September 10, 2020 at 4:41 pmEvandroSubscriber
Good Afternoon, I am trying to simulate a 3D model in ANSYS workbench. The model is a Tibia bone with a fracture and i am using 2 fixer e 12 screw. First, I got the mechanical properties of the bodies (screw, fixer and tibia).
Bone- Using a orthotropic materialSeptember 11, 2020 at 2:16 ampeteroznewmanSubscriberHello Evandro, welcome to the Forum!nI accessed your Google Drive Link. For future posts, please put one archive in the link because you have too many folders. I downloaded TCC2.wbpz from the wbpz folder. This is the correct way to share projects. Don't upload the files you put in the Analysis folder.nWhen I opened the archive, there are three analysis systems. Please limit the Project to one system. I opened system B, but there was only a bone in there. Delete that since there are no questions on that system. When I opened system C, it looks like what you wrote about above.nIn system C, Plac-Convc-SF, I see you have solved using ANSYS 18.1. I have access to ANSYS 2020 R1. Can you upgrade to that version?nI see that you have a 6-core computer, but you only solved on 2 cores. On ANSYS 18.1, you must click on the Solve Process Settings, and under the Advanced Tab, you can type in 6 for the number of Processors and instead of taking 15 minutes to solve, it might take less time. Also, check the box that says Distributed.nI see you have 55 automatically generated Bonded Contacts. I don't think it is accurate to use bonded contact between the head of the screw and the hole in the steel plate. It would be more accurate to use frictional contact. There are 12 screws. I think these 12 contacts between the head and the hole should be frictional.nContact 55 has bone bonded to the steel plate, is that accurate?nContact 54 has bone bonded to the steel plate, is that accurate?nContact 53 has bone bonded to the steel plate, is that accurate?nContact 21 has two screws bonded to each other, that is wrong.nYou might want to look into Bolt Pretension. That allows the screw heads to pull down toward the threads by having ANSYS automatically split the screw shank between the head and the threads and apply a pretension force in Step 1 of a 2-step analysis. Once all the screws are tightened, the loads are applied to the bone in Step 2.nSeptember 11, 2020 at 2:39 pmEvandroSubscriberThank you Mr Peter, first of all i have to apologize for the confusion that i made in the link and i change to Ansys 2020R1. In the archive you saw three analysis systems, actually the system A was the system in question. I will delete the system B, but the system C is a comparation that i will have to do with system A. However i will change everything you said about system C.nViewing 2 reply threads
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