Advances in Science and Technology Vol. 120

Abstract: In the present study, A functionally graded cylinder subjected to internal pressure has been analyzed using the finite element method based software ANSYS. The variations of properties of the functionally graded material are considered based on a power-law function. The inner and outer surfaces of the cylinder are made of alumina and C45 steel respectively. The continuous composition of the two materials has been considered in the form of varying elastic modulus and Poisson’s ratio along the radial direction as the power-law function. The result of present approach is compared with analytical result of available literature. The comparison represents good coincidence between analytical and numerical results and confirms the accuracy of solutions presented in the present approach for cylinder made up of FGM. Further the stress distribution of FGM made cylindrical shell for given pressure load conditions have analyzed. Stress distributions along the radial direction are studied. The obtained result shows that the property of FGMs has a significant influence to the deformation and stress distribution along the radial direction. Numerical results presented are useful for engineer to design a cylinder made of FGMs

Abstract: Selective Laser Melting (SLM) is an Additive Manufacturing (AM) technique that uses a laser to selectively melt metallic powder in a layer-wise manner, in order to produce functional metal components. It offers great freedom in design and facilitates fast iterations, with the potential of speeding up development phases throughout a wide range of industries. Despite these opportunities, its application into industry is limited. One of the problems that are a limiting factor is dimensional accuracy, production time and surface roughness that are introduced to the components during manufacturing. In this work it is focused on to study the influence of process parameters and laser scanning strategy on the build time, part accuracy and surface roughness of as-fabricated Ti-6Al-4V alloy samples through SLM. The specimens are designed and fabricated at various levels of Layer thickness, Laser power and Scanning strategy and its effect on build time,part accuracy and surface roughness are studied

Abstract: Now a days, Non-Conventional Machining process is gaining more attention by the researchers. Abrasive Water jet machining (AWJM) is one of such machining process where material is removed with abrasive slurry as cutting tool. The present work discuss about the development of an optimal solution for minimizing surface roughness using a response surface methodology (RSM) while machining of EN grade steel. The machining parameters considered for the study are Abrasive Grain Size (AGS) and Hydraulic Pressure (HP) and Stand Off Distance (SOD) and the Abrasive Flow Rate (AFR). The response parameter is surface roughness (Ra). The experiments are performed based on the Box-Behnken design. Additionally, the significance of the developed optimization design has been identified using analysis of variance (ANOVA). Finally, the validity and adequacy of the developed model are done through confirmation tests. Key Words: Abrasive Water jet Machining, Response Surface Methodology, Optimization, ANOVA

Abstract: Rapid prototyping and additive manufacturing are the emerging trends in due to fast updating technology in all processing areas. An attempt is made in this paper to find the optimum parameters like layer thickness, infill pattern, ironing settings in Cura software interface. Two different filament material Polylactic Acid (PLA) and Acrylonitrile Butadiene Styrene (ABS) materials are selected to make the products. The objective is to get fine surface finished products at the outer surface of the components. Keeping the machine parameters constant, the fabrication parameters of components are varied by Cura software interface. The surface finish of the components made is measured with surf-tester. It is observed that the smooth surface finish of 2.159 μm is obtained for ABS as filament material, line fill pattern, smaller internal layer thickness and larger top and bottom layer thickness.

Abstract: The current research paper was focused on investigating the influence of wire electrical discharge machining parameters on machining responses of AA-6082/MoS₂/Al₂O₃ Hybrid Metal Matrix Composites (HMMCs). In this paper, Taguchi L₁₈ (2^1 ×3^4) orthogonal array was adopted to conduct the experiments. From the experimental investigations, it was observed that the electrode wire type, pulse on time, and pulse off time have shown a remarkable effect on the machining responses. Keywords: Al-MMC, AA-6082, Stir casting, MRR, Taguchi method

Abstract: The rail irregularities and wheel-rail interactions in a train running at high speeds may result in large-amplitude vibration in the train's car body and affect passengers by reducing ride comfort. The train suspension systems have a vital role in reducing the vibration and improving ride comfort to an acceptable level. The existing passive viscous dampers have limited scope of achieving this objective. In this paper Magnetorheological (MR) dampers as semi-active control devices for secondary suspension in a railway wagon are used for achieving better ride performance parameters. Compared the ride comfort parameters of the wagon with MR dampers against the conventional passive viscous dampers. The sprung mass acceleration, displacement and suspension travel are assessed for three different control strategies, skyhook, ground hook and hybrid. Matlab/Simulink software is used for simulation of the wagon suspension system.