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¹School of Materials Science and Engineering, The University of New South Wales, Sydney, NSW 2052, Australia. weifu.sun518@gmail.com weifu.sun@unsw.edu.au.

|November 5, 2013

Summary

High-speed nanoscale contacts reveal an elastic-plastic transition, showing increased hardness and volume reduction during compression. Simulation results closely match experimental data for impact dynamics.

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Area of Science:

Materials Science
Nanotechnology
Physics

Background:

Nanoscale mechanical contacts exhibit complex behaviors under high-speed impacts.
Understanding the elastic-plastic transition is crucial for predicting material response.

Purpose of the Study:

To investigate the elastic-plastic transition in high-speed nanoscale contacts.
To analyze deformation mechanisms and hardening effects at the nanoscale.

Main Methods:

Simulations of nanoscale mechanical contacts.
Measurement of physical quantities: contact forces, radius, stress, coefficient of restitution, and impact time.
Comparison with Hertz and Thornton models, experimental, and theoretical predictions.

Main Results:

Elastic-plastic transition observed when impact speed exceeds Y/ρc0.
Apparent elastic modulus and hardness are higher than bulk values.
Contact radius, coefficient of restitution, and impact time show specific dependencies on impact speed.

Conclusions:

Simulation results align well with experimental and theoretical predictions.
Continuum predictions may underestimate contact radius and overestimate impact time.
An adapted theoretical equation can predict final contact radius during normal impact.