Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

A Molecular Dynamics Simulations Study of the Influence of Prestrain on the Pop-in Behavior and Indentation Size Effect in Cu Single Crystals

Version 1 : Received: 5 August 2021 / Approved: 6 August 2021 / Online: 6 August 2021 (08:13:54 CEST)

A peer-reviewed article of this Preprint also exists.

Xu, R.; Song, H.; Leng, Y.; Papanikolaou, S. A Molecular Dynamics Simulations Study of the Influence of Prestrain on the Pop-In Behavior and Indentation Size Effect in Cu Single Crystals. Materials 2021, 14, 5220. Xu, R.; Song, H.; Leng, Y.; Papanikolaou, S. A Molecular Dynamics Simulations Study of the Influence of Prestrain on the Pop-In Behavior and Indentation Size Effect in Cu Single Crystals. Materials 2021, 14, 5220.

Journal reference: Materials 2021, 14, 5220
DOI: 10.3390/ma14185220

Abstract

The pop-in effect in nanoindentation of metals represents a major collective dislocation phenome-non that displays sensitivity in the local surface microstructure and residual stresses. To under-stand the deformation mechanisms behind pop-ins in metals, large scale molecular dynamics simulations are carried out to investigate the pop-in behavior and indentation size effect in unde-formed and deformed Cu single crystals. Tensile loading, unloading and reloading simulations are performed to create a series of samples subjected to a broad range of tensile strains with/without pre-existing dislocations. The subsequent nanoindentation simulations are con-ducted to study the coupled effects of pre-strain, the presence of resulting dislocations and surface morphology, as well as indenter size effects on the mechanical response in indentation processes. Our work provides detailed insights into the deformation mechanisms and microstruc-ture-property relationships of nanoindentation in the presence of residual stresses and strains.

Keywords

nanoindentation; avalanches; pop-ins

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