Element-based surface 基于单元的表面[4]/学习整理

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Trimming the perimeter of an open surface
An “open” surface is one that has ends in two dimensions or an outside edge in three dimensions. The ends of a two-dimensional surface and the edge of a three-dimensional surface are called the surface's “perimeter.” Since Abaqus allows a surface to be defined as only a part of the surface of a body, it may have a perimeter even though it is defined on a closed body. Abaqus automatically performs surface “trimming” on solid element meshes. You can change the default setting when a surface is created, providing some basic control over the extent of surfaces.

Surface trimming:
is a recursive procedure that removes undesirable convex corners near the perimeter of an open surface (see the example below for details);
has no effect on closed surfaces (ones with no ends or edges);
is performed automatically, unless the surface is used as a master surface in a finite-sliding simulation in Abaqus/Standard or the surface is used with the contact pair algorithm in Abaqus/Explicit;
can be used only for external surfaces on solid element meshes (either specified surfaces or automatically generated free surfaces); and
has no effect on surfaces used with the contact pair algorithm in Abaqus/Explicit.

Input File Usage:
Use the following option to suppress automatic surface trimming:
*SURFACE, TYPE=ELEMENT, NAME=surface_name, TRIM=NO