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      •   BUIR Home
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      • Bilkent Theses
      • Theses - Department of Mechanical Engineering
      • Dept. of Mechanical Engineering - Master's degree
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      An experimental approach to nanomechanical buckling and snap-through phenomenon

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      Embargo Lift Date: 2020-03-06
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      Author
      Hatipoğlu, Utku
      Advisor
      Hanay, Mehmet Selim
      Date
      2019-09
      Publisher
      Bilkent University
      Language
      English
      Type
      Thesis
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      Abstract
      Buckling has received little attention as a valuable resource for engineering applications since it is regarded as a type of failure in civil and mechanical engineering. Nevertheless, buckling has a great potential in nanoelectromechanical systems(NEMS) field as a bistable process that has rich and complex dynamics. Here, we explore post buckling dynamics of a nano-beam experimentally by employing various probing techniques. By employing an all-electronic architecture, we precisely control the buckling amount as well as buckling direction of the nano-beam which eventually gives us the ability to control a two-level mechanical system with high precision and speed. A full control over the potential energy landscape of the system is demonstrated with different techniques such as Scanning Electron Microscopy operated in three different modes and microwave coupling method. During proof of concept experiments, left and right buckling, large deflection buckling, nonvolatility – which is an indication of pure bistable states – and snap-through phenomenon is demonstrated. Further steps of the study focused on the snap-through phenomenon that is the interstate transitions of the buckling beam after bifurcation. During these experiments, more involved relations are investigated such as mechanical bias and effect of plastic deformation as well as the effect of actuation scheme on interstate jumps. Moreover, to obtain a better grasp of post-buckling dynamics, quantitative measurements are carried out which reveal the reaction speed of the system and time scale of interstate jumps. Lastly, oscillatory snap-through motion is observed in some special conditions that can be beneficial to understand noise dynamics of the system and it has a potential to contribute energy harvesting applications.
      Keywords
      Buckling
      Post-buckling
      Nanoelectromechanical systems
      NEMS
      Snap-through
      Bistability
      Two-level system
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      http://hdl.handle.net/11693/52401
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      • Dept. of Mechanical Engineering - Master's degree 66
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