Advanced Materials Research Vols. 984-985

Abstract: Powder forming process is used for fabrication of bulk ceramic components. Optimization of powder forming process parameters in the fabrication of alumina-zirconia composite used in orthopedic implants is done for desired physical property. In this research work, process parameters such as composition of zirconia, compaction pressure and sintering temperature were analyzed using Response Surface Method (RSM). The physical properties such as density, porosity and water absorption characteristics of the proposed composite were studied. To study the influence of the different process parameters over the physical properties of the fabricated composites materials, experimental runs were framed by using Box behnken method. Three factors and two levels were selected with a total of 17 runs and their consecutive tests were carried out. The validity of the model was checked and the significant parameters were identified using Analysis of variance (ANOVA). The results indicate that the sintering temperature is influencing predominantly the physical properties of composites compared to other process parameters.

Abstract: Effective length factor of CFS lipped channel beams subjected to flexure are given in AS/NSZ 4600, Euro code Part 1.3 and BS 5950, Part V taking into account their buckling phenomena. The coefficients are given for boundary conditions considering the effect of torsion and warping restraint. The effect of torsion and warping restraints is treated by defining the range of values for the coefficients. Lateral torsion buckling of the CFS beams greatly influences the effective length factors. 16 CFS lipped channel beams have been taken for the study with depth of 100mm, flange width 50mm and lip size varies from 10mm to 20mm.Experimental investigation has been carried out to verify the coefficients for the defined boundary conditions. The influence of flange width and lip size on the buckling length has been investigated. The results are compared with the Indian code provisions for hot rolled beams.

Abstract: Hard turning is one of the important operations for hardened steels and it has more benefits than grinding such as cycle time, process flexibility, and better surface finish at significantly better material removal rate and lesser environment issues. Although the machining process is performed with low feed rate and depths of cut, it results lesser machining time as compared with conventional turning. This paper discusses the machining performance tests on the AISI D2 hardened steel to 64 HRC were carried out using chemical vapor deposition ( cvd) coated carbide insert. Experiments are carried out on lathe using the cutting conditions prefixed. The responses studied in the investigation are cutting forces (f_x, f_y, and f_z) and. The cutting parameters considered for the investigation are feed rate, depth of cut and cutting speed. The performance of machining parameters on response is studied and presented in detail. In chip morphology study results different formation and types of chips operating under various cutting conditions.

Abstract: This paper deals with the advanced oxidation using Electro-fenton reagent for the degradation of azo-dyes in textile effluents. Discharge of textile effluents causes inevitable pollution of water resources which calls for further treatment methods. In this experiment, textile effluent samples were treated with iron electrodes with the reagents, hydrogen peroxide and ferrous sulfate .The acid dye effluents which were used in this study are Acid Orange 7, Acid Red 88, and Acid Violet 7. The temperature was set to 40° C. Samples of 20 ml were analyzed for Biological Oxygen Demand (BOD), Chemical Oxygen Demand (COD) and Colour reduction. Experiments were carried out at voltage variations of 2, 4, 6 and 8 volts. From the results, COD and Colour were observed to be reduced drastically from respective original values before treatment with Fenton’s reagent using electro-chemical method.Key words--- Advanced oxidation, Electro-fenton, BOD, COD, Colour reduction

Abstract: Ab s t r act Hybrid Rubberized Composite Slabs (HRCS) is an innovative material which has been developed for highway barriers in bridge construction to avoid vehicle accidents and thereby reducing the risk to public. A three dimensional hybrid rubberized composite slab model (HRCS) was created using Finite element Analysis Software ANSYS and was validated by previous experimental research works on concrete with crumb rubber. Finite element simulations were performed to examine the effect of replacing 0-20% of fine aggregates with crumb rubber. The load-displacement behavior was analyzed for the plain and hybrid rubberized composite slabs under static bending loads. From the results, it was found that, the displacement decrease significantly with increase in the amount of fine crumb rubber replacement. The static bending load decreases as the percentage of replacement of fine crumb rubber increases. Aggregate replacement with crumb rubber in concrete decreases its strength under static bending load. As confirmed by experimental results, FEA can effectively simulate the behaviour of HRCS when the proper numerical model is adopted. Keywords: Hybrid Rubberized Concrete Slab, Crumb Rubber, Finite element analysis (FEA), Static Bending Load.

Abstract: This work addresses the effect of intermediate lamina orientation and chemical treatment of natural fiber reinforced hybrid composites on tensile and free vibration properties. Two different form of fibers such as Sansevieria cylindrica (SCF) in the form of loosely separated and coconut sheath (CS) in the form of naturally available woven mat have been chosen for hybrid reinforcement in polyester matrix resin. The compression molding technique was used to fabricate the composites with the help of specially designed mold for fiber orientation. By keeping the overall weight percentage of hybrid composites constant (40 wt %), the long fiber SCF was sandwiched between two CS. The hybrid composites were fabricated the with five different intermediate lamina orientation (i.e, 0°, 30°, 45°, 60° and 90°) using SCF. The tensile strength and free vibration properties were analyzed for all the fabricated composites according to the ASTM standard and impulse hammer technique.The change in orientation of intermediate lamina have shown significant effect on both tensile and vibration properties. The potassium permanganate (KMnO₄) chemical treatment was also carried out for the optimum oriented angle laminate. The chemical treatment shows the siginificant enhancement in both the properties compared to the untreated condition.

Abstract: In the present work coconut sheath fiber has been used to prepare the composite material with epoxy resin. First the untreated coconut fiber was used to prepare the composite material then the coconut sheath fibers were treated with NAOH to modify the fiber properties. Then the effect of fiber loading and alkali treatment were evaluated and investigated. The mechanical properties of alkali treated fibers found to be higher than the untreated coconut sheath fiber reinforced composite materials. The water absorption properties of alkali treated fibers were found to be higher than the untreated coconut sheath fiber reinforced composite materials.

Abstract: Drilling of fiber reinforced composite materials presents a plethora of questions to the engineers and scientists. A number of research endeavors have been made in the recent years to fully characterize the drilling process of fiber reinforced composite materials. The efforts have been made in the direction of optimization of the operating variables and conditions for minimizing the drilling induced damages. This paper presented the delamination analysis of drilled holes in coir fiber-reinforced polyester composites. The results indicated that the delamination factor in coir fiber-reinforced composites is lower comparing with glass fiber reinforced composites.

Abstract: The modern development in the field of science and technology has created a demand for many advanced engineering materials. In recent days, aluminium related metal matrix composite is a probable material for many applications such as transport, aerospace, marine and automobile applications. In this paper, experiments were conducted on composite having various weight fractions of SiC and Al₂O₃ particulates fabricated by stir casting method. Characterization studies were conducted on the Al 7075 alloy and composite samples to assess the hardness and microstructural properties. Final samples were tested for hardness using vickers hardness machine. Microstructure examination was conducted by optical microscope. Microstructure of the composite samples reveals the presence and homogeneous distribution of reinforcements in the Al 7075 matrix. The hardness of aluminium metal matrix composites was increased due to the addition of silicon carbide and alumina reinforcements.

Abstract: Metal matrix composites, produced by stir casting method, have more advantages when compared to other methods. Aluminium alloy Al6061 was reinforced with various percentages of TiB₂ particles by using high energy stir casting method. The characterization was performed through EDS and SEM. The mechanical behaviours like hardness, tensile and wear were investigated. Wear experiments were conducted by using a pin-on-disc wear tester at varying load to evaluate the tribological property of Al6061-TiB₂ composite. The wear mechanism was studied through SEM. In this study revealed that the addition of TiB₂ improves the wear resistance of aluminium composites. The results showed that the mechanical properties, such as tensile strength, wear resistance and hardness increased by the percentage of TiB₂ present in the samples when compared with base aluminium alloy.