Indentation and scratching of iron by a rotating tool – a molecular dynamics study

[Display omitted] When abrasive particles interact with a surface, besides translational center-of-mass motion also rotational motion of the abrasive may be involved. We perform molecular dynamics simulations of the influence of the rotational motion in a model scenario, where both translational and...

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Bibliographic Details
Published in:Computational materials science 2021-06, Vol.194, p.110445, Article 110445
Main Authors: Alabd Alhafez, Iyad, Ruestes, Carlos J., Bringa, Eduardo M., Urbassek, Herbert M.
Format: Article
Language:English
Subjects:
Dislocations
Drilling
Grinding
Molecular dynamics
Nanoindentation
Nanomachining
Plasticity
Polishing
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Summary:[Display omitted] When abrasive particles interact with a surface, besides translational center-of-mass motion also rotational motion of the abrasive may be involved. We perform molecular dynamics simulations of the influence of the rotational motion in a model scenario, where both translational and rotational velocities are controlled. We find that for angular velocities corresponding to slip-free rolling, the influence of rotation is small and shows up as a decrease of hardness and of friction. The effect is somewhat more pronounced for rolling motion (rotation axis parallel to surface) than for drilling motion (rotation axis perpendicular to surface). Pile-up structures are unaffected. Only if rotational speeds strongly exceed the rolling-without-slip limit, strong effects of the rotational speed are observed: the machined material amorphizes rather than to develop dislocation plasticity, the groove develops oscillatory patterns, and the material hardness is strongly reduced.
ISSN:0927-0256
1879-0801
DOI:10.1016/j.commatsci.2021.110445