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Bending the rules: Strain accommodation in layered crystalline solids through nanoscale buckling over dislocations.
- Source :
-
Journal of the Mechanics & Physics of Solids . Jan2024, Vol. 182, pN.PAG-N.PAG. 1p. - Publication Year :
- 2024
-
Abstract
- Basal dislocations and ripplocations both offer explanations for the deformation of layered crystalline solids in response to compressive strain. Existing work, however, presents no clear definition of a ripplocation and the distinction between these two mechanisms remains unclear. Molecular dynamics simulations in graphite and modified graphitic models reveal that equivalent additional half-planes of material can induce both dislocations and ripplocations. In this work, we find that ripplocations are essentially an elastic buckling phenomenon operating at the atomic scale, rather than a discrete crystallographic defect. Dislocation core confinement produces incommensurate planar elastic strains with sufficient energy to trigger a buckling instability that transfers strain energy to the surrounding lattice. The interplay between incommensurate strain and buckling is a quasi-continuum phenomenon where both mechanisms may accommodate arbitrary disregistry, not only the discrete values accommodated by perfect or partial basal dislocations. The mechanistic transition depends critically on the atomic-scale interfacial energies between layers and the continuum elastic behavior of the bulk material. Buckling is possible, though unfavorable, in the MAX phase Ti 3 AlC 2 and systems of multiple layers buckle at lower strains than only a single layer. These extensions of the ripplocation model in van der Waals layered solids suggest that nanoscale elastic buckling potentially plays a role in the deformation of a wide range of layered crystalline systems in response to common mechanical configurations. [ABSTRACT FROM AUTHOR]
- Subjects :
- *CRYSTALS
*CRYSTAL defects
*STRAIN energy
*MOLECULAR dynamics
Subjects
Details
- Language :
- English
- ISSN :
- 00225096
- Volume :
- 182
- Database :
- Academic Search Index
- Journal :
- Journal of the Mechanics & Physics of Solids
- Publication Type :
- Periodical
- Accession number :
- 173945893
- Full Text :
- https://doi.org/10.1016/j.jmps.2023.105450