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Developing a Model for Simulation of Dynamic Behavior of Nano-beams

Delafrouz, Pourya | 2016

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 47966 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Nejat, Hossein
  7. Abstract:
  8. The utility of nano-beams in MEMs and NEMs has progressed a lot in recent years. Such systems have found wide spread use in sensors and actuators due to small size, low weight, high accuracy and low energy consumption. By a decrease in size of nano-beams, surface effect increases which makes the classical theories unable to modeling such beams. Therefore new models are required for evaluating the dynamic behavior of nano-beams. In this thesis we have attempted to develop a suitable Coarse-Grain model for analysis of such beams. At first a suitable Coarse-Grain mapping with determined Sutton-Chen potential parameters is introduced for FCC metals. In the next step, EAM is considered as interatomic potential and new parameters are introduced for this model. Then two other models are introduced by considering different masses for atoms of surface, edge and corner for analysis of metallic structures. The last model is developed for situations in which the atoms located near the surface are also considered as having different masses. Having introduced different models, we selected the best of them based on accuracy using static and dynamic simulations. Finally the best model is selected with respect to precision and speed.At the end using the results obtained from the last part we presented three Coarse-Grain models for silicon which has diamond structure and Stillinger-Weber as interatomic potential. The best model is defined by various simulation studies
  9. Keywords:
  10. Molecular Dynamics ; Coarsening Dynamics ; Elastic Properties ; Coarse Grained Model ; Vibration ; Nanobeam

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