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doi:10.22028/D291-39107
Titel: | Green’s function molecular dynamics meets discrete dislocation plasticity |
VerfasserIn: | Venugopalan, Syam P. Müser, Martin Nicola, Lucia |
Sprache: | Englisch |
Titel: | Modelling and simulation in materials science and engineering |
Bandnummer: | 25 |
Heft: | 6 |
Verlag/Plattform: | IOP Publishing |
Erscheinungsjahr: | 2017 |
DDC-Sachgruppe: | 500 Naturwissenschaften |
Dokumenttyp: | Journalartikel / Zeitschriftenartikel |
Abstract: | Metals deform plastically at the asperity level when brought in contact with a counter body even when the nominal contact pressure is small. Modeling the plasticity of solids with rough surfaces is challenging due to the multi-scale nature of surface roughness and the length-scale dependence of plasticity. While discrete-dislocation plasticity (DDP) simulations capture size-dependent plasticity by keeping track of the motion of individual dislocations, only simple two-dimensional surface geometries have so far been studied with DDP. The main computational bottleneck in contact problems modeled by DDP is the calculation of the dislocation image fields. We address this issue by combining two-dimensional DDP with Green's function molecular dynamics. The resulting method allows for an efficient boundary-value-method based treatment of elasticity in the presence of dislocations. We demonstrate that our method captures plasticity quantitatively from single to many dislocations and that it scales more favorably with system size than conventional methods. We also derive the relevant Green's functions for elastic slabs of finite width allowing arbitrary boundary conditions on top and bottom surface to be simulated. |
DOI der Erstveröffentlichung: | 10.1088/1361-651X/aa7e0e |
URL der Erstveröffentlichung: | https://iopscience.iop.org/article/10.1088/1361-651X/aa7e0e |
Link zu diesem Datensatz: | urn:nbn:de:bsz:291--ds-391070 hdl:20.500.11880/35263 http://dx.doi.org/10.22028/D291-39107 |
ISSN: | 1361-651X 0965-0393 |
Datum des Eintrags: | 21-Feb-2023 |
Fakultät: | NT - Naturwissenschaftlich- Technische Fakultät |
Fachrichtung: | NT - Materialwissenschaft und Werkstofftechnik |
Professur: | NT - Prof. Dr. Martin Müser |
Sammlung: | SciDok - Der Wissenschaftsserver der Universität des Saarlandes |
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