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Production and Characterization of Nano Structured Silicon Carbide by High Energy Ball Milling

Journal of Minerals and Materials Characterization and Engineering 2012年第5期11卷 529-541页

作者： J. Babu Rao Dil Kush nrmr bhargava Dept of Metallurgical Engineering Andhra University Visakhapatnam- 530 003 India

The article has been retracted due to the investigation of complaints received against it. The Editorial Board found that substantial portions of the text came from other published paper. Comparing with the paper published in International Journal of Engineering, Science and Technology Vol. 3, No. 4, 2011, pp. 82-88 (***), these two papers have the same contents before Figure 7 and the author added Fig. 8, 9, 10 on the 2012 paper. The scientific community takes a very strong view on this matter, and the Journal of Minerals and Materials Characterization and Engineering (JMMCE) treats all unethical behavior seriously. This paper published in Vol.11 No.5, 529-541, 2012 has been removed from this site.

关键词： Nano particles Silicon carbide High Energy Ball Milling X-ray diffraction SEM.

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Studies on Cold Workability Limits of Brass Using Machine Vision System and its Finite Element Analysis

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Journal of Minerals and Materials Characterization and Engineering 2011年第9期10卷 777-803页

作者： J. Appa Rao J. Babu Rao Syed Kamaluddin nrmr bhargava Dept of Mechanical Engineering GITAM University Visakhapatnam – 530 045 India Dept of Metallurgical Engineering Andhra University Visakhapatnam – 530 003 India

Cold Workability limits of Brass were studied as a function of friction, aspect ratio and specimen geometry. Five standard shapes of the axis symmetric specimens of cylindrical with aspect ratios 1.0 and 1.5, ring, tapered and flanged were selected for the present investigation. Specimens were deformed in compression between two flat platens to predict the metal flow at room temperature. The longitudinal and oblique cracks were obtained as the two major modes of surface fractures. Cylindrical and ring specimen shows the oblique surface crack while the tapered and flanged shows the longitudinal crack. Machine Vision system using PC based video recording with a CCD camera was used to analyze the deformation of 4 X 4 mm square grid marked at mid plane of the specimen. The strain paths obtained from different specimens exhibited nonlinearity from the beginning to the end of the strain path. The circumferential stress component Os increasingly becomes tensile with continued deformation. On the other hand the axial stress Oz , increased in the very initial stages of deformation but started becoming less compressive immediately as barreling develops. The nature of hydrostatic stress on the rim of the flanged specimen was found to be tensile. Finite element software ANSYS has been applied for the analysis of the upset forming process. When the stress values obtained from finite element analysis were compared to the measurements of grids using Machine Vision system it was found that they were in close proximity.

关键词： Friction Upsetting Vision System Finite Element Analysis

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