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• W2080198623 abstract "• We model single asperity nano-scale frictional sliding contact in MD. • We present a new method to compute the energy stored in plastic zones. • Computed friction coefficients can be size independent even if plastic mechanisms are not. • Our results reveal the rate dependency of friction. • We show that fundamentally different deformation mechanisms exist in single- and polycrystals. Atomistic models for friction suffer from the severe length- and time-scale restrictions of molecular dynamics. In this paper, a novel approach to quantify the scratching work and the energy associated with plastic activity is used. The approach is combined with a statistical criterion to determine the significance of simulation box size, microstructure and sliding rate effects on the friction coefficient. This method is applied to a large parametric molecular dynamics study of single-asperity nanoscratch on monocrystalline and polycrystalline aluminium substrates. The results show that even though simulation size affects the plastic core mechanisms of sliding friction, the method overcomes size dependence when it comes to the predicted value of the friction coefficient. We show that friction in monocrystalline and polycrystalline substrates activates very different mechanisms and describe them in some detail for the polycrystalline case. Furthermore, we show that even when the friction coefficient appears to be size independent over a range of simulation box sizes, the plastic activity associated with it remains non-monotonically size dependent." @default.
• W2080198623 created "2016-06-24" @default.
• W2080198623 creator A5007064413 @default.
• W2080198623 creator A5027731765 @default.
• W2080198623 date "2014-02-01" @default.
• W2080198623 modified "2023-10-03" @default.
• W2080198623 title "Plastic activity in nanoscratch molecular dynamics simulations of pure aluminium" @default.
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• W2080198623 doi "https://doi.org/10.1016/j.ijplas.2013.07.005" @default.
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