Quasicontinuum investigation of the feedback effects on friction behavior of an abrasive particle over a single crystal aluminum substrate

A multiscale model is developed to investigate the effects of energy feedback on frictional behavior in non-adhesion sliding problems. Released elastic strain energy beneath the scratched surface is termed as the feedback energy here. The analyses are carried out from the perspectives of the surface microstructural evolution and mechanical friction coefficient prediction. Captured mechanisms indicate that the scratched surface undergoes a series of plasticity events (lattice-distortion-induced amorphization, twining formation) on account of the energy feedback. The friction coefficients from this model are compared with those in the relevant plowing model and viscoelastic model. The comparisons reveal that the effects of elastic unloading caused by the energy feedback would be weakened by the gathering of dislocation and intensifying of plastic deformation.