Volume 27, 2021
|Number of page(s)||24|
|Published online||26 March 2021|
Discrete-to-continuum limits of planar disclinations
Institute of Mathematics for Industry, Kyushu University,
2 Faculty of Mathematics and Physics, Kanazawa University, Kanazawa, Ishikawa 920-1192, Japan.
* Corresponding author: firstname.lastname@example.org
Accepted: 2 March 2021
In materials science, wedge disclinations are defects caused by angular mismatches in the crystallographic lattice. To describe such disclinations, we introduce an atomistic model in planar domains. This model is given by a nearest-neighbor-type energy for the atomic bonds with an additional term to penalize change in volume. We enforce the appearance of disclinations by means of a special boundary condition. Our main result is the discrete-to-continuum limit of this energy as the lattice size tends to zero. Our proof relies on energy relaxation methods. The main mathematical novelty of our proof is a density theorem for the special boundary condition. In addition to our limit theorem, we construct examples of planar disclinations as solutions to numerical minimization of the model and show that classical results for wedge disclinations are recovered by our analysis.
Mathematics Subject Classification: 74E15 / 74Q05 / 49J45 / 35A15
Key words: Disclinations / discrete to continuum limits / non-linear elasticity / relaxation / Gamma-convergence
© EDP Sciences, SMAI 2021
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