July 2, 2019 at 2:42 amPureInsanitySubscriber
I am trying to figure out how to resolve this error where:
Equivalent creep strain ratio has exceeded the specified limit value. Since the time increment has reached the minimum value, the analysis is stopped.
I have tried other ways to figure this out like change the equivalent ratio to 0 for each step but that led to convergence errors. Can anyone help? I am on a tight deadline.
EDIT: Guess I should have uploaded a pic, I am working on a thermo-mechanical buckling project of this plate with 0.1" thickness where the two ends are fixed and I applied a tabular-controlled temperature, while measuring the reaction force at one end. The error I am getting right now according to the Solver Output is "Error in Element Formulation."
July 12, 2019 at 7:42 pmSandeep MedikondaAnsys Employee
The typical suggestion is to try running the model without the creep first: since you are solving buckling that alone can pose element formulation errors. The creep strain limit option appears under Analysis Settings > Creep and that can be adjusted. But often, the issue is elsewhere and the default value should be just fine except for very specific cases.
July 12, 2019 at 8:21 pmSandeep MedikondaAnsys Employee
Also, one another suggestion you can try is to look at the magnitude of the elastic strain and try to assess what is an expected creep strain per increment (by hand). From there, you can arrive at a reasonable max allowable ratio (= creep strain/elastic strain).
July 13, 2019 at 1:51 pmPureInsanitySubscriber
I have tried both running without the creep and the max ratio. I do not have any error relating to the creep/strain ratio anymore, but I am still getting the "error in element formulation." It lead to a lot of sudden distortions as I am running the program, even according to the solver output.
One boundary condition I did not mention was the initial perturbation of 0.7 mm that lasts no longer than a second. In addition, the mesh I currently have is 0.5 inches. Do you think it has anything to do with the boundary conditions or the mesh?
July 15, 2019 at 9:50 pmBhargava SistaAnsys Employee
I'd suggest that you first get the model to run without using creep. Buckling can be challenging by itself if you're doing a nonlinear buckling analysis instead of linear eigenvalue analysis. Can you please provide more details about your model such as type of analysis (static or transient), loads and boundary conditions, an image of mesh density, and time-stepping (if applicable)? It'd be helpful in providing a better solution.
- 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.
- Saving & sharing of Working project files in .wbpz format
- Solver Pivot Warning in Beam Element Model
- 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
- whether have the difference between using contact and target bodies
- The solver engine was unable to converge on a solution for the nonlinear problem as constrained.
- User manual
- Colors and Mesh Display
- material damping and modal analysis
© 2023 Copyright ANSYS, Inc. All rights reserved.