Rodes. "Test Rig Assessment of an On-Line Wear Sensor for Application in Wind Turbine Gearboxes". W Lecture Notes in Mechanical Engineering, 141–55. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-23597-4_11.

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Kumar, Amit, Shiv Ranjan Kumar i Anand Prakash. "Wear Analysis of Al-5083 Alloy Reinforced with Chromium Oxide Filler on Air Jet Erosion Test Rig". W Lecture Notes in Mechanical Engineering, 11–16. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-13-6412-9_2.

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Walter, A., i W. Plitz. "The Ring-On-Disc Method — Clinical Significance of a Wear-Screening Test of Biomaterials for Hip Joint Alloplasty". W Biomechanics: Current Interdisciplinary Research, 129–34. Dordrecht: Springer Netherlands, 1985. http://dx.doi.org/10.1007/978-94-011-7432-9_13.

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Tuszynski, Waldemar, Marek Kalbarczyk, Bartosz Kiser, Michal Michalak, Remigiusz Michalczewski, Jerzy Mydlarz, Witold Piekoszewski, Marian Szczerek i Jan Wulczynski. "Testing of the Resistance to Scuffing of Spiral Bevel Gears: Test Rig, Method, and Results of Verification Testing". W Friction, Lubrication and Wear. IntechOpen, 2019. http://dx.doi.org/10.5772/intechopen.84848.

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"Block-on-Ring Wear Tests". W Encyclopedia of Lubricants and Lubrication, 182. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-22647-2_100075.

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Ruiz-Andrés, M., A. Conde, J. de Damborenea i I. García. "Wear Behavior of Aluminum Alloys at Slow Sliding Speeds". W Encyclopedia of Aluminum and Its Alloys. Boca Raton: CRC Press, 2019. http://dx.doi.org/10.1201/9781351045636-140000449.

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The investigated slow sliding speeds presented in this work enable the understanding of the wear behavior on aluminum alloys and could possibly facilitate the completion of the previously proposed wear mechanism map for aluminum at this slow sliding speed range. Dry sliding block-on-ring wear tests were carried out on aluminum alloys, AA5754 (Al-Mg), AA6082 (Al-Mg-Si), and AA7075 (Al-Zn-Cu), at a very slow sliding speed range (<0.01 m/s). A bearing steel ring of AISI 52100 was used as the counterbody. Tests were performed at varying contact pressures, 20, 100, and 140 MPa, and sliding speeds ranging from 0.001 to 1.5 m/s. The wear tracks and debris collected were examined by scanning electron microscopy (SEM), energy-dispersive spectroscopy (EDS), and X-ray diffraction (XRD), with the aim of analyzing their morphology and composition. At relatively slow sliding speeds (>0.01 m/s), the specimens exhibited a wear process placed at the mild wear regime, characterized by oxidation and delamination mechanisms of both the aluminum specimen and the steel ring. However, at very slow speed range (<0.01 m/s), an increase in the wear rate and the friction coefficient is observed for all of the aluminum alloys, thus suggesting that an alternative wear mechanism could be taking place.

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"ASTM Block-on-Ring Friction and Wear Test Machine". W Encyclopedia of Lubricants and Lubrication, 104. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-22647-2_100039.

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Deleanu, Lorena, Mihail Botan i Constantin Georgescu. "Tribological Behavior of Polymers and Polymer Composites". W Tribology [Working Title]. IntechOpen, 2020. http://dx.doi.org/10.5772/intechopen.94264.

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This chapter means to explain the tribological behavior of polymer-based materials, to support a beneficial introducing of those materials in actual applications based on test campaigns and their results. Generally, the designers have to take into consideration a set of tribological parameters, not only one, including friction coefficient, wear, temperature in contact, contact durability related to application. Adding materials in polymers could improve especially wear with more than one order of magnitude, but when harder fillers are added (as glass beads, short fibers, minerals) the friction coefficient is slightly increased as compared to neat polymer. In this chapter, there are presented several research studies done by the authors, from which there is point out the importance of composite formulation based on experimental results. For instance, for PBT sliding on steel there was obtained a friction coefficient between 0.15 and 0.3, but for the composite with PBT + micro glass beads, the value of friction coefficient was greater. Adding a polymer playing the role of a solid lubricant (PTFE) in these composites and also only in PBT, decreased the friction coefficient till a maximum value of 0.25. The wear parameter, linear wear rate of the block (from block-on-ring tester) was reduced from 4.5 μm/(N⋅km) till bellow 1 μm/(N⋅km) for a dry sliding regime of 2.5…5 N, for all tested sliding velocities, for the composite PBT + 10% glass beads +10% PTFE, the most promising composite from this family of materials. This study emphasis the importance of polymer composite recipe and the test parameters. Also there are presented failure mechanisms within the tribolayer of polymer-based materials and their counterparts.

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Streszczenia konferencji na temat "Wear Test Rig"

Hiratsuka, K., i T. Yoshida. "Wear Characteristics of Metals Using Disk on Disk Type Wear Test Rig". W World Tribology Congress III. ASMEDC, 2005. http://dx.doi.org/10.1115/wtc2005-64069.

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Wear of metals is influenced by many factors such as material, surrounding atmosphere and sliding conditions. Besides these factors, type of the wear test also has a significant effect on wear results. For example, when pin on disk test rig is used, wear of disk is usually more than that of pin [1]. This is because the contact time of each specimen is asymmetric. In this case, the transfer particle at the tip of the pin protects pin against wear. So the wear of dissimilar metals depends on the pin-disk combination. In order to fully characterize the adhesive wear, we have developed a disk on disk type test rig [2]. In this rig, the circumferential surfaces of the two identical disks are in sliding contact thereby resulting in a symmetrical contact. In this paper, the wear characteristics of ten different metals sliding against emery paper as well as against themselves have been presented along with the wear of 43 dissimilar metal combinations.

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Pauschitz, A., M. Jech, J. Ebrecht i T. Lebersorger. "Investigation of Influence of Inclination on Friction and Wear Mechanisms in Piston Ring Cylinder Liner Contact With the New SRV® 4 Test Rig". W World Tribology Congress III. ASMEDC, 2005. http://dx.doi.org/10.1115/wtc2005-63520.

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Due to the high demand for wear and friction tests in industry, caused by high costs of field tests, preceding experiments with a model test rig like the SRV®3 test rig is common practice. With earlier SRV test rigs only horizontal movement of the test sample can be realized, thus effects of oil adhesion and wear particle removal can be significantly different to real applications. Using the new SRV®4 [1] up to 90° inclination of the tribological interacting surfaces is possible. To isolate the effects of inclination on lubrication conditions and wear particle concentration, experiments with different parameters and samples have been made (e.g. piston ring cylinder liner contact). Diverse sample material, fresh oil and artificially aged oil were used. To investigate different oil conditions in the tribocontact selected experiments with and without oil circuit were made. The oil alterations during the model tests were determined by infrared spectroscopy (IR) and by inductive coupled plasma atomic emission spectroscopy (ICP-AES). The friction coefficient and the wear rate measured during the experiments and the surface topography of the samples measured by confocal microscopy after the test run showed strong dependence on inclination.

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Janzen, V. P., B. A. W. Smith, N. J. Fisher, C. E. Taylor i T. Whan. "Flow-Induced Vibration Tests of Research Reactor Fuel in the Chalk River Single Channel Test Rig". W ASME 2014 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/pvp2014-28803.

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A series of out-reactor vibration and endurance tests have been carried out in support of design changes for nuclear fuel used in a 30 MWt research reactor. Vibration frequencies and amplitudes were measured in and out of flow, and the effect of proposed design changes on vibration levels was determined. Component wear was measured following endurance tests, and the fretting-wear performance was predicted for extended periods of time in operation. Based on the calculated maximum wear depth versus time, external wear of bundle wear pads due to flow-induced vibration is not expected to affect the function of the fuel-bundle endplates and spacers. Various aspects of this work are generally applicable to similar tests of power-reactor and other research-reactor fuel.

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Lavella, M., D. Botto i M. M. Gola. "Test Rig for Wear and Contact Parameters Extraction for Flat-on-Flat Contact Surfaces". W ASME/STLE 2011 International Joint Tribology Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/ijtc2011-61234.

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In aircraft engine the blade resonant vibration amplitude is reduced by increasing the structural damping by using, for example, tip shrouds. These devices dissipate the energy generated at the contact surfaces between the relative motion and the friction force. Contact parameters as friction coefficient and contact stiffness are required to characterize the dynamics of the shrouded blade systems. Moreover if at the contact surfaces severe wear occurs a loss of interference takes place, the shroud is not longer able to dissipate energy and a catastrophic blade failure could take place. A test rig for contact parameters measurement and micro wear characterization of flat-on-flat contact surfaces has been developed. One of the specimens is attached to the rig frame, basically an inertial mass and four springs, excited by an electromagnetic shaker. The second specimen is allowed to approach the first specimen and to rotate in such a way the geometric contact between the two surfaces occurs on three points. In this way a real “flat-to-flat” contact has been obtained. The tangential contact force and the relative displacements between specimens are measured and the friction coefficient and contact stiffness, are determined. The expected results are the contact parameters and the wear behaviour of real flat-on-flat contact surfaces. The aim of this work is to describe the design principle of the test rig and show the first measurements.

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Forsberg, Peter, Patrik Hollman i Staffan Jacobson. "Wear Study of Coated Heavy Duty Exhaust Valve Systems in a Experimental Test Rig". W SAE 2012 World Congress & Exhibition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2012. http://dx.doi.org/10.4271/2012-01-0546.

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Souilliart, Thibaut, Emmanuel Rigaud, Alain Le Bot i Christian Phalippou. "Wear Induced by Stochastic Sliding Impacts". W ASME 2015 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/pvp2015-45811.

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Vibrations of the steam generator tubes in nuclear power plants induce stochastic impacts between the tubes and their supports. As a consequence, wear is generated. A test rig is designed and used to perform impacts between two metal crossed cylinders with various incidence angles and impact velocities. The normal and tangential components of the contact load are measured during the tests. Rate and duration of impacts, instantaneous ratio between normal and tangential loads for each impact are deduced. Influence of incidence angle and impact velocity on impact duration, ratio between tangential and normal loads during impact and wear volume is highlighted.

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Ost, W., i P. De Baets. "The Frictional Stability of Wet Clutch Friction Materials Investigated on a Small Scale Test-Rig". W World Tribology Congress III. ASMEDC, 2005. http://dx.doi.org/10.1115/wtc2005-63514.

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The work presented in this paper is part of a European project (COST 532, project E2) to study clutch shudder and its influences, together with wear testing of clutch materials. The relation between the friction force and the relative velocity, and the dynamics thereof are investigated for typical wet clutch materials (oil lubricated paper/steel contact) on a small scale test rig, using a ground and polished steel ring onto which a coupon from a friction clutch plate was slid. The results clearly show that although momentarily the relative velocity of the sliders vs. the rotating ring reaches zero, no stick episode ensues. The mechanical parameters (stiffness, damping and normal load) of the test-rig were varied and the influence thereupon on the friction during sliding was investigated.

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Mühlbauer, Moritz, Paul U. Thamsen, Jan Liersch, Julian Michael i Maik Wagner. "Construction of a Rain Erosion Test Rig for Wind Energy Blade Coatings". W ASME 2018 5th Joint US-European Fluids Engineering Division Summer Meeting. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/fedsm2018-83505.

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Wind turbine blades are constantly exposed to weather conditions, which wear and degrade the surface [1]. Depending on the site of the plant, rain is the main driver for this wear. This rain erosion becomes apparent, when the coating — usually on the leading edge — shows a rough surface or even the bare GFRP looms. Increased surface roughness usually goes along with diminished performance. This surface erosion occurs mostly near the tips of the blades, where most power is converted. Maintenance teams replace the damaged coatings in costly rope-based operations. To extend maintenance intervals and select the best coating, better understanding of the loads and the non-linear development of erosion damage is necessary. Therefore a test rig to simulate realistic erosion loads is constructed. The velocity between the surface and the droplet is created by a rotating arm with a vertical axis and a stationary nozzle in one side, similar to the rotating arm apparatus in [2], but much smaller. Our approach is to use relative velocities between droplets and coating which are comparable to the ones seen on wind turbines, as well as a realistic droplet size distribution [3] and ambient pressure. Rotational speed, temperature, vibrations, flow rate, electric voltage and current are constantly measured to ensure safe operation and repeatable measurements.

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Rathmann, Ulrich, Sven Olmes i Alex Simeon. "Sealing Technology: Rub Test Rig for Abrasive/Abradable Systems". W ASME Turbo Expo 2007: Power for Land, Sea, and Air. ASMEDC, 2007. http://dx.doi.org/10.1115/gt2007-27724.

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Performance and efficiency optimization is one of the major tasks in the turbo machinery industry. Therefore efforts for scientific and technical improvements focus on optimization and reduction of losses. Secondary losses are of major interest because of their parasitic character related to stage efficiency and power output. One of these losses is over tip leakage of blades. Common practice is a minimization of this clearance with abrasive/abradable combinations. With this technique the blade tip (abrasive material) can rub into its counterpart (heat-shield, abradable material on casings or liners) and therefore minimize the operating tip-clearance. This technology is well established in compressor and turbine engineering since many years [1]. Field experience shows that abrasive/abradable systems do not always work as intended. In some cases rubbing conditions are reversed so that the intended abradable cuts into the abrasive. Any benefit on operating tip-clearance will then be minor at best or even negative. Rubbing behavior is difficult to predict, especially for new materials or geometries where no experience is available. In close cooperation with the University of Applied Sciences Rapperswil (Switzerland), ALSTOM has developed a test rig that allows simulating engine-operating conditions and therefore evaluate abrasive/abradable combinations before actual implementation into an engine. The rig is designed to reproduce circumferential velocities and incursion rates that are typical for gas turbine engines in the compressor as well as in the turbine. Forces and temperatures are measured as quantitative data, visual appearance and metallographic condition of test specimens are recorded as qualitative data that allow a more detailed assessment of material combinations and operating conditions. This paper describes the design of a high-speed wear rig facility to test single blade and fully shrouded rub configurations. In addition the validation of the test rig against real engine experience and knowledge is shown.

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Pacyna, Laura, Alexandre Bertret, Alain Derclaye, Luc Papeleux i Jean-Philippe Ponthot. "Implementation of a Rig Test for Rotor/Stator Interaction of Low-Pressure Compressor Blades and Comparison of Experimental Results With Numerical Model". W ASME Turbo Expo 2020: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/gt2020-14266.

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Abstract To investigate the contact phenomenon between the blade tip and the abradable coated casing, a rig test was designed and built. This rig test fills the following constraints: simplification of the low-pressure compressor environment but realistic mechanical conditions, ability to test several designs in short time, at low cost and repeatability. The rig test gives the opportunity to investigate the behavior of different blade designs regarding the sought phenomenon, to refine and mature the phenomenon comprehension and to get data for the numerical tool validation. The numerical tool considers a 3D finite elements model of low-pressure compressor blades with a surrounding rigid casing combined with a specialized model to take into account the effects of the wear of the abradable coating on the blade dynamics. Numerical results are in good agreement with tests in terms of: critical angular speed, blade dynamics and wear pattern on the abradable coated casing.

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Raporty organizacyjne na temat "Wear Test Rig"

Blau, P. J. A Review of Sub-Scale Test Methods to Evaluate the Friction and Wear of Ring and Liner Materials for Spark- and Compression Ignition Engines. Office of Scientific and Technical Information (OSTI), styczeń 2002. http://dx.doi.org/10.2172/814479.

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