The general contact domain for modeling contact interactions in Abaqus/Standard has double-sided facets. Initial contact adjustments for resolving gaps and  overclosures when a surface with double-sided facets is paired with any surface having double-sided facets may be incorrect. Similarly, adjustments for double-sided surfaces crossing each other may be incorrect and no additional warnings or error messages will be issued. In all these cases, we recommend using single-sided surfaces under *CONTACT INITIALIZATION ASSIGNMENT to  handle initial adjustments more precisely and avoid  possible convergence problems.

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