ANSYS Connection Worksheet-Mech_AC_160_WS1b-Connections

Workshop 1B
Connection Worksheet
16.0 Release
ANSYS Mechanical
Advanced Connections
Workshop 1B: Connection Worksheet
Goal
Use Connection Worksheet together with Redundancy Analysis tool to evaluate and resolve an over constrained condition
Model Description
Same model as Workshop 1A
Assembly of 12 parts with many contacts
and joints, one longitudinal spring and
one beam element.
Materials:
•Linear structural steel
Assuming you completed WS1A successfully, you should have ended with a converged solution and with various warning messages about potential over constraint in the message window:
Note that these messages are not necessarily a problem, if solution is converged and results shown to be valid.
Nevertheless it is always worthy of an investigation.
With Connections Folder highlighted, click on “Worksheet” button in the Utility Menu With all options checked, click “Generate”
From the Contact Information Table, all of the contact regions are Bonded, Face-to-Face, with program controlled default specifications as expected.
Scroll down further to find feedback on the existing joints, spring and beam connections. Note especially the recommendation to run the Redundancy Analysis to detect redundant joint constraints.
…Workshop 1B: Connection Worksheet
Scroll down to the Connection Matrix. Note there are multiple connections involving parts 1,4,5 and 11
…Workshop 1B: Connection Worksheet
With Connections Folder still highlighted, RMB => Redundancy Analysis
This brings up a table below the graphics window that lists all the constrained DOFs associated with the Joints.
Click on the yellow lightning bolt to run the Redundancy Analysis
…Workshop 1B: Connection Worksheet The Table is now updated to list those DOFs which are redundant
Click on the Convert.. button to release redundant constraints
…Workshop 1B: Connection Worksheet
Clicking on the “Set” button will apply these changes to the actual joint definitions in the model Verify the changes made by examining the expanded Joint Folder, compare with the original settings.
With these changes made, re-solve the model.
Solution converges as before, but without the warnings of possible overconstraint:
Post Process Results: Compared with results from end of WS1A, the joints that have been suppressed as part of the redundancy analysis were not necessary.。