Plastic Deformation at the Nanoscale

By Marisol Koslowski

Mechanical Engineering, Purdue University, West Lafayette, IN

Published on

Abstract

We usually experience the way objects deform plastically on a macroscopic scale. From a car crash to the bending of a paper clip plastic deformation occurs in the form of a smooth flow as a response of an applied stress. But due to the constant shrinking on the dimensions of mechanical devices -such as micro electro mechanical systems (MEMS) and micro electronic interconnects- the notion that plasticity is governed not by a steady flow but by the occurrence of intermittent avalanches of defects moving through the material is gaining increasing attention.

To model the deformation of metallic materials at micron and submicron scales a continuum theory of dislocations is derived. We will introduce the MicroMechanics Simulation Tool and the NanoPlasticity Lab. Both tools are dislocation mechanics simulations for the prediction of plastic deformation of metals. We will show some simulations that show the formation of structures and their influence in macroscopic deformation as for example the dependence on the yield stress on a characteristic size of the sample.

Bio

Marisol Koslowski Marisol Koslowski is an Associate Professor of Mechanical Engineering at Purdue University. Prior to joining Purdue she was a Staff Member and a postdoctoral scholar in the Theoretical Division in Los Alamos National Laboratory. Marisol Koslowski received the Leon Heller award for a postdoctoral publication in Theoretical Physics from Los Alamos National Laboratory in 2006. She received her B.S. degree in Physics in 1997  from the University of Buenos Aires, Argentina and her M.S in 1999 and her Ph. D. in Aeronautics in 2003 from the California Institute of Technology.

Koslowski’s group has extensive experience on simulating the effect of grain boundaries and dislocations on the response of crystalline materials and damage and failure due to crack propagation in composites.

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Cite this work

Researchers should cite this work as follows:

  • Marisol Koslowski (2015), "Plastic Deformation at the Nanoscale," http://nanohub.org/resources/22699.

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Time

Location

Discovery Learning Center, Room 131, Purdue University, West Lafayette, IN

Tags

Plastic Deformation at the Nanoscale
  • Plastic deformation at the nanoscale 1. Plastic deformation at the nan… 0
    00:00/00:00
  • Examples 2. Examples 57.8244911578245
    00:00/00:00
  • Yield (engineering) 3. Yield (engineering) 195.56222889556224
    00:00/00:00
  • Plastic deformation at nanoscale 4. Plastic deformation at nanosca… 366.66666666666669
    00:00/00:00
  • Plastic deformation 5. Plastic deformation 542.97630964297628
    00:00/00:00
  • Micro-Macro connection 6. Micro-Macro connection 674.708041374708
    00:00/00:00
  • Phase field dislocation dynamics 7. Phase field dislocation dynami… 714.61461461461465
    00:00/00:00
  • Plastic deformation of Acetaminophen 8. Plastic deformation of Acetami… 808.74207540874215
    00:00/00:00
  • Stability-Amorphous phase 9. Stability-Amorphous phase 843.20987654320993
    00:00/00:00
  • Costa, 2006. Holec, 2007 10. Costa, 2006. Holec, 2007 913.646980313647
    00:00/00:00
  • Threading dislocations in GaN/InN 11. Threading dislocations in GaN/… 969.336002669336
    00:00/00:00
  • Nanocrystalline Nickel 12. Nanocrystalline Nickel 1007.007007007007
    00:00/00:00
  • Dislocation evolution 13. Dislocation evolution 1080.5805805805805
    00:00/00:00
  • Avalanches-SOC: plastic deformation 14. Avalanches-SOC: plastic deform… 1119.5528862195529
    00:00/00:00
  • Avalanches-SOC 15. Avalanches-SOC 1256.2896229562896
    00:00/00:00
  • Intermittent dislocation flow in plastic deformation 16. Intermittent dislocation flow … 1354.9549549549549
    00:00/00:00
  • Scale-free dislocation avalanches 17. Scale-free dislocation avalanc… 1379.5795795795796
    00:00/00:00
  • Yield (engineering) 18. Yield (engineering) 1441.8084751418085
    00:00/00:00
  • Length scales in crystal plasticity 19. Length scales in crystal plast… 1530.0967634300969
    00:00/00:00
  • Length scales in crystal plasticity 20. Length scales in crystal plast… 1617.1504838171506
    00:00/00:00
  • Inverse Hall-Petch 21. Inverse Hall-Petch 1713.546880213547
    00:00/00:00
  • Dislocation and GB mediated plastic deformation 22. Dislocation and GB mediated pl… 1836.9035702369035
    00:00/00:00
  • Dislocations + GB sliding 23. Dislocations + GB sliding 1855.7223890557225
    00:00/00:00
  • Hall-Petch inverse Hall-Petch 24. Hall-Petch inverse Hall-Petch 1900.5672339005673
    00:00/00:00
  • Run the same simulations 25. Run the same simulations 1932.7660994327662
    00:00/00:00
  • Video of Simulations 26. Video of Simulations 2081.5148481815149
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