http://nopr.niscpr.res.in/handle/123456789/42911 Sat, 10 Oct 2026 13:19:23 GMT 2026-10-10T13:19:23Z http://nopr.niscpr.res.in/handle/123456789/42937 Title: Experimental investigation of flank wear and surface roughness during hard turning of AISI H11 steel with CBN tools Authors: Rathod, K B; Lalwani, D I Abstract: Hard turning of AISI H11 steel using TiN coated cubic boron nitride (CBN) tools is carried out to investigate the effect of cutting conditions on flank wear and surface roughness. The face centered central composite design is used to develop the nonlinear model of flank wear and surface roughness as a function of cutting speed, feed rate and work-piece hardness. The sequential approach is used to conduct the experiments. First, a full factorial (2³) experiments with three centre points are conducted. If factorial design detects the curvature then additional experiments are required in second part. The results show that linear model was best suited for flank wear, whereas for surface roughness model, the six axial points are added to build a non-linear model. A linear model best fits the variation of flank wear with cutting speed as the most affecting parameter contributes 79.52%, plus work-piece hardness and feed rate contribute 14.75% and 2.65% respectively, whereas interaction effect between cutting speed and work-piece hardness provides secondary contribution of 1.53%. A non-linear quadratic model of surface roughness best suited with major contribution of feed rate, second work-piece hardness and interaction effect of cutting speed and feed rate with quadratic effects of all parameters. Page(s): 171-181 Thu, 01 Jun 2017 00:00:00 GMT http://nopr.niscpr.res.in/handle/123456789/42937 2017-06-01T00:00:00Z http://nopr.niscpr.res.in/handle/123456789/42936 Title: Prediction of the surface roughness and wheel wear of modern ceramic material (Al₂O₃) during grinding using multiple regression analysis model Authors: Kanakarajan, P; Sundaram, S.; Kumaravel, A; Rajasekar, R; Venkatachalam, R Abstract: Grinding process is used widely for producing industrial parts with high precision and high surface quality for modern ceramics. But only a few machining tests were carried out on grinding by using silicon carbide (SiC) grinding wheel with various parameters. In this paper, an analytical model is developed to determine the surface roughness (<em>R</em>_a) and wheel wear (<em>W</em>_w) of modern ceramic material (Al₂O₃) during grinding. The model is developed to fitting the relationships <em>R</em>_a, <em>W</em>_w versus three process parameters (depth of cut, feed and grain size) using multiple regression analysis method. The main objective of this paper is to develop a model for optimizing the <em>R</em>_a and <em>W</em>_w values of modern Al₂O₃ ceramic material and SiC grinding wheels during grinding. Besides, experimental results are used to establish the multiple regression analysis equations for <em>R</em>_a and Ww. The predicted values of <em>R</em>_a and <em>W</em>_w show linear relationships versus three parameters and have a good agreement with experiment results. Page(s): 182-186 Thu, 01 Jun 2017 00:00:00 GMT http://nopr.niscpr.res.in/handle/123456789/42936 2017-06-01T00:00:00Z http://nopr.niscpr.res.in/handle/123456789/42935 Title: Effect of fiber orientation and ply stacking sequence on buckling behaviour of basalt-carbon hybrid composite laminates Authors: Dhuban, S B; Karuppanan, S; Mengal, A N; Patil, S S Abstract: The aim of this study is to investigate the effect of fiber orientation and ply stacking sequence of basalt-carbon hybrid composite laminates on the critical buckling strength, experimentally and by using nonlinear finite element analysis. The composite laminated plates are simply supported and subjected to axial compression load. Nonlinear FEA results using ANSYS have good agreement with the experimental results. FEA results showed that the outer layers have the most significant influence on the buckling strength of the composite laminated material. Furthermore, placing carbon fiber reinforced layers in the outer surface of the basalt-carbon/epoxy hybrid laminates results in significant increase in the critical buckling load compared to placing basalt fiber reinforced layers in the outer surface. It is also concluded that [0₂C/0B/<img src='/image/spc_char/plus_min.gif' border=0>45B]_S laminate is the best combination of the hybrid stacking sequences as far as buckling strength is concerned. Page(s): 187-193 Thu, 01 Jun 2017 00:00:00 GMT http://nopr.niscpr.res.in/handle/123456789/42935 2017-06-01T00:00:00Z http://nopr.niscpr.res.in/handle/123456789/42934 Title: Development and performance analysis of fluoroelastomer-graphite nanoplatelet nanocomposites Authors: Moni, Grace; Anoop, P; Thomas, Jerin; George, Soney C Abstract: Fluoroelastomer/graphite nanoplatelet (FKM/GNP) nanocomposites were prepared by two-roll mixing. The effect of graphite nanoplatelets on the mechanical and thermal properties of fluoroelastomer nanocomposites was studied as a function of filler loading. The dispersion and interaction of the filler in the polymer matrix was analyzed by scanning electron microscopy (SEM) and X-ray diffraction (XRD) analysis. It was found that the nanocomposite with 8 phr of filler loading showed optimum properties with 400% enhancement in tensile properties and 140% increase in tear strength. The thermal stability is also enhanced for 8 phr filler loaded fluoelastomer nanocomposite and only 32% weight loss was observed at 475°C. Incorporation of GNP efficiently improved both the thermal and mechanical properties of the nanocomposites by its interaction with the polymer matrix. Page(s): 194-200 Thu, 01 Jun 2017 00:00:00 GMT http://nopr.niscpr.res.in/handle/123456789/42934 2017-06-01T00:00:00Z