Nano rice husk ash particles were prepared from completely combusted rice husk by ball milling. These particles were successfully reinforced in Al6061 metal matrix through ultrasonicator-assisted stir casting process in different proportions such as 1, 2, 3, 4, and 5 in weight percentage. In order to produce the composites, different parameters were selected such as melting temperature, stirring time, and stirring speed. The influence of the percentage weight of the reinforcement and the different casting process parameters on the tensile strength of the developed composite had been analyzed in detail. The aluminum alloy was melted at selected temperatures about 700 °C, 750 °C, and 800 °C, and stirring was carried out at different selected speeds 400 rpm, 500 rpm, and 600 rpm for 60 s, 90 s, and 120 s. Finally, the improvement in tensile strength is observed with the increase in the percentage of the NRHA composition up to 2 weight percent and then deteriorated. But these tensile strength values are much better than bare material. The optimum process parameters were found to be 800 °C melting temperature at 600 rpm of stirring speed for 120 s.

Metal matrix composites are getting much attraction in the automobile, aeronautical, and aerospace applications. Researchers are focusing on organic reinforcement materials such as red mud and fly ash. Rice husk ash is an industrial waste and has least applications. Surprisingly, it possess very rich silica content. The hardest metallic structures can be developed by reinforcing it with metals. In this research work, it is intended to develop nanometal matrix composites using rice husk ash. For this, rice husk ash was ground into nano-size particles and successfully reinforced in Al6061 using ultrasonic-assisted stir casting. The weight percentage of nano-rice husk ash is varied such as 1, 2, 3, 4, and 5 wt.% which are reinforced successfully. The process parameters of casting, such as casting temperature of 700, 750, and 800 $$^\circ{\rm C} $$ , stirring speed 400, 500, and 600 rpm, and stirring time 60, 90, and 120 s, were optimized using the Taguchi method. Finally, 2 wt.% of reinforcement, at 800 $$^\circ{\rm C} $$ of melting temperature, 600 rpm stirring speed, and for 90 s of stirring were found optimum. The result is validated with a confirmation test. The effect of each parameter on the hardness of developed composite material is analyzed using analysis of variance and found that 2 wt.% of nano-rice husk ash yielded better hardness, and there is not much difference between, stirring speeds of 500–600 rpm, and also not much difference for stirring times of 90–120 s.

Rice husk ash is produced after combustion of rice husk, which is an industrial waste. Rice husk ash consists of 92% of SiO2. This paper describes the synthesis of completely combusted white coloured Nano Rice Husk Ash to nanoparticle size using planetary ball mill, characterization of Rice Husk Ash and Nano Rice Husk Ash using energy dispersive X-ray Analysis, X-ray Diffraction, Dynamic Light Scattering, Scanning Electron Microscopy, Thermogravimetric Analysis and Differential Thermal Analysis. For synthesizing nanoparticles, the macro size white coloured Rice Husk Ash is taken in a planetary ball mill and milled until getting nano-size particles. The characterization results revealed that after 80 hours of ball milling the Rice Husk Ash particle size is reduced to nano range, which is an amorphous structure and is thermally stable. The nano Rice Husk Ash is successfully reinforced in molten aluminium 6061 using an electrical furnace equipped with stirrer and sonicator. Improvement in hardness of new aluminium 6061 nanocompo sites is observed with the reinforcement of nano rice husk ash. It is concluded that the optimum percentage of nano Rice Husk Ash reinforcement in aluminium 6061 matrix is 2 percent in weight to obtain better hardness.

Due to their high strength-to-weight ratio, carbon nanotube (CNT) reinforced polymer composites are being considered as one of the most promising nanocomposites which can improve the performance when used in structural applications. The deflection and buckling behavior are the most important parameters needs to be considered in the design of structural members like beams, plates and shells. In the present paper the elastic constants of CNT reinforced polymer composites has been evaluated by using Mori-Tanaka micromechanics approach. Knowing the elastic properties of CNT reinforced polymer composites, an analytical study is being conducted to investigate the deflection and buckling behaviour of nanocomposites beams for different CNT volume fractions at different boundary conditions using first order shear deformation theory. The effect of stacking sequence and CNT radius on the deflection and buckling of beam is also been presented. This study is being conducted primarily with an intension to examine the stiffening effect of CNTs when used in polymer composites as reinforcement.

This paper presents synthesis of Nano Rice Husk Ash and Raman spectra for rice husk ash and rice husk ash milled in Planetary Ball Mill. Rice husk is collected from a rice mill at Kakinada and is thoroughly washed, dried and then burnt in electric furnace at 6500C for one and half hour so as to get white ash. This ash is in macro size and is milled in planetary ball mill for 36hours. Samples were taken for every one hour. The raw rice husk and nano rice husk ash samples were characterized by taking Raman spectra.

This paper presents the results of experimental studies of the noise of marine application pump axial flow fan. Axial flow fan is verified by both geometrical and experimental approaches. This section includes grid system used in geometric simulation, and boundary conditions. In order to know the complicate and complex physical features of an axial flow fan, a commercial computational fluid dynamics code, FLUENT, is utilized to perform the flow field analysis, which solves the Navier-Stokes equation using an amorphous finite volume-method. As a commercial computational fluid dynamics code, FLUENT has been extensively used in many turbo machinery applications. In this paper the noise predicted according to geometrical results will be compare with investigational results.