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Sintering of Metal Matrix Nanocomposites Under Shock Wave by Coarse Grained Molecular Dynamics
, M.Sc. Thesis Sharif University of Technology ; Naghdabadi, Reza (Supervisor) ; Mahnama, Maryam ($item.subfieldsMap.e)
Abstract
Nowadays, metal matrix composites due to their magnificent properties, has met diverse applications in automobile, aerospace and military industries. Decreasing the reinforcement size from micro-meter to nano-meter, properties of these structures will be improved significantly. Better properties will lead to better applications for them in the future. Thus, the main objective of the current project was investigation on the mechanical properties of metal matrix nanocomposites produced with shock wave sintering. In order to gain this aim, first the sintering of nanoparticles was modeled. A new model was proposed to consider the neighboring particles effects. Using the model, sintering of many...
Multi-scale Modeling to Obtain an Equivalent Homogeneous Material for Al6061-T6/Al2 O3 Composite and its Application in Machining Simulation
, Ph.D. Dissertation Sharif University of Technology ; Movahedy, Mohammad Reza (Supervisor) ; Sohrabpour, Saeed (Supervisor) ; Mahnama, Maryam ($item.subfieldsMap.e)
Abstract
In this study, an equivalent homogenous material model is proposed for Al6061-T6/Al2O3 metal matrix composite using the hierarchical multi-scale modeling, and the capability of this model in simulation of machining process of this composite is investigated. Molecular dynamic study of the Al/Al2O3 interface is used to obtain the effect of crystallographic orientations and terminations on the tensile and shear strengths at the interface. The Reaxff potential function is employed to estimate the traction-separation relations at Al/Al_2 O_3 interface at temperatures of 300, 400, and 500 K. Next, a cohesive zone model is used at the micro-scale to simulate the interface between the matrix and...