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Effect of Particulate Reinforcement on the Mechanical Properties of Al2024-WC MMCs

Journal of Minerals and Materials Characterization and Engineering 2015年第6期3卷 469-476页

作者： k. punith gowda J. N. Prak.sh Shivashank.re gowda B. Satish Babu Department of Mechanical Engineering East West Institute of Technology Bengaluru India St Johns College of Engineering and Technology Yemmiganur India Swarnandhra Institute of Engineering & Technology Narasapur India

The present work.reveals the study of mechanical properties of Al2024-Tungsten carbide MMCs containing tungsten carbide (WC) particulates. The reinforcing particulates in the Al2024 alloy were varied from 0% to 5% by weight. The vortex method of cast production was employed to fabricate the MMCs, in which the reinforcement was poured into the vortex created by stirring the molten metal by means of a mechanical agitator. The composite so produced was subjected to a series of mechanical tests. The results of this study revealed that as the tungsten carbide particle content was increased, there were significant increases in the ultimate tensile strength, hardness and young’s modulus, compressive strength, accompanied by a reduction in its ductility. An attempt is made in the paper to provide explanations for these phenomena.

关键词： Aluminium 2024 Alloys Tungsten Carbide Stir Casting Mechanical Properties

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Significance of Stefan blowing effect on flow and heat transfer of Casson nanofluid over a moving thin needle

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Communications in Theoretical Physics 2021年第9期73卷 51-58页

作者： A M Jyothi R Naveen k.mar R J punith gowda B C Prasannak.mara Bangalore Institute of Technology BangaloreIndia Department of Studies and Research in Mathematics Davangere UniversityDavangere-577002KarnatakaIndia

The current mathematical model explains the influence of non-linear thermal radiation on the Casson liquid flow over a moving thin needle by considering Buongiorno’s nanofluid *** influences of Stefan blowing,Dufour and Soret effects are also considered in the *** equations which represent the described flow pattern are reduced to ordinary differential equations(ODEs)by using apt similarity transformations and then they are numerically solved with Runge–k.tta-Fehlberg’s fourth fifth-order method(Rk.-45)with shooting *** impacts of pertinent parameters on thermal,mass and velocity curves are deliberated *** friction,rate of heat and mass transfer are also discussed *** reveal that,the increase in values of Brownian motion,thermophoresis,Dufour number,heating and radiative parameters improves the heat *** increasing values of the Schmidt number deteriorates the mass transfer but a converse trend is seen for increasing values of the Soret ***,the escalating values of the radiative parameter decays the rate of heat transfer.

关键词： moving thin needle Brownian motion and thermophoretic diffusion non-linear thermal radiation Stefan blowing condition

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