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Multi-scale Modeling to Obtain an Equivalent Homogeneous Material for Al6061-T6/Al2 O3 Composite and its Application in Machining Simulation

Sazgar, Amjad | 2016

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  1. Type of Document: Ph.D. Dissertation
  2. Language: Farsi
  3. Document No: 49413 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Movahedy, Mohammad Reza; Sohrabpour, Saeed; Mahnama, Maryam
  7. Abstract:
  8. 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 particles within a representative volume element (RVE) and its results are verified by comparison to result of micro-scale tensile test at strain rates of 200 and 400 (1/s) .Using the multi-scale model, several cases of deformation of Al6061-T6/Al2O3 composite at different strain rates and different volume fractions of reinforcement particles are simulated. These simulations are used to obtain an equivalent homogeneous behavior model (EHM) for the Al6061-T6/Al2O3 composite. The EHM material model is employed in simulation of machining process, and its capability in modeling of the process is investigated by comparing with experimental results. These results confirm that the proposed equivalent homogenous material from hierarchical multi-scale model provides a good representation of the behavior of composites under machining conditions, and is capable of predicting the cutting forces of the Al6061-T6/Al_2 O_3 metal matrix composite
  9. Keywords:
  10. Molecular Dynamics ; Metal Matrix Composite (MMC) ; Machining ; Cohesive Zone Model ; Multiscale Hierarchical Analysis ; Reax FF Potential Function ; Equivalent Homogenous Material Model

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