IJEECM Journal of Mechanical Engineering (IJEECM-ME)

Hydrogen Embrittlement of heat treatable steel plates welding

Authors: Dasam Hari Satya Sai Srinivas, V Ravi Kumar, V Vijay Kumar

Abstract: In the paper, influence of hydrogen on mechanical properties of welded joints from heat-treatable structural steel plates were investigated. The heat treatment of welded plate specimens was performed, and then the specimens were charged with hydrogen electrolytically generated from 1 N H2SO4 solution. The following studies were carried out: static tensile test, hardness investigations, macroscopic metallographic investigations as well as investigations with the use of a scanning microscope. Hydrogen embrittlement of welded joints from steel plates was revealed by a distinct decrease of ductility and a slight decrease of strength. On the basis of metallographic investigations, it was found that in a fracture region there are fine pores created by the presence of hydrogen and its displacement due to formed stresses and plastic deformation. It was shown that welded joints are susceptible to hydrogen cracking in the heat affected zone and in the fusion zone.

Keywords: Hydrogen Embrittlement, steel, welding.

Design and Optimization of Laminated Hybrid Composite Cylinder with Stiffeners Subjected to Buckling Load

Authors: S Giriprasad, Dr S Srinivasa Rao, Dr M K. Naidu

Abstract: Fibre Reinforced Polymer composite (FRPC) materials have wide applications in aircraft and automobile structures due to their high specific stiffness and strength properties. FRPC materials traditionally designed and manufactured as multiply laminates consists of several unidirectional layers resulting in a material with spatially uniform stiffness/strength properties. The fibre orientation angle in most of the applications typically held fixed and mostly limited to unidirectional. By limiting each layer to have a constant orientation angle over the entire structural component cannot fully make use of the directional material properties offered by composite layers. The laminated cylindrical shells are being used in submarine, underground mines, aerospace applications and other civil engineering applications. Buckling is also important factor to decide the failure of the structure. Pressure vessels, submarines and long columns will tend to buckle. To avoid the buckling failure, large amount of material will be used, it results the higher weight of the structure. Generally cylindrical shells such as pressure vessels are manufactured by steel alloys. In present days to reduce the weight of the structures, these are manufacturing by composite materials like carbon epoxy, Glass epoxy. This study aims to increase the design load of laminated composite FRP cylinder under buckling load. Initially a hybrid laminate designed in Ansys workbench by considering six ply angles with all fibres oriented at zero degrees. Response surface optimization used to obtain different optimized fibre orientations in a laminate by considering output parameters as deformation and Inverse Reserve factor. The optimized fibre angles are applied to the Ring stiffened cylinder. The configuration that gives higher load multiplier will attain higher load carrying capacity. Ring stiffened cylinder modelled and Analysis performed in ansys workbench and materials considered are Epoxy carbon and Epoxy S-Glass. The results are compared with theoretical calculations.

Keywords: Fibre Reinforced Polymer composite, Cylinder, Buckling Load

Design & Modal Analysis of Multi Cylinder Petrol Engine Flywheel using Different Materials

Authors: "P.Manoj kumar, K.Baba Saheb, D.Madhava reddy"

Abstract: A flywheel used in machines serves as a reservoir which stores energy during the period when the supply of energy is more than the requirement and releases it during the period when the requirement of energy is more than supply. For example, in I.C. engines, the energy is developed only in the power stroke which is much more than engine load, and no energy is being developed during the suction, compression and exhaust strokes in case of four stroke engines. The excess energy is developed during power stroke is absorbed by the flywheel and releases its to the crank shaft during the other strokes in which no energy is developed, thus rotating the crankshaft at a uniform speed. The flywheel is located on one end of the crankshaft and serves two purposes. First, through its inertia, it reduces vibration by smoothing out the power stroke as each cylinder fires. Second, it is the mounting surface used to bolt the engine up to its load The aim of the project is to design a flywheel for a multi cylinder petrol engine flywheel using the empirical formulas. A parametric model of the flywheel is designed using 3D modeling software Creo. The forces acting on the flywheel are also calculated. The strength of the flywheel is validated by applying the forces on the flywheel in analysis software ANSYS. Structural analysis, modal analysis and fatigue analysis are done on the flywheel. Structural analysis is used to determine whether flywheel withstands under working conditions. Fatigue analysis is done for finding the life of the component. Modal analysis is done to determine the number of mode shapes for flywheel. Analysis is done for two materials Gray Cast Iron and S Glass Epoxy to compare the results.

Keywords: Spur gear, Contact stress, Involute, Pro/Engineer, ANSYS 14.5.

Contact Pressure Analysis of Spur Gear using FEA

Authors: "T.Veera Pratap Reddy, J.Govardhan"

Abstract: This paper is Gear is one of the most critical components in a mechanical power transmission system, and most industrial rotating machinery. Spur gear has teeth cut in parallel to each other and imposes radial loads on shafts. Contact stresses are one of the factors which effects performance of gears transmission. This project work made an attempt to summarize about contact stresses developed in a mating spur gear which has involute teeth. A pair of spur gears are taken from a lathe gear box and proceeded forward to calculate contact stresses on their teeth. Contact failure in gears is currently predicted by comparing the calculated Hertz contact stress to experimentally determined allowable values for the given material. The method of calculating gear contact stress by Hertz’s equation originally derived for contact between two cylinders. Analytically these contact stresses are calculated for different module, and these results are compared with the results obtained in modeling analysis in ANSYS. As there involves many iterations in calculating contact stresses analytically a simplified approach is made in VISUAL BASIC for different parameters like module, power, speed. Etc. A model of mating spur gears is generated in PRO/ENGINEER and this model is imported to ANSYS 14.5 Package. The imported model is analyzed in ANSYS workbench for calculating contact pressure for different module of spur gear. These results are compared with analytical results and thus conclusions are made on observing the results. A result advises that with increase in module, Contact Pressure decreases for a pair of spur gears. Results help us to give better performance and future scope in the power transmission field.

Keywords: Spur gear, Contact stress, Involute, Pro/Engineer, ANSYS 14.5.

Structural Analysis and Balancing Test for Impeller Before Conducting Over Speed Test

Authors: "S.Rakesh, J.Govardhan"

Abstract: — This project is process structural analysis and balancing test for impeller before conducting over speed test of manufacturing a component, it is essential to check various properties of the component that may get changed after the manufacturing process. The Centrifugal Compressor Impellers are manufactured from forgings, which is the basic raw material for impellers. During the process of producing the impeller from the forgings, the forgings have to undergo many machining operations and welding processes. These operations may change the mechanical properties and these changes should be accounted in order to have good performance and accuracy. Since the impeller is a high speed rotating component, some stresses may get induced in it and cause dimensional inaccuracies depending upon the mechanical properties of the component material. Hence each Impeller of the Compressor rotor is individually over speed in a vacuum chamber to a value of 115% of Maximum continuous speed to check the mechanical soundness of the impeller. After that dimensional and Dye checks are carried out on oversped impellers for any permanent deformations and micro cracks at the welds. The whole process should be done before the impeller is made ready to be mounted on the rotor shaft. Before conducting the Over Speed Test (O.S.T.) on the impeller, first it has to be balanced. The reasons for balancing, procedure to be followed and the detailed description of the over speeding test are discussed below.

Keywords: solidworks, ansys

Protected: Health Monitoring and Record System using Embedded Systems

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Authors: Malikarajuna K; P.V.Narayana Rao

Abstract:

Various systems, methods and techniques are in use by patients and medical centers to provide the necessary information and to serve medical profession including hospital information systems. One of the most important services is Personal Health care Record (PHR) portability and management. This problem has become out of history of paper records kept separately by physicians, clinics, hospitals, pharmacies, insurance companies and patients themselves.

Keywords: embedded systems, flash memory

Protected: DETERMINATION OF ISOMORPHISM AMONG PLANAR KINEMATIC CHAINS AND THEIR DERIVED MECHANISMS

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Authors: CH Ramana; Venkata sai B

Abstract:

The detection of isomorphism among kinematic chains and their derived mechanism has been a hot area of research for last several years. In the present communication a resistance distance based computerized method is proposed and it is tested for planar kinematic chains up to ten links.................

Keywords: Distinct Mechanism [DM]; Kinematic Chain [KC];

Protected: Computational Fluid Dynamics Analysis of Economiser

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Authors: Nagaraju Pothula; Swetha Erinki

Abstract:

Economizer is the best mechanical component which is used for trapping the heat of flue gasses. Economizers can be best applied in electricity generating power plants. Best way of utilisation of flue gas heat is by transferring it to the boiler feed water. Hence economizers are designed in such a way that feed water is allowed to pass the economizer through pipes..........................

Keywords: ECONOMIZER, optimization

Protected: ANALYSIS OF EFFECTS OF SUNLIGHT INTENSITY ON TURBO JET ENGINE

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Authors: Shaik Wasim; P venkateswaralu

Abstract:

The reasons behind the raise of the temperature of turbo jet engine of aircrafts was investigated which leads to damaging the engine and costs the government huge expenses in case the plane is on ground and costs lives and expenses in case the aircraft is in flight.......

Keywords: aircraft,turbo engine

Protected: Thermal Analysis of Water Cooled Primary Mirror

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Authors: K Suresh; B Pattabhi

Abstract:

This paper describes the thermal analysis of water cooled primary mirror used in BL-23 of Indus-2 at RRCAT in which the mirror thermal deformation was minimized for acceptable optical performance. The primary mirror separates the visible part from synchrotron radiation by reflecting visible part to perpendicular plane. In worst condition the primary mirror will be subjected to intense heat load of 150 W, primarily due to X-Ray absorption.

Keywords: synchrotron radiation,primary mirror
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