Journal
MATERIALS
Volume 14, Issue 18, Pages -Publisher
MDPI
DOI: 10.3390/ma14185220
Keywords
nanoindentation; avalanches; pop-ins
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Funding
- EU [857470]
- FNP [MAB PLUS/2018/8]
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The pop-in effect in nanoindentation of metals and the indentation size effect were studied through large scale molecular dynamics simulations, investigating the coupled effects of prestrain, resulting dislocations, and surface morphology on the mechanical response in indentation processes. The study provides detailed insights into the deformation mechanisms and microstructure-property relationships of nanoindentation in the presence of residual stresses and strains.
The pop-in effect in nanoindentation of metals represents a major collective dislocation phenomenon that displays sensitivity in the local surface microstructure and residual stresses. To understand the deformation mechanisms behind pop-ins in metals, large scale molecular dynamics simulations are performed to investigate the pop-in behavior and indentation size effect in undeformed 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 conducted to investigate the coupled effects of prestrain and 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 microstructure-property relationships of nanoindentation in the presence of residual stresses and strains.
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