Proceedings of SerbiaTrib '13

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M fr / T [-]10.90.80.70.60.50.40.30.20.10t 0=5.3 st st=14.8 st ps'=8.2 st 1=18.95 s0 2 4 6 8 10 12 14 16 18 20 22 24 26t [s]Figure 21. Ratio M fr /T: CWT, n=600 rpm, d 0 =0 mm [-]43.532.521.510.5t 0=t ps' =7.8 st st=12.25 st 1=15.8 s00 2 4 6 8 10 12 14 16 18 20 22 24t [s]Figure 22. Friction coefficient: CWT, n=910 rpm, d 0 =5 mmM fr / T [-] [-]10.90.80.70.60.50.40.30.20.10t 0 =t ps' =7.8st st=21.15 st 1=24.3 s0 2 4 6 8 10 12 14 16 18 20 22 24t [s]Figure 23. Ratio M fr /T: CWT, n=910 rpm, d 0 =5 mm1.210.80.60.40.20t 0=t pt=5.6 st ps'=9.4 st st=19.9 st 1=24.7 s0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30t [s]Figure 24. Friction coefficient: CWT, n=910 rpm, d 0 =3.2 mmM fr / T [-]10.90.80.70.60.50.40.30.20.10t 0=t pt=5.6 st ps'=9.4 st st=19.9 st 1=24.7 s0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30t [s]Figure 25. Ratio M fr /T: CWT, n=910 rpm, d 0 =3.2 mm [-]2.62.42.221.81.61.41.210.80.60.40.20t 0=t pt=6.2st st=31.4 st ps'=20.5 st 1=35.8 s0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 3032 34 36 38 40t [s]Figure 26. Friction coefficient: CWT, n=910 rpm, d 0 =2 mmM fr / T [-]10.90.80.70.60.50.40.30.20.10t 0=t pt=6 .2 st st=31.4 st ps'=20.5 st 1=35.8 s0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40t [s]Figure 27. Ratio M fr /T: CWT, n=910 rpm, d 0 =2 mm1.2t ps'=11.5 s1t 0=t pt=5.5t st=21.05 s [-]0.80.60.40.20st 1=26.05 s4 6 8 10 12 14 16 18 20 22 24 26 28 30 32t [s]Figure 28. Friction coefficient: CWT, n=910 rpm, d 0 =0 mm394 13 th International Conference on Tribology – Serbiatrib’13
M fr / T [-]10.90.80.70.60.50.40.30.20.10t 0=t pt=5.5 st ps'=11.5 st st=21.05 st 1=26.05 s0 2 4 6 8 10 12 14 16 1820 22 24 26 28 30 32t [s]Figure 29. Ratio M fr /T: CWT, n=910 rpm, d 0 =0 mmMeasured values of torque and forces were usedfor calculating values of the friction coefficient andratio of momentum of friction and the torque(Figure 6 to Figure 29).6. DISCUSSION AND CONCLUSIONSThe first set of experiments with the“theoretical” welding tool has shown that weldingtool without thread at the probe can not be used forwelding of 2024 T351 alloy. Plunging of thewelding tool into workpieces was possible onlywhen diameter of the welding tool was the same asthe diameter of the technological hole in theworkpieces. During such experiment, appeared thatfriction coefficient, after initial stabilization,reaches almost constant value between 0.3 to 0.4what is prescribed value for the FSW of AL 2024T351 and the “theoretical” welding tool [1]. Theratio of momentum of friction and the appliedtorque has a value of 1 – there is no (or hasminimal) deformation in the contact.The conclusion was that the plunging of the“theoretical” welding tool in welding plates wasimpossible when small or no technological holepresent what implies that welding couldn't even getstarted.The second set of experiments was conductedwith the coned, threaded welding tool with theprescribed technological parameters. Welding waspossible, however, only welding with n=910 rpmhas given the qualitative welds. During allweldings, trends and values of the frictioncoefficient were identical. Friction coefficient wasrising from the beginning of the plunging until themoment of time when the shoulder tip involves inthe welding. Common values of maximal frictioncoefficient reach about 1 but it is not uncommon toreach values of 2-5 (what is in correspondence withthe literature-present values [1-4] but it is possibleto have peak values as imperfections of theproposed method for estimation). From thatmoment, friction coefficient drops down and at thebeginning of the first dwelling phase reaches valueof about 0.2 to 0.7. However, at the end of thedwelling phase, friction coefficient in allexperiments reaches the values of 0.2 to 0.5.The ratio between the momentum of friction andthe applied torque has the same trend for allexperiments. It rises up to the maximal value of 1and varies from 0.8 to 1, during every conductedexperiment. The results are in agreement with theexisting results [2, 3, 4].LITERATURE[1] Mijajlović, M., Investigation and Development ofAnalytical Model for Estimation of Amount of HeatGenerated During FSW (in Serbian), Ph. D. thesis,Faculty of Mechanical Engineering Nis, Universityof Nis, Nis, Serbia, 2012.[2] V. Soundararajan, M. Valant, R. Kovačević: AnOverview of R&D Work in Friction Stir Welding atSMU, MJoM, Metalurgija – Journal of Metallurgy,Association of Metallurgical Engineers of Serbia,204, 12, pp. 277-295, 2006.[3] M. Djurdjanović, M. Mijajlović, D. Milčić, D.Stamenković: Heat Generation During Friction StirWelding Process, Tribology in Industry, 1-2, pp. 8-14, 2009.[4] K. Kumar, C. Kalyan, S.V. Kailasa, T.S. Srivatsan:An Investigation of Friction during Friction StirWelding of Metallic Materials, Materials andManufacturing Processes, 24, pp. 438-445, 2009.[5] M. Mijajlović, D. Stamenković, D. Milčić,M. Đurdanović: Study About Friction CoefficientEstimation in Friction Stir Welding, Balkantrib 11,The 7th International Conference on Tribology,Proceedings, Thessaloniki, Greece, pp. 323-330,2011.[6] M. Mijajlović, D. Milčić, B. Anđelković,M. Vukićević, M. Bjelić: Mathematical Model forAnalytical Estimation of Generated Heat DuringFriction Stir Welding. Part 1, Journal of BalkanTribological Association, 17, pp. 179-191, 2011.[7] P. Ulysse: Three-Dimensional Modeling of theFriction Stir-Welding Process, Int. J. Mach. Tool.Manu. 42, pp.1549-1557, 2002.[8] H. Schmidt, J. Hattel, J. Wert: An Analytical Modelfor the Heat Generation in Friction Stir Welding,Modeling Simul. Mater. Sci. Eng. 12,pp. 143-157, 2004.[9] M. Mijajlović, D. Milčić, B. Anđelković,M. Vukićević, M. Bjelić: Mathematical Model forAnalytical Estimation of Generated Heat DuringFriction Stir Welding. Part 2, Journal of BalkanTribological Association, 17, pp. 361-370, 2011.13 th International Conference on Tribology – Serbiatrib’13 395
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SerbianTribologySocietyFacultyofEng
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Serbian Tribology SocietyUniversity
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Supported byMinistry of Education,
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PrefaceThe International Conference
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ContentsPlenary Lectures1. THE GREE
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27. WEAR CHARACTERISTICS OF HYBRID
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Tribometry57. PRELIMINARY STUDY ON
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Plenary Lectures13 th International
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Serbian TribologySocietySERBIATRIB
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Figure 4. Diagram of the height and
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Realization of the approach is base
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edge without chamfer and smaller ra
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Figure 7. Accumulated tool life in
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Figure 13. Calculated and measured
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Friction deformation of the bronze
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engine cylinders of 2-cylinder-twot
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Table 1: Chemical composition of sa
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Table 4: Comparative wear-resistanc
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- measuring of coating thickness h
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Figure 5. Functional scheme of the
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Table 2. Test results for massive w
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knowledge transfer in the field ofm
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Table 1. Parameters of the electroc
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Figure 6. Wear resistance by linear
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coatings and observed their good we
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c)a)Figure 2: SEM images and micros
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Room temperature 300°CNi/µSiCNiNi
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COF [-] COF [-]Fig.9: COF graphs at
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about 260 nm is related to isolated
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contact’s conformity [18] they ob
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In order to calculate the metallic
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microscopic inspection of the Rp3 s
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otating plate. The shaft passes thr
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similar trends of variation are obs
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smooth, gear fiber-mild steel rough
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[2] Tabor, D.: “Friction and wear
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(10, 50 and 100 N) against surface
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[9] B.R. Gligorijevic, A. Vencl, B.
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dielectric properties, high resista
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parameter, Sv, was slightly influen
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dependence of roughness height and
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Polyethylenes with a molecular weig
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[9] K.S. Kanaga Karuppiah, A.L. Bru
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MgCO3•CaCO3 (13% Mg), and carnall
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fully compatible with MRI/MSCT imag
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5. CONCLUSIONThe magnesium alloys a
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Zinc dialkyldithiophosphate (ZDDP)
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C- Lower deposits with NPNA on comb
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films. Carraro et al. [10] examined
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PlateCount No.Critical Load ( N)120
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solid melt of ZA27 alloy using mech
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SiC particles are uniformly distrib
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in number of micro-cracks and clust
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PBT has the average values of the f
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mechanical pressure and thermal loa
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3. EXPERIMENTAL RESULTSTaking into
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[12] L. Blunt De, X. Jiang: Advance
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2. EXPERIMENTALTESTING2.1 MaterialT
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figure 3a it could be seen that the
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and lubrication is done so that the
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5. CONCLUSIONFigure 11. The accumul
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esistance was found for composite c
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onze, which is embedded within the
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The test contact pair meets the req
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complete. The SEM analysis maycontr
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tg( ) tg 100, [%] (2)tgwhere are:
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corresponding to the maximum value
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electrostatics [17]. Due to the fle
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250nm size have been observed, acco
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ETH Zurich, Switzerland, where all
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comparison with the synthetic reinf
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3. RESULTS AND DISCUSSION3.1 Micros
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(a)(b)Figure 4. Showing (a) variati
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composites. But the composite compo
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coated and uncoated region after ad
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has been measured between the top s
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Fig. 9 shows the wear track obtaine
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Mica samples preparationFor the ads
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According to the AFM results in fig
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[21] B. G. Sharma et al.: Character
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chemical vapor deposition method wi
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analysis (a) and an approximate che
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Table 3. Friction coefficients of s
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A.K.Oleynik, V.M.Matsevity, ea.]. /
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Most of the friction units of produ
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In order to provide both high parts
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Fig. 3. The comparison the criterio
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Table 3. Experimental and calculate
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For developing the numerical model
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,eccentricities and hydrodynamic pr
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hydrodynamic regime. However, for b
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to obtain the temperature distribut
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force (pressure) between two contac
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5E-06The total displacement [m]4.5E
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[11]. Figure 5 shows s the influenc
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efficiency of use, product quality,
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38GSA. The chemical composition, de
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niobium. It should be noted that fo
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Figure 1. Friction force on side su
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exploitation this changing is signi
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2. EFFICIENCY OF CYCLO DRIVEEfficie
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Figure 6. Dependence of cyclo drive
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common for their ability to be inst
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FNF (11)R sin cos11 21 22FNF
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Normal force [N]4000350030002500200
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analytical tests. The analytical te
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Table 4. Results of zero samples of
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noticeable, and by the end of explo
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4. PLASTIC BEARING APPLICATIONSRega
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For Elastohydrodynamic film thickne
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The results concluded for different
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For Thrust Force of 40KNKrytox 215
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Krytox 215 (µ = 0.03204 Pa.s)Figur
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- Reliable exploitation tools, prim
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In addition, as a result of cyclic
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AcknowledgementThe part of this res
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Thepressure angle can be calculated
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mechanism these parameters are fina
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causes big changes of their propert
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Table 2. Impact toughness of some t
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Figure 1. Appearance of fractured f
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implementation of these new manugac
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additional energy is dissipated due
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The adopted geometry parameters are
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4. CONCLUSIONTools of virtual produ
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Figure 2. Structure of the machinin
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3. ANALYSIS OF RESULTSThe results o
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Figure 15. Surface roughness regard
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From the analysis of the diagram it
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comparison from economic, energy co
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Advantages and disadvantages of tra
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The information provided by footwea
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Force (N)5,554,543,532,521,510,50Ex
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additives, that had been, until rec
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Figure 1. Test results for samples
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Table 7. Test results of oil sample
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Input parameters- Current intensity
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edge formed into a thin line. At th
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Lower values of current are not res
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Table 1. Chemical composition of si
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flowable at high temperatures and v
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holes (pits) emerge in the shape of
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[4] W. Schatt, K-P. Wieters, Pulver
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assumption allows us to use, instea
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where P is the load, a - radius of
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determination (total running in tim
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μm, compared with Figure 17, wich
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Serbian TribologySocietySERBIIATRIB
Page 357 and 358: Especially when the chain transfer
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Page 367 and 368: each of which is measured by the le
Page 371 and 372: Fractal dimensions were determined
Page 375 and 376: Figure 3. Modified force acting sch
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Page 381 and 382: 4. RESULTS AND DISCUSSION4.1 Morpho
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Page 389 and 390: The material after qualifying the r
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Page 393 and 394: Degradation & Stability, Vol. 69, N
Page 395 and 396: conformance to researchers’ requi
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Page 399 and 400: matrixes describe the state of the
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Page 403 and 404: Figure 1. Friction stir weldinga -
Page 405 and 406: (t 2 t
Page 407: M fr / T [-] [-]10.90.80.70.60.50.4
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Page 413 and 414: 4. DISCUSSIONAccording to the theor
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Page 425 and 426: uticaja na osnovu kompozita, a time
Page 427 and 428: 5. ZAKLJUČCIStruktura tiksolivene
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Page 431 and 432: vizuelno, na dnevnoj svetlosti, pod
Page 433 and 434: LITERATURA[1] Зинченко В.
Page 435 and 436: Slika 1. Rotorni bager - glodar VII
Page 437 and 438: stvaraju sliku stanja i svoja zapa
Page 439 and 440: njihovih kotrljanih elemenata. Mere
Page 441 and 442: postupka i uticaja parametara depoz
Page 443 and 444: posledica različite raspodele mikr
Page 445 and 446: ZrO 2 Y 2 O 3 je takođe zbog oksid
Page 449 and 450: 3.2 Pneumatska osetljivostOblast pr
Page 451 and 452: p mg (δ), koji je zbog malih struj
Page 453 and 454: PNEUMATIC PROBE HEAD SELECTION FOR
Page 455 and 456: 1. Podsistem kopanja2. Podsistem pr
Page 457 and 458: Slika 3. Kriva habanjaNa tom dijagr
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Mjereni su parametri habanja i pril
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preše prevladavaju kombinirani uvj
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a) b)Slika 5. Karakteristična mikr
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varijantnih materijala u dostavnom
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Jovanović D. 414, 446KKaleicheva J
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CIP - Каталогизација
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