Trends in Machine Design May- August 2014
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Trends in Machine Design Focus and Scope Covers ? Kinematics of Machines ? CAD/CAM/CAE technology ? CAD/CAM/CAE technology ? Mechatronic design ? Machine manufacturing processes ? Machine learning algorithms
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I take the privilege to present the print version for the [Volume 1 Issue (2)] of Trends in Machine Design. The intension of TMD is to create an atmosphere that stimulates creativeness, research and growth in the area of Machine Design. The development and growth of the mankind is the consequence of brilliant Research done by eminent Scientists and Engineers in every field. TMD provides an outlet for Research findings and reviews in areas of Machine Design found to be relevant for National and International recent developments & research initiative. The aim and scope of the Journal is to provide an academic medium and an important reference for the advancement and dissemination of Research results that support high level learning, teaching and research in the domain of Machine Design. Finally, and Authors for their continued support and invaluable contributions and suggestions in the form of authoring I express my sincere gratitude and thanks to our Editorial/ Reviewer board write ups/ reviewing and providing constructive comments for the advancement of the journals. With regards to their due continuous support and co-operation, we have been able to publish quality Research/Reviews findings for our customers base. I hope you will enjoy reading this issue and we welcome your feedback on any aspect of the Journal.
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Trends in Machine Design
Contents
1. Gas Foil Bearings with Different Bump Foil Materials T. Moasunep. Jamir, S. K. Kakoty, Karuna Kalita
1
2. Workability Behavior of Copper–Tungsten and Graphite Composites M. Navaneetha Krishnan, S.C. Vettivel, G. Karthikeyan
12
Trends in Machine Design Volume 1, Issue 2 www.stmjournals.com
Gas Foil Bearings with Different Bump Foil Materials T. Moasunep. Jamir, S. K. Kakoty*, Karuna Kalita Department of Mechanical Engineering, Indian Institute of Technology, Guwahati-781039, India Abstract There is a significant attention on gas foil bearings (GFBs) in recent times owing to its oil-free technology and suitability over a wide array of operating conditions. However, GFBs have considerably low load carrying capacity as compared to normal gas bearings (GBs). The present paper investigated the static analysis and comparison of the load capacity of the bump-type GFBs for a simple foil configuration considering only deflection of bump foils. Different foil materials have been inspected in view of comparing the steady state load capacity. Also the variations of GFBs load performance with respect to the compliance of the foil have been reviewed.
Keywords: gas foil bearings, static analysis, steady state load capacity, foil compliance coefficient
TMD (2014)Š STM Journals 2014. All Rights Reserved
Trends in Machine Design Volume 1, Issue 2 www.stmjournals.com
Workability Behavior of Copper–Tungsten and Graphite Composites M. Navaneetha Krishnan1*, S.C. Vettivel2, G. Karthikeyan3 1
Department of Mechanical Engineering, Universal College of Engineering and Technology, Vallioor, India 2 Department of Mechanical Engineering, VV Engineering College, Tisaiyanvilai, India 3 Department of Mechanical Engineering, Regional Centre of Anna University, Tirunelveli, India
Abstract Workability is a measure of deformation that powder metallurgy materials can withstand prior to fracture occurring in the formation or upsetting process. Nowadays, copperbased sintered composites produced by powder metallurgy processes are widely used in bearings and bushes. Also composites based on copper–tungsten (Cu–W) composite containing a solid lubricant (Graphite) have been developed as self-lubricating materials under the conditions of load, atmosphere and temperature. However, it should be noted that the addition of W has an adverse effect on the composites mechanical properties. In this paper the workability behavior of Cu reinforced with W and Gr composite was studied. Gr is a solid lubricant which is used to reduce friction. The various proportions of copper and tungsten powders are mixed with respect to different weight percentage (Pure Cu with 5% Gr, 90% Cu & 5% W with 5% Gr, 85% Cu & 10% W with 5% Gr) and specimen were prepared. The microstructures of the sintered specimens were examined. The compressibility test was conducted using Universal Testing Machine (UTM). The preparation and characterization are clearly discussed in this paper.
Keywords: workability, Formability Stress Index, Metal Matrix Composites (MMCs), powder metallurgy, relative density
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