#### 2.3.3.1. Special Cases

Lay-ups in ACP are either stacked on the top or the bottom of a shell surface. If the shell offset direction of a Mechanical APDL model is not set to top or bottomthen the ply lying on the shell surface is split into two plies on either side of the shell surface during the conversion.

Figure : A Four Ply Mechanical APDL Lay-up Where a Ply Crosses the Reference Surface is Converted to a Five Ply ACP Lay-up

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