Discrete-to-continuum limits of planar disclinations

Cesana, Pierluigi; Meurs, Patrick

doi:10.1051/cocv/2021025

Cited by 2 publications

(1 citation statement)

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“…The contributions [43] and [92] propose a mesoscale theory for crystal plasticity designed for modeling the dynamic interplay of disclinations and dislocations based on linearized kinematics and written in terms of elastic and plastic curvature tensors. Variational analysis of a discrete model for planar disclinations is performed in [24]. Finally, we point out that the papers [2] and also [98,99] consider a differential geometry approach for large non-linear deformations.…”

Section: Introductionmentioning

confidence: 99%

Semi-discrete modeling of systems of wedge disclinations and edge dislocations via the Airy stress function method

Cesana¹,

Luca²,

Morandotti³

2022

Preprint

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We present a variational theory for lattice defects of rotational and translational type. We focus on finite systems of planar wedge disclinations, disclination dipoles, and edge dislocations, which we model as the solutions to minimum problems for isotropic elastic energies under the constraint of kinematic incompatibility. Operating under the assumption of planar linearized kinematics, we formulate the mechanical equilibrium problem in terms of the Airy stress function, for which we introduce a rigorous analytical formulation in the context of incompatible elasticity. Our main result entails the analysis of the energetic equivalence of systems of disclination dipoles and edge dislocations in the asymptotics of their singular limit regimes. By adopting the regularization approach via core radius, we show that, as the core radius vanishes, the asymptotic energy expansion for disclination dipoles coincides with the energy of finite systems of edge dislocations. This proves that Eshelby's kinematic characterization of an edge dislocation in terms of a disclination dipole is exact also from the energetic standpoint.

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