Atomistic Insights into the Effects of Residual Stress during Nanoindentation
The influence of in-plane residual stress on Hertzian nanoindentation for single-crystal copper thin film is investigated using molecular dynamics simulations (MD). It is found that: (i) the yield strength of incipient plasticity increases with compressive residual stress, but decreases with tensile...
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| Format: | Article |
| Language: | English |
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MDPI AG
2017-08-01
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| Series: | Crystals |
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| Online Access: | https://www.mdpi.com/2073-4352/7/8/240 |
| _version_ | 1828116048420798464 |
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| author | Kun Sun Junqin Shi Lifeng Ma |
| author_facet | Kun Sun Junqin Shi Lifeng Ma |
| author_sort | Kun Sun |
| collection | DOAJ |
| description | The influence of in-plane residual stress on Hertzian nanoindentation for single-crystal copper thin film is investigated using molecular dynamics simulations (MD). It is found that: (i) the yield strength of incipient plasticity increases with compressive residual stress, but decreases with tensile residual stress; (ii) the hardness decreases with tensile residual stress, and increases with compressive residual stress, but abruptly drops down at a higher compressive residual stress level, because of the deterioration of the surface; (iii) the indentation modulus reduces linearly with decreasing compressive residual stress (and with increasing tensile residual stress). It can be concluded from the MD simulations that the residual stress not only strongly influences the dislocation evolution of the plastic deformation process, but also significantly affects the size of the plastic zone. |
| first_indexed | 2024-04-11T12:50:48Z |
| format | Article |
| id | doaj.art-8d09ff13a6ff49e4a6f55e113111d135 |
| institution | Directory Open Access Journal |
| issn | 2073-4352 |
| language | English |
| last_indexed | 2024-04-11T12:50:48Z |
| publishDate | 2017-08-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Crystals |
| spelling | doaj.art-8d09ff13a6ff49e4a6f55e113111d1352022-12-22T04:23:13ZengMDPI AGCrystals2073-43522017-08-017824010.3390/cryst7080240cryst7080240Atomistic Insights into the Effects of Residual Stress during NanoindentationKun Sun0Junqin Shi1Lifeng Ma2State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University, Xi’an 710049, ChinaState Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University, Xi’an 710049, ChinaS&V Laboratory, Department of Engineering Mechanics, Xi’an Jiaotong University, Xi’an 710049, ChinaThe influence of in-plane residual stress on Hertzian nanoindentation for single-crystal copper thin film is investigated using molecular dynamics simulations (MD). It is found that: (i) the yield strength of incipient plasticity increases with compressive residual stress, but decreases with tensile residual stress; (ii) the hardness decreases with tensile residual stress, and increases with compressive residual stress, but abruptly drops down at a higher compressive residual stress level, because of the deterioration of the surface; (iii) the indentation modulus reduces linearly with decreasing compressive residual stress (and with increasing tensile residual stress). It can be concluded from the MD simulations that the residual stress not only strongly influences the dislocation evolution of the plastic deformation process, but also significantly affects the size of the plastic zone.https://www.mdpi.com/2073-4352/7/8/240nanoindentationresidual stressplastic deformationmolecular dynamics |
| spellingShingle | Kun Sun Junqin Shi Lifeng Ma Atomistic Insights into the Effects of Residual Stress during Nanoindentation Crystals nanoindentation residual stress plastic deformation molecular dynamics |
| title | Atomistic Insights into the Effects of Residual Stress during Nanoindentation |
| title_full | Atomistic Insights into the Effects of Residual Stress during Nanoindentation |
| title_fullStr | Atomistic Insights into the Effects of Residual Stress during Nanoindentation |
| title_full_unstemmed | Atomistic Insights into the Effects of Residual Stress during Nanoindentation |
| title_short | Atomistic Insights into the Effects of Residual Stress during Nanoindentation |
| title_sort | atomistic insights into the effects of residual stress during nanoindentation |
| topic | nanoindentation residual stress plastic deformation molecular dynamics |
| url | https://www.mdpi.com/2073-4352/7/8/240 |
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