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Length-scale Dependent Dislocation Nucleation during Nanoindentation on Nanosized Gold Islands

Length-scale Dependent Dislocation Nucleation during Nanoindentation on Nanosized Gold Islands. Alex Gonzalez Department of Mechanical Engineering University of Arkansas Fayetteville, AR 72701 USA REU 2 nd Week Seminar – Friday May 29 th , 2009. Literature Background. Molecular Dynamics

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Length-scale Dependent Dislocation Nucleation during Nanoindentation on Nanosized Gold Islands

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  1. Length-scale Dependent Dislocation Nucleation during Nanoindentation on Nanosized Gold Islands Alex Gonzalez Department of Mechanical Engineering University of Arkansas Fayetteville, AR 72701 USA REU 2nd Week Seminar – Friday May 29th, 2009

  2. Literature Background Molecular Dynamics • Requires 3 things: • Interatomic potential energy function, which defines the interactions between atoms • Forces between atoms, which are derived from the binding energies • A numerical method to compute the velocities and positions of atoms in the simulation http://www.fisica.uniud.it/~ercolessi/md/

  3. Literature Background

  4. Methodology and Goals • The objective of this project is to make indentations on nanosized islands of Au to generate dislocations and study the onset of plasticity. • Computer Simulation • Linux • Large-scale Atomic/Molecular Massively Parallel Simulator (LAMMPS) • Ensight • Super Computer “Trillion” • Week 1-3: Visualization • Week 4-5: Initial Testing • Week 6-8: Analysis & additional Simulations • Week 9-10: Report and Presentation Norbert Attig, Kurt Binder, Helmut Grubm¨ uller, Kurt Kremer (Eds.), John von Neumann Institute for Computing, J ¨ ulich, NIC Series, Vol. 23, ISBN 3-00-012641-4, pp. 1-28, 2004.

  5. Overview Step1 Step2 Step3

  6. Nanosized Islands

  7. Nanoindentation • 5.5 μN • (150 nm) • 500 nm • 11 μN (300 nm) Nanoindentation – to probe and analyze the properties of a specimen at nanoscale resolution

  8. Nanosized Islands P5 P6 P3 P2 P4 P1

  9. EnSight simulated Nanoindentation

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