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Multicriteria Optimization, Sensitivity Analysis, and Prediction of Bond Characteristics of Vacuum Diffusion Bonded Aero Engine Ti6Al4V Alloy Joints

SAE International Journal of Aerospace

Annamalai University, India-T. Pragatheswaran, S. Rajakumar, V. Balasubramanian, S. Kavitha
Materials Group, Gas Turbine Research Establishment (GTRE), India-Vijay Petley, Shweta Verma
  • Journal Article
  • 01-12-02-0008
Published 2019-12-13 by SAE International in United States
Joining titanium (Ti) alloys with conventional processes is difficult due to their complex structural properties and ability of phase transformation. Concerning all the difficulties, diffusion bonding is considered as an appropriate process for joining Ti alloys. Ti6Al4V, which is an α+β alloy widely used for aero engine component manufacturing, is diffusion bonded in this investigation. The diffusion bonding process parameters such as bonding temperature, bonding pressure, and holding time were optimized to achieve desired bonding characteristics such as shear strength, bonding strength, bonding ratio, and thickness ratio using response surface methodology (RSM). Empirical relationships were developed for the prediction of the bond characteristics, and sensitivity analysis was performed to determine the increment and decrement tendency of the shear strength with respect to the bonding parameters. Various criteria were applied to achieve the desired bond characteristics and their effects; optimum values and limits were evaluated through graphical and numerical optimization. The predicted and experimented results are validated and found that they are in good agreement with each other. The microstructural examination and X-ray diffraction (XRD) analysis…
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Performance and Emission Analysis of a Single Cylinder Constant Speed Diesel Engine Fuelled with Diesel-Methanol-Isopropyl Alcohol Blends

Annamalai University, India-Saravanan Ganapathy
AVC College of Engineering,India-Sundarraj Chockalingam
Published 2012-09-10 by SAE International in United States
Performance of a compression ignition engine fuelled with Diesel Methanol blends with Isopropyl alcohol is evaluated. A single-cylinder, air-cooled, direct injection diesel engine developing a power output of 5.2 kW at 1500 rev/min is used. Base data is generated with standard diesel fuel, four fuel blends namely 80:10:10, 70:20:10, 60:20:20 and 50:30;20 percentages by volume of diesel, methanol and isopropyl alcohol were prepared and tested in the diesel engine. Engine performance and emission data were used to optimize the blends for reducing emission and improving performance. Results show improved performance with blends compared to neat fuel. However, 60:20:20 blends recorded a brake thermal efficiency of 35.92% against 30.6% for the neat diesel at maximum brake power without much change in smoke density and NOx emissions. However, little increase in HC emissions were recorded up to 60:20:20 blends and the increase is drastic when the methanol content is above 20%
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