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  • 1
    Publication Date: 2018-09-21
    Description: Soldering uses lead as one of its alloying elements because of the low melting point of lead. Recent research has focused on lead free solders as lead is seen as a poisonous elements. In this work, two lead free alloys, namely 88 Sn-7.5Zn-2.5Al-2 In and 88 Sn-7Zn-2 Al-2.5 In were prepared using induction melting method in an argon atmosphere. Melting points of the alloys were 203.7Cellcius and 201.6 Celsius as determined by Differential Scanning Colorimetry (DSC). Vickers hardness tests were conducted. Hardness values were found to be higher than normal lead based soldering alloys. The lead free solders were characterized using Energy Dispersive X-Ray Spectra (EDS). Microstructural studies were also done to study changes in microstructure with Indium.
    Print ISSN: 1757-8981
    Electronic ISSN: 1757-899X
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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  • 2
    Publication Date: 2016-10-31
    Description: Understanding the complex behaviour of the cavity flow is essential for the design of supersonic combustor. The characteristics of the axisymmetric aft ramp cavity with fore wall modification have been experimentally studied in a blow-down type supersonic flow facility. The facility consists of a conventional CD nozzle that issues a flow Mach number of 1.88 to a supersonic combustor of circular cross section, which is placed immediately downstream of the nozzle. The axisymmetric cavities are incorporated within the combustor. The cavities are of open type and their length is kept constant while their depth varies. The aft wall of the cavities is inclined with three ramp angles and the fore wall is provided with a constant fillet radius of 3 mm. The performance of the cavity is analysed based on wall static pressures, momentum flux distribution at the exit of the combustor and stagnation pressure loss across the combustor. The study reveals that fore wall fillet cavities provide ...
    Print ISSN: 1757-8981
    Electronic ISSN: 1757-899X
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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  • 3
    Publication Date: 2017-06-03
    Description: Titanium is known for its strong affinity towards nitrogen. The metal forms a nitride form case of high hardness when the salt bath nitriding is carried out. The selection of Grade 2 Titanium and Grade 5 Ti6Al4V Titanium alloy, stands with the fact that CP Grade 2 Titanium is the most formable and corrosion resistant amongst the pure grades of Titanium and grade 5 alloy is biocompatible and also has excellent tribological properties. This research work attempts to solve the problem of galling by comparing the morphology of the nitride case produced in Commercially Pure Grade 2 Titanium and the nitride formations produced in the Titanium Ti6Al4V alloy through Salt bath nitriding for a time span of 24 hours. Salt Bath Nitriding imparts unique improvements in Roughness, Hardness and Wear resistance of the samples thereby widening the applications of the material.
    Print ISSN: 1757-8981
    Electronic ISSN: 1757-899X
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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  • 4
    Publication Date: 2016-10-12
    Description: There has been a lot of research in recent years to find effective methods for damage detection in structures, usually in following steps: First, localization of damage and second, quantification of the severity of the damage. Present days, there are already a several methods to better understand this domain, some very simple, others quite sophisticated. In this paper, a method is proposed to locate damage based on the estimation of curvatures of the frequency response functions (FRF's). Similarly procedures have been developed in the past, using curvature method of mode shapes. However, the application of the curvatures of the FRF's shows better in damage detection process. Some numerical models like simple beam and plate are presented to estimate the efficiency of the proposed method.
    Print ISSN: 1757-8981
    Electronic ISSN: 1757-899X
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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