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Nano/Meso Scale Effects on Crystal Plasticity - Collaborative Research Summary

This collaborative research project, NANOMESO, aims to understand and predict unique plasticity phenomena at nano and submicron scales. The project offers a unique educational experience to US PhD students, combining the expertise of 7 Principal Investigators from the US, Germany, Switzerland, and the Netherlands. Highlighting techniques such as Molecular Dynamics and Dislocation Dynamics, the project explores novel testing methods and the quantized plasticity of materials like single crystal gold pillars. Results include the percolation of plastic slip in nanocrystalline Nickel and advancements in Quantized Crystal Plasticity. Learn more at the NANOMESO website.

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Nano/Meso Scale Effects on Crystal Plasticity - Collaborative Research Summary

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  1. NANOMESO:A NSF-EC Cooperative Activity onNano/Meso Scale Effects on Crystal PlasticityPeter M. Anderson and Ju Li, Ohio State Univ. DMR 0502711William D. Nix, Stanford University, DMR 0502208 NANOMESO Web Site: http://www.mse.osu.edu/~andersonp/nanomeso.html Goals: • Understand and predict unique plasticity phenomena at nano and submicron scales • Offer unique educational experience to 3 US PhD students: joint expertise of 7 PIs in US, Germany, Switzerland, Netherlands.

  2. 1000 Diam=290nm 310nm Compressive stress (MPa) 500 400nm 420nm Bulk strength 0 0 0.1 0.2 0.3 0.4 compressive strain Techniques: Molecular Dynamics PeierlsMethod DislocationDynamics NovelTesting Ab initio Highlights: Novel Testing: smaller is stronger!Basis: Compressive test results (below) of single crystal gold <001> pillars Molecular Dynamics: Quantized Plasticity! Basis: MD studies, Paul Scherrer Institute (Switzerland) New Finite Element Approach: Quantized Crystal Plasticity (QCP) Result showing percolation of plastic slip in nc Ni Anderson & Li (Ohio State);Van Swygenhoven, Bitzek (Paul Scherrer Institute) Nix et al, Stanford (Diam = pillar diameter)

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