November 18, 2023 at 10:05 pmGeorgios PanagiotopoulosSubscriber
I am trying to run an FEA for my Masters Project, where I am compressing a steel gasket (thin sheet of metal) between two diamonds. The compression of the gasket should create a sort of bulge of the metal as shown in the first figure. For some reason this bulge is not appearing in my simulation (second figure). Any ideas why?
November 20, 2023 at 2:04 pmArmin_ASubscriber
Please check the following items:
- Check the contact between the gasket and the diamond. From the picture, it appears that a small interference is present in the results.
- Reduce the mesh size, particularly for the gasket. Capturing the bulge may require a finer mesh.
- Make sure proper boundary conditions are applied to the gasket, specifically for the free end of the gasket that may influence the resulting deformation field.
November 20, 2023 at 4:13 pmGeorgios PanagiotopoulosSubscriber
Thank you very much for your advice!
I have refined the mesh and fixed the contact so that the intereference no longer occurs, but the bulge is still not showing. My only boundary conditions are displacement at the top of the top diamond and a fixed support at the bottom of the bottom diamond. Do you think they need to be adjusted?
November 20, 2023 at 4:41 pmArmin_ASubscriber
No problem Georgios.
Are you sure that the bulge forms in an actual situation? The picture that you provided seems like a schematic rather than an actual experiment. But if the bulge is expected to form, you may adjust the friction coefficient between the diamond and the gasket (while keep using a fine mesh), as well as adjusting the boundary conditions at the free end of the gasket that may be switched to a fixed support, for example.
Also, if you're using metal plasticity, you may check how the associated plasticity parameters can influence the results.
November 20, 2023 at 10:58 pmGeorgios PanagiotopoulosSubscriber
Yes, the bulge also occurs in experiments. I tested out many different friction coefficients, but that also did not solve the problem. I tried different boundary conditions and none of them resulted in a bulge, just the gasket tilting upwards. How can the plasticity parameters be changed? I am using the default stainless steel for the gasket. Thanks again!
November 21, 2023 at 3:01 pmArmin_ASubscriber
For more information about plasticity models, you can check the free course below in Ansys Innovation Space:
Topics in Metal Plasticity | Ansys Innovation Courses
November 22, 2023 at 4:34 pmGeorgios PanagiotopoulosSubscriber
November 22, 2023 at 5:09 pmArmin_ASubscriber
The stress distribution looks file to me. Around the fillets is where we typically see larger stresses. I suppose you used plasticity in the gasket.
By the way, you can specify the diamonds to behave like a "rigid" material since they are much stiffer than the gasket and I assume stresses in the diamonds are not of importance. This will significantly reduce the run-time of the model. Just a suggestion.
- 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.
- Errors about integrate executable into ANSYS Workbench using ACT
- How many designs are generated while performing optimization using Optislang with NLPQL?
- ANSYS Optislang
- Optislang workbench add-in
- Design of Experiment points: Design Exploration
- Local Sensitivity and Sensitivities: what difference?
- Parameter relationships for Optimization
- Parametric study: Batch mode
- Optislang Adaptive Metamodel of Optimal Prognosis(AMOP)
- DesignXplorer vs optiSLang for Workbench CFD Optimization
© 2023 Copyright ANSYS, Inc. All rights reserved.