August 2, 2019 at 6:58 amTallaSubscriber
I have a question regarding the contact type in ansys. For example for a model of two blocks tighten by for bolts( A bolt in each corner). So normally I can’t have a sliding between the two blocks. When I do some research in the internet many people use a frictional contact between the two blocks to model this situation but when I try it I get a sliding between them. I were thinking that when I use a pretention bolt + a frictional contact normally the pretention load will create a limited zone between the two block (clamping cone) in which the two blocks will be bonded and so avoid the gliding. I notice that when I use the rough contact I have no more gliding between them. I think that this is due to the fact that the rough contact is with an infinite frictional coefficient.
Any explanations will be really appreciate
August 2, 2019 at 7:35 amjj77Subscriber
If you can upload your model then someone might be able to have a closer look. Go to file/archive in WB and save it as a .wbpz, and then use the attach button next to your post above to attach it here
August 2, 2019 at 8:04 amTallaSubscriber
Hi jj77, thank you for your response i can't share my real model because its confidential but this is a quick model with the same problem. you will see that because of the sliding there is non continuty in the displacement between the two blocks. thank you for you help
August 2, 2019 at 8:12 amjj77Subscriber
I saw that you are doing a pre-stressed modal analysis so you need to have in mind that modal is linear and contacts are nonlinear. Thus contacts are linearised.
Also the perturb command shows how contacts are treated - search for that in help or google (PERTURB and ansys)
The sticking option valid for frictional contacts generates a frictional tangential contact stiffness at the interface thus the closed contact can not slide that much depending on the tangential contact stiffness.
For more info on this see:
As for your set up and the behaviour it seems realistic and behaves normal, and as one would expect. Also leave the contacts to default if you are not sure 100% what you are doing. Say bonded could be more ok with MPC not with penalty.
August 5, 2019 at 6:23 amTallaSubscriber
thank you jj77 and sorry for the late response i were out of th office. i will take a look into the link that you sent and let you know after
August 5, 2019 at 9:35 amTallaSubscriber
Helllo jj77 can you explain how to use this command please
August 5, 2019 at 9:40 amjj77Subscriber
To set it to sticking in WB go to the the initial conditions/pre-stress effect in the modal analysis and at the bottom there is something about contact treatment - change it to sticking
August 5, 2019 at 10:09 amTallaSubscriber
thank you jj77, thats works if I force the contact status to sticking. But i am still wondering something, actually i must have a sticking part just inside the clamping cone and if I force contact to sticking all surface will have the sticking status
August 5, 2019 at 10:37 amjj77Subscriber
read through the documentation on that part as I said:
- You must be logged in to reply to this topic.
Earth Rescue – An Ansys Online Series
The climate crisis is here. But so is the human ingenuity to fight it. Earth Rescue reveals what visionary companies are doing today to engineer radical new ideas in the fight against climate change. Click here to watch the first episode.
Subscribe to the Ansys Blog to get great new content about the power of simulation delivered right to your email on a weekly basis. With content from Ansys experts, partners and customers you will learn about product development advances, thought leadership and trends and tips to better use Ansys tools. Sign up here.
- Saving & sharing of Working project files in .wbpz format
- Understanding Force Convergence Solution Output
- An Unknown error occurred during solution. Check the Solver Output…..
- Solver Pivot Warning in Beam Element Model
- Colors and Mesh Display
- whether have the difference between using contact and target bodies
- How to calculate the residual stress on a coating by Vickers indentation?
- What is the difference between bonded contact region and fixed joint
- The solver engine was unable to converge on a solution for the nonlinear problem as constrained.
- User manual
© 2023 Copyright ANSYS, Inc. All rights reserved.