Nonlocal linear instability via vanishing Hessian eigenvalue initiates twin boundary motion in a 2D lattice model, with irrational boundaries starting at lower shear stresses and sometimes forming orthogonal microtwins.
While strictly irrational twin planes would require an infinite periodicity in the horizontal direction, we use a large but finite periodicity to mimic this
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Nonlocal Linear Instability Drives the Initiation of Motion of Rational and Irrational Twin Interfaces
Nonlocal linear instability via vanishing Hessian eigenvalue initiates twin boundary motion in a 2D lattice model, with irrational boundaries starting at lower shear stresses and sometimes forming orthogonal microtwins.