Elastic constants of tetrahedral amorphous carbon films: the effect of intrinsic stresses
| Autor: | H.U. Jäger, A.Yu. Belov |
|---|---|
| Rok vydání: | 2002 |
| Předmět: |
Yield (engineering)
Materials science Hydrostatic pressure chemistry.chemical_element Equations of motion Thermodynamics Surfaces and Interfaces General Chemistry Condensed Matter Physics Surfaces Coatings and Films Stress (mechanics) Molecular dynamics Amorphous carbon chemistry Materials Chemistry Thin film Carbon |
| Zdroj: | Surface and Coatings Technology. :128-132 |
| ISSN: | 0257-8972 |
| DOI: | 10.1016/s0257-8972(01)01625-5 |
| Popis: | Atomic calculations, based on empirical potentials and the method of homogeneous deformation, are presented for the elastic properties of as-deposited amorphous carbon at 0 K. Several structural models of amorphous carbon generated by a realistic molecular-dynamics simulation of ion-beam deposition were studied. The models yield intrinsic compressive stresses of approximately 10 GPa. Here, we examine the dependence of the second-order elastic constants of amorphous carbon on the intrinsic stress, as well as on hydrostatic pressure. Different sets of elastic constants describing the behaviour of a solid under stress are considered. The non-linear effects are shown to become appreciable at a pressure of 10 GPa, whereas the difference between the elastic constants in the equations of motion and the Lagrangian elastic constants is not large. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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