Abstract
In this paper, we propose a methodology that allows disentangling the interaction of two Stone-Wales defects in a two-dimensional model material, which has the crystalline structure of a honeycomb lattice. The nonaffinity of the material response is represented as a linear superposition of nonaffine displacements caused by every individual defect and a residual nonaffine displacement field. The latter is then identified as the interaction field linked to a weakening or---as also shown---strengthening effect. We perform various numerical deformation tests in the athermal quasistatic limit on selected configurations. In doing so, we introduce a field variable to validate the contribution of the defect interaction field that indicates the mode of material failure, which also explains why some configurations with two Stone-Wales defects have a higher tensile strength than other configurations with only one defect.
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