October 4, 2017 at 12:20 pmpglAnsys Employee
How does force frictional sliding contact behave in Rigid Body Dynamics (RBD)?
October 11, 2017 at 8:59 pmpglAnsys Employee
Force Frictional Sliding contact is not designed to model sticking situation.It works well for sliding contact where the friction leads to a resisting force (opposed to the sliding velocity) which is directly proportional to the normal contact force Ft=muFn.
In order to avoid integration difficulty with low sliding velocities (basically when the contact would ideally be sticking or close to sticking), the friction factor varies linearly between 0 and its nominal values if the sliding velocity is lower than a given velocity.
In summary, If ||v||>=v_tol, Ft=muFn If ||v||
tol, Ft=mu*(||v||/vtol)*Fn This velocity tolerance is internally computed from the contact radius among many other parameters.
Unfortunately, this tolerance cannot be get or set by the user. However, there is a command that affects its computation. options=CS_SolverOptions() options.VelocityToleranceFactor=1.0 The default value is 100. It allows to improve the behavior to be "closer" to a sticking contact but it won't ever be perfectly sticking.
With a factor=1 (a lower velocity tolerance), it will be possible to have lower sliding velocities, like an "almost sticking" contact status.
- You must be logged in to reply to this topic.
Boost Ansys Fluent Simulations with AWS
Computational Fluid Dynamics (CFD) helps engineers design products in which the flow of fluid components is a significant challenge. These different use cases often require large complex models to solve on a traditional workstation. Click here to join this event to learn how to leverage Ansys Fluids on the cloud, thanks to Ansys Gateway powered by AWS.
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.
- Solver Pivot Warning in Beam Element Model
- Saving & sharing of Working project files in .wbpz format
- Understanding Force Convergence Solution Output
- An Unknown error occurred during solution. Check the Solver Output…..
- What is the difference between bonded contact region and fixed joint
- User manual
- The solver engine was unable to converge on a solution for the nonlinear problem as constrained.
- whether have the difference between using contact and target bodies
- material damping and modal analysis
- Colors and Mesh Display
© 2023 Copyright ANSYS, Inc. All rights reserved.