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Experimental and numerical investigation of the abrasive waterjet machining of aluminum-7075-T6 for aerospace applications

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Advances in Manufacturing 2021年第2期9卷 286-303页

作者： Joseck Nyaboro Mahmoud Ahmed hassan el-hofy Mohamed el-hofy Department of Industrial and Manufacturing Engineering Egypt-Japan University of Science and Technology(E-JUST)Alexandria 21934Egypt Department of Energy Resources Engineering Egypt-Japan University of Science and Technology(E-JUST)Alexandria 21934Egypt Advanced Manufacturing Research Centre(AMRC)with Boeing The University of SheffieldRotherham S605TZUK

The machining of hard-to-cut materials with a high degree of precision and high surface quality is one of the most critical considerations when fabricating various state-of-the-art engineered components.In this investigation,a comprehensive three-dimensional model was developed and numerically simulated to predict kerf profiles and material removal rates while drilling the aluminum-7075-T6 aerospace alloy.Kerf profile and material removal prediction involved three stages:jet dynamic flow modeling,abrasive particle tracking,and erosion rate pre-diction.Experimental investigations were conducted to validate the developed model.The results indicate that the jet dynamic characteristics and flow of abrasive particles alter the kerf profiles,where the top kerf diameter increases with increasing jet pressure and standoff distance.The kerf depth and hole aspect ratio increase with jet pressure,but decrease with standoff distance and machining time.Crosssectional profiles were characterized by progressive edge rounding and parabolic shapes.Defects can be minimized by utilizing high jet pressure and small standoff distance.The material removal rate increases with increasing jet pressure,abrasive particle size,and exposure time,but decreases with increasing standoff distance.

关键词： Non-traditional machining Abrasive waterjet machining Computational fluid dynamics(CFD) Erosion modeling Kerf characteristics

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electrical Investigation of Some Silver Containing Ceramics Obtained from Coprecipitated Oxalates

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Journal of Materials Science & Technology 1999年第1期15卷 87-90页

作者： M.I.el-hofy(Physics Department, Faculty of Science, Menoufia University, Shebin el-Kom, Egypt)A.M.Donia(Chemistry Department, Faculty of Science, Menoufia University, Shebin el-Kom, Egypt)M.M.Abou-Sekkina(Chemistry Department, Faculty of Science, Taota Un Physics Department Faculty of Science Menoufia University Shebin El-Kom Egypt Chemistry Department Faculty of Science Menoufia University Shebin El-Kom Egypt Chemistry Department Faculty of Science Tanta University Tanta Egypt

Silver-ceramics (Ag2MO2)(M=Co, Ni, or Cu) were prepared through thermal decompositionof coprecipitated oxalates. Pellets of these materials were annealed at 350℃ for different timeperiods up to 5 h. The effect of ann... 详细信息

关键词： CuO Figure electrical Investigation of Some Silver Containing Ceramics Obtained from Coprecipitated Oxalates

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Investigating Double-Regime Crossover in Y1Ba2Cu3 - xRxO7 - δSuperconductors

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Crystal Structure Theory and Applications 2014年第1期3卷 30-37页

作者： Mohamed H. Badr Lubna M. Sharaf el-Deen Mohamed el-hofy Aly A. Haswa Physics Department Faculty of Science Minufiya University Shebin El-Koom Egypt

The effect of Pr and Gd doping on the transport properties of Cu-deficient YBCO superconductors has been studied. Two series of Y1Ba2Cu3 - xRxO7 - δ, where R = Pr or Gd, were prepared by the conventional solid-state reaction technique. Resistance measurements showed a suppression of Tc with increasing of Pr- and Gd-contents in addition to a normal-state metal-to-insulator transition. Moreover, a superconductor-to-insulator transition has been observed at ambient pressure for temperatures less than 50 K for Pr with x = 0.3 and for Gd with x > 0.3. The overall complex behaviours of the resistivity data have been preliminary explained in terms of localization of charge carriers, structural disorders, and magnetic ordering of magnetic moments.

关键词： High Tc Superconductivity Metal-Insulator Transition Superconductor-Insulator Transition

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