Element-based surface 基于单元的表面[3]/学习整理

wrj001

Defining single-sided surfaces
You can define a single-sided surface on the positive or negative face of structural, surface, or rigid elements. The positive face is defined as the one in the direction of the positive element normal, and the negative face is defined as the one in the direction opposite to the element normal.
You must ensure that all of the specified elements have their normals oriented consistently.
Further, an error message will be issued and the analysis will terminate if this condition is detected for surfaces used with mesh tie constraints in Abaqus/Standard or with contact pairs. To correct the surface orientations in this figure, two separate element sets with different face identifiers should be used.
[要更正此方向，也可以在Hypermesh里调整normal。Tool->normals]
Input File Usage:                  
Use the following option to define a surface on the positive face of a structural, surface, or rigid element:
*SURFACE, NAME=surface_name, TYPE=ELEMENT
element number or element set, SPOS

Use the following option to define a surface on the negative face of a structural, surface, or rigid element:
*SURFACE, NAME=surface_name, TYPE=ELEMENT
element number or element set, SNEG

For example, single-sided surfaces on the positive faces of the elements in element set SHELL can be defined using input similar to
*SURFACE, NAME=BSURF, TYPE=ELEMENT
SHELL, SPOS