Learning Forum

[Ffatihkaraoglu]

Hello everyone, I am a new and amateur ANSYS user. I am trying to analyze the effect of a blood vessel on a stent.

1. I assigned the material properties of the vessel to the vessel. For the stent, as seen in the table, I assigned five different materials sequentially.
2. I chose the bond type between the vessel and the stent as bonded.
3. The mesh settings are as shown in the visual.
4. I constrained both ends of the vessel and applied a pressure of 1200 mmHg to its inner surface.

When I ran the simulation, the material with the lowest safety factor among the five materials turned out to be Nitinol. It seems very incorrect to me that Nitinol would have such a low value. I used the materials from ANSYS's own library and did not make any modifications. What do you think the issue might be here?

[mohan.urs]

Hey,
Safety factor is just a simple calculation of yield/equivalent stress obtained at that point (assuming you used equivalent stress theory). So, if you feel saftey factor factor is too less for the Nitinol. I would suggest you double check the material properties. There are various alloys of nitinol and the one which you might have it in mind might differ from the one inside ansys. Manually input the Nitinol properties in engineering data and assign it to the model. Also the mesh on the tube feels too coarse, so refine it a little more (2 elements through thickness atleast).

Regards,
Mohan Urs