fiber and glass fiber sliding against smooth mildsteel counterface is lower than that <strong>of</strong> gear fiber andglass fiber sliding against rough mild steelcounterface.Variations <strong>of</strong> wear rate with sliding velocity forgear fiber and glass fibre mating with smooth orrough mild steel counterfaces are presented in Fig.13. Curves show the variation <strong>of</strong> wear rate from1.167 to 1.778, 1.433 to 2.25, 1.258 to 1.95 and1.987 to 2.78 mg/min with the variation in slidingspeed from 1 to 3 m/s for gear fiber-mild steelsmooth, gear fiber-mild steel rough, glass fibermildsteel smooth and glass fiber-mild steel roughsliding pairs respectively. From these curves, it isobserved that wear rate increases with the increasein sliding speed for all types <strong>of</strong> materialcombinations. These findings are in agreement withthe findings <strong>of</strong> Mimaroglu et al and Suresha et al.[27,38]. This is due to the fact that duration <strong>of</strong>rubbing is same for all sliding velocities, while thelength <strong>of</strong> rubbing is more for higher slidingvelocity. The reduction <strong>of</strong> shear strength <strong>of</strong> thematerial and increased true area <strong>of</strong> contact betweencontacting surfaces may have some role on thehigher wear rate at higher sliding velocity [51].Figure 13 also shows the comparison <strong>of</strong> thevariation <strong>of</strong> wear rate with sliding velocity fordifferent sliding pairs. From the obtained results, itcan also be seen that the highest values <strong>of</strong> the wearrate are obtained for glass fiber-mild steel roughpair and the lowest values <strong>of</strong> wear rate are obtainedfor gear fiber-mild steel smooth pair. The values <strong>of</strong>wear rate <strong>of</strong> gear fiber-mild steel rough pair andglass fiber-mild steel smooth pair are found inbetween the highest and lowest values. It is notedthat the wear rates <strong>of</strong> gear fiber-mild steel roughpair are higher than that <strong>of</strong> glass fiber-mild steelsmooth pair.Wear rate (mg/min)3.02.52.01.51.00.5gear fiber-mild steel, smooth pairgear fiber-mild steel, rough pairglass fiber-mild steel, smooth pairglass fiber-mild steel, rough pair0.00.5 1.0 1.5 2.0 2.5Sliding velocity (m/s)Fig. 13. Wear rate as a function <strong>of</strong> Normal load for gearand glass fiber for different counterface surfaceconditions (normal load: 15 N, relative humidity: 70%).From this figure, it is also found that at identicalconditions, the values <strong>of</strong> wear rate <strong>of</strong> gear fiber andglass fiber sliding against smooth mild steelcounterface is lower than that <strong>of</strong> gear fiber andglass fiber sliding against rough mild steelcounterface. It is due to the fact that rough surfacesgenerally wear more quickly and have higherfriction coefficients than smooth surfaces.4. CONCLUSIONThe presence <strong>of</strong> normal load and sliding velocityindeed affects the friction force considerably.Within the observed range, the values <strong>of</strong> frictioncoefficient decrease with the increase in normalload while friction coefficients increase with theincrease in sliding velocity for gear fiber and glassfiber sliding against smooth or rough mild steel pin.Friction coefficient varies with the duration <strong>of</strong>rubbing and after certain duration <strong>of</strong> rubbing,friction coefficient becomes steady for the observedrange <strong>of</strong> normal load and sliding velocity. Wearrates <strong>of</strong> gear fiber and glass mating with smooth orrough mild steel counterface increase with theincrease in normal load and sliding velocity. Thehighest values <strong>of</strong> the friction coefficient areobtained for glass fiber-mild steel rough pair andthe lowest values <strong>of</strong> friction coefficient are obtainedfor gear fiber-mild steel smooth pair. The values <strong>of</strong>friction coefficient <strong>of</strong> gear fiber-mild steel roughpair and glass fiber-mild steel smooth pair arefound in between the highest and lowest values.The friction coefficients <strong>of</strong> gear fiber-mild steelrough pair are higher than that <strong>of</strong> glass fiber-mildsteel smooth pair. At identical conditions, thevalues <strong>of</strong> friction coefficient <strong>of</strong> gear fiber and glassfiber sliding against smooth mild steel counterfaceis lower than that <strong>of</strong> gear fiber and glass fibersliding against rough mild steel counterface.As (i) the friction coefficient decreases with theincrease in normal load (ii) the values <strong>of</strong> frictioncoefficient increase with the increase in slidingvelocity (iii) wear rate increases with the increasein normal load and sliding velocity and (iv) themagnitudes <strong>of</strong> friction coefficient and wear rate aredifferent for smooth and rough counterface pins andtype <strong>of</strong> materials, therefore maintaining anappropriate level <strong>of</strong> normal load, sliding velocity aswell as appropriate choice <strong>of</strong> counterface surfacecondition and tested materials, friction and wearmay be kept to some lower value to improvemechanical processes.REFERENCES[1] Archard, J.F.: “Wear theory and mechanisms”,Wear Control Handbook, ASME, New York, NY,1980.72 13 th International Conference on Tribology – Serbiatrib’13
[2] Tabor, D.: “Friction and wear – developments overthe last 50 years, keynote address”, <strong>Proceedings</strong> <strong>of</strong>the International Conference <strong>of</strong> Tribology –Friction, Lubrication and Wear, Queen Elizabeth IIConference Centre, London,Institute <strong>of</strong> MechanicalEngineering, London, pp. 157-72, 1987.[3] Kukureka, S.N., Chen, Y.K., Hooke, C.J. and Liao,P.: “The wear mechanisms <strong>of</strong> acetal inunlubricatedrolling-sliding contact”, Wear, Vol.185, pp. 1-8, 1995.[4] Chowdhury, M.A. and Helali, M.M.: “The effect <strong>of</strong>amplitude <strong>of</strong> vibration on the coefficient <strong>of</strong> frictionfordifferent materials”, Tribology International, Vol.41, No. 4, pp. 307-14, 2008.[5] Chowdhury, M.A. and Helali, M.M.: “The frictionalbehavior <strong>of</strong> composite materials under horizontalvibration”, Industrial Lubrication and Tribology,Vol. 61, No. 5, pp. 246-53, 2009a.[6] Chowdhury, M.A. and Helali, M.M.: “The frictionalbehavior <strong>of</strong> materials under vertical vibration”,Industrial Lubrication and Tribology, Vol. 61, No.3, pp. 154-60, 2009b.[7] El-Tayeb, N.S.M. and Mostafa, I.M.: “The effect <strong>of</strong>laminate orientations on friction and wearmechanisms <strong>of</strong> glass reinforced polyestercomposite”, Wear, Vol. 195, pp. 186-91, 1996.[8] El-Tayeb, N.S.M. and Gadelrab, R.M.: “Frictionand wear properties <strong>of</strong> e-glass fiber reinforcedepoxy compositesunder different sliding contactconditions”, Wear, Vol. 192, pp. 112-17, 1996.[9] Bahadur, S. and Zheng, Y.: “Mechanical andtribological behavior <strong>of</strong> polyester reinforced withshort glass fibers”, Wear, Vol. 137, pp. 251-66, 1990.[10] Bahadur, S. and Polineni, V.K.: “Tribologicalstudies <strong>of</strong> glass fabric-reinforced polyamidecomposites filled with CuO and PTFE”, Wear, Vol.200, pp. 95-104, 1996.[11] Watanabe, M.: “The friction and wear properties <strong>of</strong>nylon”, Wear, Vol. 110, pp. 379-88, 1968.[12] Tanaka, K.: “Transfer <strong>of</strong> semi crystalline polymerssliding against smooth steel surface”, Wear, Vol.75, pp. 183-99, 1982.[13] Bahadur, S. and Tabor, D.: “Role <strong>of</strong> fillers in thefriction and wear behavior <strong>of</strong> high-densitypolyethylene”, in Lee, L.H. (Ed.), Polymer Wear andIts Control, ACS Symposium Series, Vol. 287, ACSPublications, Washington, DC, pp. 253-68, 1985.[14] Pihtili, H. and Tosun, N.: “Effect <strong>of</strong> load and speedon the wear behavior <strong>of</strong> woven glass fabrics andaramid fiber-reinforced composites”, Wear, Vol.252, pp. 979-84, 2002a.[15] Pihtili, H. and Tosun, N.: “Investigation <strong>of</strong> the wearbehavior <strong>of</strong> a glass fiber-reinforced composite andplain polyester resin”, Composites Science andTechnology, Vol. 62, pp. 367-70, 2002b.[16] Bijwe, J., Tewari, U.S., Vasudevan, P.: “Frictionand wear studies <strong>of</strong> polyetherimide composites”,Wear, Vol. 138, pp. 61-76, 1990.[17] Bijwe, J., Indumathi, J., John Rajesh, J. and Fahim,M.: “Friction and wear behavior <strong>of</strong> polyetherimidecomposites in various wear modes”, Wear, Vol. 249,pp. 715-26, 2001.[18] Bijwe, J. and Indumathi, J.: “Influence <strong>of</strong> fibers andsolid lubricants on low amplitude oscillating wear<strong>of</strong> polyetherimide composites”, Wear, Vol. 257, No.5/6, pp. 562-72, 2004.[19] Bijwe, J., Indumathi, J. and Ghosh, A.K.: “Role <strong>of</strong>fabric reinforcement on the low amplitudeoscillating wear <strong>of</strong> polyetherimide composites”,Wear, Vol. 256, No. 1/2, pp. 27-37, 2004.[20] Zhang, S.W.: ‘State-<strong>of</strong>-the-art <strong>of</strong> polymer tribology’,Tribol. Int., Vol. 31, Nos. 1–3, pp.49-60, 1998.[21] Kowandy, C., Richard, C. and Chen, Y.M.:‘Characterization <strong>of</strong> wear particles forcomprehension <strong>of</strong> wear mechanisms case <strong>of</strong> PTFEagainst cast iron’, Wear, Vol. 265, No. 11–12, pp.1714–1719, 2008.[22] Yamaguchi, Y.: Tribology <strong>of</strong> Plastic Materials:Their Characteristics and Applications to SlidingComponents, Elsevier, Amsterdam, 1990.[23] Hooke, C.J., Kukureka, S.N., Liao, P., Rao, M. andChen, Y.K.: “The friction and wear <strong>of</strong> polymersinnon-conformal contacts”, Wear, Vol. 200, pp. 83-94, 1996.[24] Lawrence, C.C. and Stolarski, T.A.: “Rollingcontact wear <strong>of</strong> polymers: a preliminary study”,Wear, Vol. 132, pp. 83-91, 1989.[25] Feyzullahoglu, E. and Saffak, Z.: ‘The tribologicalbehavior <strong>of</strong> different engineering plastics under dryfriction conditions’, Mater. Design, Vol. 29, No. 1,pp. 205–211, 2008.[26] Wang, Y.Q., Li, J.: ‘Sliding wear behavior andmechanism <strong>of</strong> ultra-high molecularweightpolyethylene’, Mater. Sci. Eng., Vol. 266, No. 1–2,pp. 155–160, 1999.[27] Mimaroglu, A., Unal, H. and Arda, T.: ‘Friction andwear performance <strong>of</strong> pure and glass fiber reinforcedpoly-ether-imide on polymer and steel counterfacematerials’, Wear, Vol. 262, No. 11–12, pp.1407–1413, 2007.[28] Unal, H., Sen, U. and Mimaroglu, A.: ‘Dry slidingwear characteristics <strong>of</strong> some industrial polymersagainst steel counterface’, Tribol. Int., Vol. 37, No.9, pp. 727–732, 2004.[29] Unal, H., Sen, U. and Mimaroglu, A.: ‘An approachto friction and wear properties<strong>of</strong>polytetrafluoroethylene composite’, Mater.Design, Vol. 27, No. 8, pp. 694–699, 2006.[30] Sirong, Y., Zhongzhen, Yu., Mai, Y-W.: ‘Effects <strong>of</strong>SEBS-g-MA on tribological behavior <strong>of</strong> nylon66/organoclay nanocomposites’, Tribol. Int., Vol.40, No. 5, pp. 855–862, 2007.[31] Bahadur, S. and Kapoor, A.: ‘The effect <strong>of</strong> ZnF2,ZnS and PbS fillers on the tribological behavior <strong>of</strong>nylon 11’, Wear, Vol. 155, No. 1, pp. 49–61, 1992.[32] Wang, J., Gu, M., Bai, S. and Ge, S.: ‘Investigation<strong>of</strong> the influence <strong>of</strong> MoS2 filler on the tribological13 th International Conference on Tribology – Serbiatrib’13 73
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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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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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[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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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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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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For Thrust Force of 40KNKrytox 215
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Krytox 215 (µ = 0.03204 Pa.s)Figur
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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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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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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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each of which is measured by the le
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Fractal dimensions were determined
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Figure 3. Modified force acting sch
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nanocomposites. The influence of fi
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4. RESULTS AND DISCUSSION4.1 Morpho
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Figure 6. Loading and unloadin vers
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3 8 12 1 4 2 4
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The material after qualifying the r
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It has already been mentioned that
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Degradation & Stability, Vol. 69, N
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conformance to researchers’ requi
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This part is assembled of pneumatic
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matrixes describe the state of the
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values influence of themeasurement
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Figure 1. Friction stir weldinga -
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(t 2 t
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M fr / T [-] [-]10.90.80.70.60.50.4
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M fr / T [-]10.90.80.70.60.50.40.30
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experimentally determined that for
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4. DISCUSSIONAccording to the theor
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2.1 The life cycle of the reportThe
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uticaja na osnovu kompozita, a time
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5. ZAKLJUČCIStruktura tiksolivene
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dobijene različite karakteristike
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vizuelno, na dnevnoj svetlosti, pod
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LITERATURA[1] Зинченко В.
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Slika 1. Rotorni bager - glodar VII
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stvaraju sliku stanja i svoja zapa
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njihovih kotrljanih elemenata. Mere
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postupka i uticaja parametara depoz
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posledica različite raspodele mikr
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ZrO 2 Y 2 O 3 je takođe zbog oksid
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3.2 Pneumatska osetljivostOblast pr
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p mg (δ), koji je zbog malih struj
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PNEUMATIC PROBE HEAD SELECTION FOR
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1. Podsistem kopanja2. Podsistem pr
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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