Hello All,
so I had created ligament structures, and applied trans-iso mooney rivlin properties to them. My initial model was in meters, and when I applied the parameters in Pascals, the simulations did not run. However, when I entered the parameters in Megapascals, they ran just fine. So, I thought all I would need to do is to switch my model to millimeters. So I reconstructed my model in millimeters, brought everything back in to FEBio, and applied the trans-iso mooney rivlin properties to my model using MPa. When I run these simulations now, there seems to be some sort of negative poissons effect. I am applying a simple extension to the ligament structures. As I extend the structures, there is some sort of mid-substance bloating effect rather than hourglassing, which is what one would expect to happen.
I am thinking that there is some incorrect input that I am applying. Because when I use a iso-elastic material prop as a test, I am seeing the hourglassing. So maybe I am incorrectly applying the material fiber orientation or something like that? not sure
I have all the files, but I seem to have trouble uploading them. Any help debugging would be greatly appreciated.
Thanks,
-Alex
so I had created ligament structures, and applied trans-iso mooney rivlin properties to them. My initial model was in meters, and when I applied the parameters in Pascals, the simulations did not run. However, when I entered the parameters in Megapascals, they ran just fine. So, I thought all I would need to do is to switch my model to millimeters. So I reconstructed my model in millimeters, brought everything back in to FEBio, and applied the trans-iso mooney rivlin properties to my model using MPa. When I run these simulations now, there seems to be some sort of negative poissons effect. I am applying a simple extension to the ligament structures. As I extend the structures, there is some sort of mid-substance bloating effect rather than hourglassing, which is what one would expect to happen.
I am thinking that there is some incorrect input that I am applying. Because when I use a iso-elastic material prop as a test, I am seeing the hourglassing. So maybe I am incorrectly applying the material fiber orientation or something like that? not sure
I have all the files, but I seem to have trouble uploading them. Any help debugging would be greatly appreciated.
Thanks,
-Alex
Comment