iosr-JMCE   Volume-11 ~ Issue-4 ~ July-Aug 2014

Abstract: In the présent investigation an attempt has been made to investigate and study the mechanical properties of of Al - 4.5wt. % Cu Alloy reinforced with Fly ash and Silicon Carbide metal matrix composites produced by stir cast technique. In this study Al - 4.5wt. % Cu Alloy was considered as the base matrix to which Fly ash and SiC particulates were used as reinforcements. 3 wt. % of SiC and 3 wt. % of Fly Ash was added to the base matrix. In the preparation of the hybrid composite the reinforcements namely Fly Ash and SiC were preheated to a temperature of 400 degree Celsius and dispersed in two steps into the vortex of molten Al-4.5 wt. % Cu alloy. To improve the wettability 0.6 wt. % of Mg was added into the molten metal. The Microstructural study was carried out using optical microscopy which resulted in uniform distribution of reinforced particles in matrix alloy.,

[1]. Balasubramanian,R, Maheshwaran, Effect of inclusion of SiC particulates on the mechanical resistance behavior of stir cast AA6063/ SiC composites, Materials and Design 65, 2015, 511-520.
[2]. Vijay kumar S Maga, S Motagi, A study on Mechnical Properties of Aluminium alloy (Lm6) reinforced with Fly ash, Red mud and Silicon carbide, Journal of Mechanical and Civil Engineering Volume 11, Oct 2014, 7 – 16.
[3]. Rajendra kumar kushwaha,Sihail ahmad siddiqui, Characterization Al-4.5% Cu Alloy and Study of Wear Resistance, International Journal of Scientific Engineering and Technology, Volume No 3, Issue No 3, 263-266.
[4]. Qiurong Yang, Jinxu Liu, Shukui Li, Fuchi Wang, and Tengteng Wu, Fabrication and Mechanical properties of Cu- coated woven carbon fibers reinforced aluminium alloy composite, Materials and Design, 57,2014,442-448.
[5]. Viney Kumar, Rahul Dev. Gupta, and N K Batra, Comparison of Mechanical Properties and effect of sliding velocity on wear properties of Al 6061, Mg 4%, Fly ash and Al 6061, Mg 4%, Graphite 4%, Fly ash Hybrid Metal matrix composite.
[6]. T. Rajmohan, K. Palanikumar, and S. Ranganathan, Evaluation of mechanical and wear properties of hybrid aluminium matrix composites, Trans. Nonferrous Met. Soc. China, 23, 2013, 2509 – 2517.

Abstract: The conversion of hydraulic energy into mechanical energy takes place in hydraulic turbines. Further this energy is converted to electrical energy with the help of generators and then supplied to consumer. With increasing demand, efficiency of every machine plays vital role. When water is stored at very high head, hydraulic energy can be converted efficiently into mechanical energy with the help of Pelton turbine. The performance of Pelton turbine at designed and off-design points is important. Performance of turbo-machines is generally evaluated before installation with the help of model testing at designed and off design regimes.

[1]. V.V. Barlit, P. Krishnamachar, M.M. Deshmukh, Adarsh Swaroop and V.K. Gehlot, Hydraulic turbines- volume I and II (MACT, Bhopal, 1983.)
[2]. P.N. Modi and S.M. Seth, Hydraulics and fluid mechanics including hydraulic machines (Standard Book House, Delhi, 2011) [3]. J. Lal, Hydraulic machines including fluidics (Metropolitan Book Company. New Delhi, 2007)
[4]. J.D. Desai, V.A Soni, V.K Chauhan, S.S Charania and K.C Patel, Evaluation of twin jet Pelton turbine using CFD, Proceedings of Thirty Ninth National Conference on Fluid Mechanics and Fluid Power, Gujarat, India, 2012, 194-197.
[5]. V Gupta, V Prasad and R Khare, Numerical modeling for hydro energy convertor: Impulse turbine, Proceedings of International Conference on Global Scenario in Energy & Environment, Bhopal, India 2013.

Abstract: In this paper, the impact of changing the location of the tool point, on the moving platform, on the dynamics of a planar parallel manipulator is investigated. Lagrange-d'Alembert formulation is used to develop the dynamic model of the present manipulator. To evaluate the dynamic performance of the parallel manipulator, the input efforts and energy consumptions are calculated for the manipulator when the end-effector is positioned at different locations on the moving platform and executing given desired trajectories. The manipulator's dimensions and parameters are kept the same during the optimization process and only the position of the tool-point on the moving platform is changed. The dynamic performance of the manipulator is then evaluated and optimized.

[1] C. Gosselin, L. Perrault, and C. Viallancourt, Simulation and computer-aided kinematic design of three-degree-of-freedom spherical parallel manipulator, Journal of Robotic Systems, 12, 1995, 857 – 869.
[2] J. P. Merlet, Jacobian, manipulability, condition number, and accuracy of parallel robots, ASME J. Mech. Des. 128, 2005, 199-206.
[3] Y. Li and M.B. Gary, Are Parallel Manipulators More Energy Efficient? Proceedings of 2001 IEEE International Symposium on computational Intelligence in Robotics and Automation, Banff, Alberta, Canada, 2001, 41-46.
[4] M. Pellicciari, G. Berselli, F. Leali, and A. Vergnano, "A method for reducing the energy consumption of pick and place industrial robots," Mechatronics, 23(3), 2013, 326-334.
[5] R.F. Abo-Shanab, Effect of changing the position of tool point on the moving platform on the kinematics of a 3RRR Planar Parallel Manipulator, Applied Mechanics and Materials Vols. 541-542, 2014, 792-797.
[6] W.Q.D. Do and D.C.H. Yang, Inverse Dynamic analysis and simulation of a platform type of a robot, Journal of Robotic Systems, 5(3), 1988, 209-227.

Abstract: Conventional building material like cement is both resource and energy-intensive material. Production of cement also emits CO2 in atmosphere. In order to decrease this environmental pollution and cost of conventional building materials, alternative materials like fly ash, ground granulated blast-furnace slag, metakaolin, rice husk ash (RHA) and silica fume is used because of their pozzolanic behavior. RHA which contains high silica content produced by controlled incineration of rice husk can be used as supplementary cementitious material (SCM) in concrete production since it exhibits high pozzolanic characteristics and contributes to strength and impermeability of concrete. This paper presents an overview of the work carried out on the use of RHA as partial replacement of cement in concrete and its effect on workability, compressive strength and chloride permeability of concrete.

[1] Ha Thanh Le, Sang Thanh Nguyen, and Horst-Michael Ludwig (2014) "A Study on High Performance Fine-Grained Concrete Containing Rice Husk Ash" International Journal of Concrete Structures and Materials, Vol.8, No.4, pp.301–307.
[2] J. H. S. Rego, A. A. Nepomuceno, E. P. Figueiredo, N. P. Hasparykand and L. D. Borges (2014) "Effect of Particle Size of Residual Rice-Husk Ash in Consumption of Ca(OH)2" ASCE Journal of Materials in Civil Engineering.
[3] Viet-Thien-An Van, Christiane Robler, Danh-Dai Bui and Horst-Michael Ludwig (2014) "Rice Husk Ash As Both Pozzolanic Admixture And Internal Curing Agent In Ultra- High Performance Concrete" Journal of Cement & Concrete Composites 53, Pg no. 270-278.
[4] A. Muthadhi and S. Kothandaraman (2013) "Experimental Investigations of Performance Characteristics of Rice Husk Ash–Blended Concrete" ASCE Journal of Materials in Civil Engineering, Vol. 25, No. 8.