Keyword type: model definition
This option is used to define a gap geometry. The parameter
ELSET is required and defines the set of gap elements to which the geometry
definition applies. Right now, all gap elements must be of the GAPUNI type and
can be defined by an *ELEMENT card. The gap geometry is
defined by its clearance and direction
(a vector of
length 1). Let the
displacement vector of the first node of a GAPUNI element be
and
the displacement vector of the second node
. Then, the gap
condition is defined by:
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A *GAP card automatically triggers a geometrically nonlinear calculation, i.e. the NLGEOM parameter on the *STEP card is automatically triggered.
First line:
Second line :
Example: *GAP,ELSET=E1 0.5,0.,1.,0.
defines a clearance of 0.5 and the global y-axis as gap direction for all gap elements contained in element set E1.
Example files: gap.