Consider the case of a shell pinched between two rigid surfaces, as shown in
Figure 1.
In this example contact pairs using the small-sliding, node-to-surface
formulation are defined between the top surface of the shell and the top rigid
surface and between the bottom surface of the shell and the bottom rigid
surface. Although the shell surfaces are defined at the shell reference
location, the contact interactions account for the thickness of the shell and
are offset from the reference surface. The penalty constraint enforcement
method (see
Contact pressure-overclosure relationships)
is used to avoid overconstraining slave nodes. The following input is used:
SURFACE, NAME=TOP_RIG_SURF
TOP_RIG_ELS,
SURFACE, NAME=SHELL_TOP_SURF
SHELL_ELS,SPOS
SURFACE, NAME=SHELL_BOT_SURF
SHELL_ELS,SNEG
SURFACE, NAME=BOT_RIG_SURF
BOT_RIG_ELS,
CONTACT PAIR, INTERACTION=INTER_AL, SMALL SLIDING
SHELL_TOP_SURF, TOP_RIG_SURF
SHELL_BOT_SURF, BOT_RIG_SURF
SURFACE INTERACTION, NAME=INTER_AL
SURFACE BEHAVIOR, PENALTY