ELBOW
ELBOW, Transkey, TOL, Dof, Cons1, Cons2, Cons3, Cons4
Specifies degrees of freedom to be coupled for end release
and applies section constraints to elbow elements.
TranskeyPipe-to-elbow transition flag:
OFF
—
Do not automatically transition pipes to elbows. (This behavior is the default.)
ON
—
Automatically convert straight PIPE289 elements to ELBOW290 elements where it is beneficial. The program converts elements in transition regions where curved ELBOW290 elements are connected to straight PIPE289 elements.
TOLAngle tolerance (in degrees) between adjacent ELBOW290 elements. The default value is 20. A value of -1 specifies all selected ELBOW290 elements.
DofDegrees of freedom to couple:
ALL
—
Couple all nodal degrees of freedom (UX, UY, UZ, ROTX, ROTY, and ROTZ). This behavior is the default.
BALL
—
Create ball joints (equivalent to releasing ROTX, ROTY, and ROTZ).
Cons1,Cons2,Cons3,Cons4Section degrees of freedoms to constrain. If
Cons1throughCons4are unspecified, no section constraints are applied:SECT
—
All section deformation
SE
—
Section radial expansion
SO
—
Section ovalization
SW
—
Section warping
SRA
—
Local shell normal rotation about cylindrical axis t2
SRT
—
Local shell normal rotation about cylindrical axis t1
Notes
The ELBOW command specifies end releases and section constraints for ELBOW290 elements and converts straight PIPE289 elements to ELBOW290 elements.
Curved PIPE289 elements are not converted to ELBOW290 elements.
ELBOW290 elements are generated only if there are existing ELBOW290 elements in the curved areas.
The command works on currently selected nodes and elements.
It creates end releases on any two connected elbow elements whose
angle at connection exceeds the specified tolerance. From within the
GUI, the Picked node option generates an end
release and section constraints at the selected node regardless of
the angle of connection (that is, the angle tolerance [TOL ] is set to -1).
Elbow and pipe elements must share the same section ID in order for the pipe-to-elbow transition to occur.
To list the elements altered by the ELBOW command, issue an ELIST command.
To list the coupled sets generated by the ELBOW command, issue a CPLIST command.
To list the section constraints generated by the ELBOW command, issue a DLIST command.