I conducted pipe stress analysis using CAESAR II. And now I am trying to create similar analysis but in this case I use ANSYS APDL.
I find a problem while creating the boundary conditions, where in ANSYS APDL I can't model the Y+ supports because ANSYS APDL only has an option to restraint movement in both Y- and Y+ direction (the UY option, as can be seen in Figure 2).
Can anyone help me to model the Y+ support in ANSYS APDL?
I'd like to appreciate any responses.
Pipe stress analysis is generally linear, so, in this case, UY is always bilateral, however one could apply either positive, or negative prescribed displacement that will remain the same throughout the analysis.
To achieve +/- displacement only, a contact element needs to be introduced, that will makes the analysis nonlinear.
Alexander Pinsker thanks for the comment. So in this case I need to create a new part by using another element such as TARGE 170, then I create the contact with CONTA 175 for instance. Am I right?
@muhamad you can do that, or, you could try link180 since your pipe model is line model. But the nonlinear model nature introduced by the nocould complicate the analysis.
Muhamad Alim sorry. The answer above should read “… nonlinear model nature introduced by the contact element could …
Muhamad Alim basically, ANSYS manual and general notion related to nonlinear contact analysis prone to abrupt state changes, like from tension to slack. So, you may want to try prestressed stage first , so the link is taut and give it some compression properties, so the convergence is assured. it’s a trial and error. If it’s a dynamic analysis, Damping introduction should help.
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