June 7, 2018 at 2:20 pmjulsmoSubscriber
I relatively new to ansys and have trouble creating rotational springs. the explanations in ansys help didn't help much.
I attached my ansys code and the iges geometry to import. I am trying to create rotational springs at each intersection. Was aiming to do that with combin39 elements but get weird movements as the nodes can't be coincident for that and I'm not sure if I implemented the springs right anyway.
Goal would be to create stiffness with the springs to get some kind of s-shaped curves when I pull on the net in the y direction.
appreciate any help. thanks!
June 8, 2018 at 6:44 pmpeteroznewmanSubscriber
I recommend you use beams instead of links and rotational springs, since a beam is just an infinite number of links and springs.
If there is a reason to use links and rotational springs rather than beams, you can explain it further.
Attached is the Workbench ANSYS 18.2 version of your geometry from the IGES file above.
I don't use APDL much, but I did manage to see you wanted a 20 mm deformation in the y direction.
June 11, 2018 at 7:24 amjulsmoSubscriber
Hi thanks for answering!
There is indeed a reason I use links. It's for my thesis and there is a previous thesis where all elements were modelled as beams but that apparently didn't picture the behavior of the cable net correctly. So I want to simplify it further assuming in the simplest version a cable is just a tnsion only link and add torsinal springs to get stiffness perpenicular to the cable since it's only unidirctional cables...
June 15, 2018 at 9:27 amjulsmoSubscriber
Hi peter, just in case you see this. I am still working on the problem.. I have found a link element that works an dconnect it with spring elements, but can't couple the remaining dofs in a fixed way so both spring points move along the same distance. tried with a nonlinear mpc (rigid link).
attached is my skript and if you tell me how to attach an igs with my geometry, i can also do that
nx = 2 !Maschenanzahl horizontal !!!ANPASSEN!!!
ny = 2 !Maschenanzahl vertikal
maschx = 40 !Maschenbreite !!!ANPASSEN!!!
maschy = 2 !Maschenhöhe
vorspannx = 5
vorspanny = 8
keyopt,2,1,1 ! nichtlineare Berechnung
keyopt,2,2,6 !Feder rotz
June 15, 2018 at 11:36 ampeteroznewmanSubscriber
Unfortunately, I am a beginner with APDL.
I am highly skilled in Workbench and use an occasional Command object.
Someone else is going to have to help you with this.
June 15, 2018 at 12:37 pm
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