IJIFR VOLUME 3 ISSUE 12 AUGUST 2016

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ISSN: 2347-1697 International Journal of Informative & Futuristic Research (IJIFR) Volume - 3, Issue -12, August 2016 Continuous 36 th Edition, Page No: 4537-4550 V. Impact strength: From the graph figure 11, it is clear that the composite containing no filler i.e. the bare composite shows highest impact strength 41 J/m. The addition of fillers ZrO 2 and WS 2 show a decreasing trend in the impact strength. However, composite with 5.0 wt. % ZrO 2 and 2.5 wt. % WS 2 improved the impact strength of epoxy significantly, achieving a 38% improvement compared to C3 composite. Additional inclusion of fillers resulted in strength reduction of composites. Flexural Strength 45 40 35 30 25 20 15 10 5 0 41 21.43 29.95 25.02 23.01 22.01 17.95 C 0 C1 C2 C3 C4 C5 C6 Composition Figure 11: Results of Izod impact Test The experimental results above revealed that addition of ZrO 2 and WS 2 fillers in epoxy show a noticeable effect on mechanical properties of the composites. In addition, at approximately C6 all the properties begin to display insensitivity to further increase in filler content seeming to suggest that higher concentrations above C5 may in fact cause degradation in the properties. 3.2 Tribological Properties Since four parameters and four levels are identified (table 3) according to array selector “L16”, orthogonal array is selected. The wear of polymer composites with varying filler content, test duration, normal load and sliding velocity are reported in table 4. The S/N ratios obtained for wear rate are presented in table 5. The analysis shows that most influencing parameter on wear rate is time followed by velocity, filler content and normal load. Based on tabulated results it is observed that for the given time, wear rate of the composites decreases with increasing filler content that means at a given time of contact the wear rate is sensitive to filler content and velocity. Table 3: Process variables and their levels Parameters Levels 1 2 3 4 A:Sliding velocity (m/sec) 2.512 5.024 7.536 10.048 B:Normal Load (N) 39.24 49.05 58.86 68.87 C: Filler content (%) 1 2 3 4 D:Time (min) 5 10 15 20 C 0 C1 C2 C3 C4 C5 C6 Karle Anuja H., Giri Pooja P, J. S. Sidhu:: Investigation Of Mechanical And Tribological Behaviour of WS2 & ZrO2 Filled Epoxy Composites 4545
Expt. No ISSN: 2347-1697 International Journal of Informative & Futuristic Research (IJIFR) Volume - 3, Issue -12, August 2016 Continuous 36 th Edition, Page No: 4537-4550 Table 4: Experimental Results with Specific Wear rate and S/N ratios Sliding velocity m/sec Normal Load N Filler content Wt.% Time min Specific wear rate mm 3 /Nm S/N ratio 1 2.512 39.24 1 5 0.000853 61.38 2 5.024 39.24 2 10 0.000196 74.15 3 7.536 39.24 3 15 0.0000469 86.57 4 10.048 39.24 4 20 0.0000857 81.34 5 7.536 49.05 2 5 0.000418 67.57 6 10.048 49.05 1 10 0.000142 76.95 7 2.512 49.05 4 15 0.0000731 82.72 8 5.024 49.05 3 20 0.0000422 87.49 9 10.048 58.86 3 5 0.000140 77.07 10 7.536 58.86 4 10 0.0000609 84.30 11 5.024 58.86 1 15 0.0000947 80.47 12 2.512 58.86 2 20 0.000130 77.72 13 5.024 68.87 4 5 0.000156 76.13 14 2.512 68.87 3 10 0.000240 72.39 15 10.048 68.87 2 15 0.0000372 88.58 16 7.536 68.87 1 20 0.0000675 83.41 Table 5: S/N ratios for wear rate Level Sliding Velocity A Normal Load B % Filler Content C Time D 1 73.55 75.86 75.55 70.53 2 79.56 78.68 77.00 76.94 3 80.46 79.89 80.88 84.58 4 80.98 80.12 81.12 82.49 Delta 7.43 4.26 5.57 14.05 Rank 2 4 3 1 The delta is the difference between maximum and minimum values of S/N ratio of particular parameter. Highest value is ranked 1 and has the maximum influence on the process. The result shows that factor combination A4 B4 C4 D3 gives minimum wear rate. Increasing time of contact between pin and disc, the wear rate increases. The minimum time of contact also reported maximum wear with minimum filler content. At a given time of contact the wear rate is sensitive to velocity and filler content. Load bearing ability of the composite is indicated by the decrease in wear rate. These fillers were able to share the portion of normal load applied and hence reduce wear for given time. At sliding interface, frictional heat increases due to increase in sliding velocity for given load and time and this contributes to increase in wear rate. Depending on filler percentage, test duration, applied load and sliding velocity the wear rates of composites are changing. Karle Anuja H., Giri Pooja P, J. S. Sidhu:: Investigation Of Mechanical And Tribological Behaviour of WS2 & ZrO2 Filled Epoxy Composites 4546
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IJIFR VOLUME 3 ISSUE 12 AUGUST 2016

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