Nanoscale Tensile Testing with Molecular Dynamics
In this computational lab you will perform online molecular dynamics (MD) simulations through nanoHUB of single-crystal copper nanowires under uniaxial tension of varying orientations and analyze the results in order to:
- Observe how slip planes in single-crystal nanowires are formed and explain plastic deformation at the atomic level in terms of dislocation motion and slip.
- Identify the characteristic features of stress-strain curves of nanoscale materials (i.e., elastic region, plastic region, Young’s modulus, yield stress)
- Differentiate plastic deformation for macro- versus nanoscale metals. Compare and contrast Young’s modulus, yield strength, and strain hardening between nanoscale, initially defect-free, single crystal samples and macroscale, polycrystalline samples
- Use critical resolved shear stress and crystallography to determine active slip systems
This module uses the Nanomaterial Mechanics Explorer: https://nanohub.org/tools/nanomatmech
Another learning module uses the same simulation tool and setup and couples it with an experimental tensile testing lab.
- Coughlan, A. et al. Tensile Testing Laboratory: Nanoscale and Macroscale Metal Samples. https://nanohub.org/resources/23130
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