Large strain
Large strain
(OP)
Users, I need an advice!
I'm modeling a coronary stent with Ansys WB 9.0, this stent undergoes a radial strain and has plasticity, in this process, it has a contact with the arterial wall. I have built the solid model and I have apply all constraints. My problem is: why the stent undergo a rigid body motion in addition to the radial strain?
This problem doesn't appear if I impose a little radial strain (in this case, the stent has an enlargment and it contact with the arterial wall).
I can't constrain along z (the assial coordinate) my stent because Ansys can't rich a convergent solution... help me please!
Thanks
I'm modeling a coronary stent with Ansys WB 9.0, this stent undergoes a radial strain and has plasticity, in this process, it has a contact with the arterial wall. I have built the solid model and I have apply all constraints. My problem is: why the stent undergo a rigid body motion in addition to the radial strain?
This problem doesn't appear if I impose a little radial strain (in this case, the stent has an enlargment and it contact with the arterial wall).
I can't constrain along z (the assial coordinate) my stent because Ansys can't rich a convergent solution... help me please!
Thanks





RE: Large strain
Good luck,
-Brian
RE: Large strain
thanks for your advice, I'll try to introduce a frictional contact, I think it could solve my problem, even if the stent shows the rigid motion during the expansion and not when it reach the arterial wall.
Thank you
RE: Large strain
I don't know your geometry but I think you can add a spring or a link, with low Young modulus, in z direction, or add a bond, in z direction, upon the areas that limit your volume, for stabilize your body.
I don't know why the solution doesn't not converge but, if you put your constraints well, you can not have mistakes.
You can add the frictional contact but, if the problem is during the enlargment, I think the contact can't change your result.
Good luck
RE: Large strain
RE: Large strain
Thanks
RE: Large strain
RE: Large strain
I run WB in batch because for me is quite simple and I can modify parameters, if necessary, without restart from the beginning, I never work with the GUI.
For me, is impossible the documentation doesn't list any command for put a spring, probably I can run my model in GUI and after apply the spring and see, after, the command in the .log file.
RE: Large strain
RE: Large strain
RE: Large strain
also consider that you can insert APDL commands just like you would do with Ansys "classical". So, in order to apply weak springs, you can also create a COMBIN14 element type with RC,,... and so on. This works for every APDL command, except those which relate to graphical interaction in POST1.
Regards
RE: Large strain
RE: Large strain
sure you can! The spring/dampener 14 is a COMBINation element, it works with any other structural element type. But my suggestion wasn't to create the springs with APDL when you can use the Workbench option "Use weak Springs -> ON": it would be more difficult for nothing! It was only an example of how you can use APDL in order to "cheat" with operations that Workbench SEEMS not to be able to do (and, instead, he does...).
Regards