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When the crack is represented as an internal boundary, select Slit. This will cause the displacements of the two sides of the boundary to be decoupled from each other so that a crack is formed.
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If only half of a symmetric structure is modeled, so that the crack is an external boundary, select Symmetric. In 2D axisymmetry, this is only meaningful for cracks that are perpendicular to the axis of rotation. There are two cases:
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The crack is infinitely thin and located in the symmetry plane. Other boundary conditions like Fixed Constraint or Symmetry will be overridden on the crack surface, so that the crack can be opened.
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