May 6, 2022 at 6:22 pmA2148Subscriber
I'm simulating the creep analysis using a modified time hardening model. I have found all the material constants through ANSYS APDL curve fitting. Moreover, I am taking 2-time steps. In the first time step, I'm using 500 initial subsets and a minimum of 10. In the second time step, I'm using 1000 initial subsets with a minimum of 20.
Here, the problem is that the analysis is running only at the end of the 1st time step. It shows the error at the beginning of the 2nd time step with creep and large deflection effects on.
About contact, I'm using frictionless contact. Furthermore, I also tried newton raphson to review the unbalanced force. I have used the finner mesh to mitigate the unbalanced force but have not gotten results.
Anyone give me recommendations that will be appreciated...ThanksMay 6, 2022 at 6:34 pmMay 6, 2022 at 9:56 pmpeteroznewmanSubscriberUnder Analysis Settings, for Current Step Number 2, set the Initial Substeps to 10000 and Minimum Substeps to 1000 and see if that helps.
May 11, 2022 at 12:45 amA2148SubscriberHi, thank you for the reply. I'll apply those conditions and check the results. if there will be any problem I'll get back to you sooner. Much appreciated
May 11, 2022 at 3:49 amMike RifeAnsys EmployeeYou should be able to take the creep law used along with the stress, temperature, and time increment and hand calculate the expected creep strain (or strain rate for most creep laws). It's a good sanity check. Also remember that once fitted the creep law constants cannot change their unit system so make sure they are entered in WB Engineering Data in the same system of the data you used during the curve fit, and WB Mechanical is set to the same unit system. It's pretty easy to blow up a creep law term to some non-a-number with the wrong units (been there, done that plenty!).
Post process the non-converged results - that may tell you something as well.
Viewing 4 reply threads
Ansys Innovation Space
- The topic ‘Facing problem in creep analysis (convergence issue)’ is closed to new replies.
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.Trending discussions
- How to do the frequency response of the nonlinear vibration of a flexible PCB?
- Importing Line and Solid Bodies from SpaceClaim to Mechanical
- how to open SendCommand in Ansys
- problems facing during solution
- Still facing the same issue
- Failed to move file from solver directory to scratch directory: file.rst
- Adaptive Sizing
- Stiffness factor
- Import DAT file
- Import pressure data (coordinates and value) to ansys workbench through excel
Top Rated Tags
© 2023 Copyright ANSYS, Inc. All rights reserved.Ansys does not support the usage of unauthorized Ansys software. Please visit www.ansys.com to obtain an official distribution.