Description: Defines a general element.
Format:
UIm - The last item in the UI list will appear in one of fields 2, 4, 6, or 8.
UDn - The last item in the UD list will appear in one of fields 2, 4, 6, or 8.
KZmm - The last item in the K or Z matrix will appear in one of the fields 2 through 9.
Smn - The last item in the S matrix will appear in one of fields 2 through 9.
Example:
Field | Definition | Type | Default |
---|---|---|---|
EID | Element identification number. | Integer > 0 | Required |
Uli, Cli UDj, CDj | Identification numbers of coordinates in the UI or UD list, in sequence corresponding to the
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Integer ≥ 0 | |
KZij | Values of the
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Real | Required |
Sij | Values of the
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Real | See Remark 1 |
UD, K, Z, and S | Character variables that indicate the start of data belonging to the UD list or the
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Character |
Remarks:
The flexibility approach:
where,
and
The required input is the
list and the lower triangular portion of
or
. Additional input may include the
list and
. If
is input,
must also be input. If
is input but
is omitted,
is internally calculated. In this case,
must contain six and only six degrees of freedom.
The forms shown above for both the stiffness and flexibility approaches assume that the element is a free body with rigid body motions that are defined by
.
where i-j means the j-th component of grid point i. Points 42 and 33 are scalar points.