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Method for Selecting the Optimal Solution for the Design of the Gear Train

Journal of Mechanics Engineering and Automation 2016年第5期6卷 260-264页

作者： Fajraoui Ayoub Mehdi Kamel urmssdt Engineering National High School of Tunis (ENSIT) University of Tunis (UT) 5 Avenue Taha Hussein P.B.56 Bab Mnara 1008 Tunis Tunisia urmssdt Preparatory Institute for Engineering Studies El Manar (IPEIMa) University of Tun& El Manar (UTM) PB.24 2092 Tunis Tunisia

Some researchers in mechanical engineering have developed systems for the design of gear transmission boxes, but almost no calculation methods exist for widespread synthesis. In this article, we outline methods for automatic determination of toothed helical gear trains and the selection criteria for the optimal choice of gear trains. In this work two methods were applied. As first design to use an expert system for the design and then optimize the design that is why we used Kappa PC and Catia for CAD.

关键词： Support systems for decision gear train design conceptual analysis.

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Experimental and numerical analyses of magnesium alloy hot workability

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Journal of Magnesium and Alloys 2016年第4期4卷 295-301页

作者： F.Abbassi M.Srinivasan C.Loganathan R.Narayanasamy M.Gupta Mechanical engineering department college of engineeringdhofar universityp.o.box 2509211 salalahoman urmssdt ensituniversity of tunis5 avenue taha husseinbp56bâb manara 1008tunisia Department of mechanical engineering chartered institute of technologyabu roadsirohirajasthan 307510india Department of production engineering national institute of technologytiruchirappallitamil nadu 620015india Department of mechanical engineering national university of singapore

Due to their hexagonal crystal structure,magnesium alloys have relatively low workability at room *** this study,the hot workability behavior of cast-extruded AZ31B magnesium alloy is studied through hot compression testing,numerical modeling and microstructural *** deformation tests are performed at temperatures of 250℃ to 400℃ under strain rates of 0.01 to 1.0 s^(−1).Transmission electron microscopy is used to reveal the presence of dynamic recrystallization(DRX),dynamic recovery(DRY),cracks and shear *** predict plastic instabilities during hot compression tests of AZ31B magnesium alloy,the authors use Johnson–Cook damage model in a 3D finite element *** optimal hot workability of magnesium alloy is found at a temperature(T)of 400℃ and strain rate(ε)of 0.01 s^(−1).Stability is found at a lower strain rate,and instability is found at a higher strain rate.

关键词： AZ31B magnesium alloy Hot workability Damage Plastic instability TEM analysis FEM

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