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Full-Text Articles in Mechanical Engineering
Mobile 3d Printing Of Rail Track Surface For Rapid Repai, Ershad Mortazavian
Mobile 3d Printing Of Rail Track Surface For Rapid Repai, Ershad Mortazavian
UNLV Theses, Dissertations, Professional Papers, and Capstones
The frequent replacement of worn rails on tracks brings an immense economic burden on the railroad industry, and also causes significant interruptions to railroad operation. Restoration of worn rails via additive manufacturing, i.e., 3D printing, can considerably reduce the associated maintenance costs.The scope of this dissertation is to utilize metal additive manufacturing (AM) technology to repair worn rails that are used in the U.S. railway transportation system (e.g. 75-lb/yd light transit rails, or 136-lb/yd heavy freight rails). More specifically, this study aims to understand the interactive mechanisms between the deposited materials and the high-carbon rail steel to identify and alleviate …
Carbon Fiber Coil Spring Characterization And Manufacturing, Cooper Madrazo
Carbon Fiber Coil Spring Characterization And Manufacturing, Cooper Madrazo
UNLV Theses, Dissertations, Professional Papers, and Capstones
Helical coil springs are used in many mechanical design applications including industrial machines, devices, and vehicle suspension systems. It is desirable to minimize the weight of vehicle suspension systems as this can improve performance and handling. Most vehicle suspension coil springs are made from solid steel alloys or other metallic materials. Significant weight savings could be achieved if the metallic material were replaced by high performance fiber reinforced polymer composites. However, the coil spring geometry is a difficult manufacturing challenge for composite materials. The goal of this thesis was to investigate efficient and low-cost manufacturing methods to produce light-weight polymer …