This paper describes recent work by the authors on a continuum model for crystal twinning. Twinning is described as an anti-plane shear deformation with discontinuous strains, governed by an elastic potential with multiple wells. Possible shapes of twin lamellae and twinning steps and various regimes of their steady dynamic growth are studied. The model includes a kinetic relation governing anisotropic twin boundary motion in two dimensions under applied stress. [References: 16]
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