November 20, 2023 at 1:54 pmj.renaultSubscriber
According to LS-DYNA Material Manual, *MAT_058 can be fed with stress strain curves for tensile/compression and in-plane shear. Is there a way to include these curves directly in the engineering data in Workbench without the need of modifying the LS-DYNA input files generated by Mechanical/LS-DYNA to include it before analysis ?
November 22, 2023 at 11:49 pmReno GenestAnsys Employee
I don't think it is possible in engineering data. You can define *MAT_058 in engineering data:
But, if you define negative values for Ea, Eb, and Ec for example, Workbench will expect real values and will apply the units to it so that in the input.k file, -1 becomes -1E-6, -2 becomes -2E-6, and -3 becomes -3E-6. And so it does not work.
The best way to do this would be to use a command snippet in Mechanical and define the *MAT_058 card this way:
The negative value for Ea, Eb, and Ec correspond to a load curve for the stress vs strain. You can define the load curves (*DEFINE_CURVE) using a command snippet at the environment level:
Let me know if this helps or not.
November 23, 2023 at 11:27 amj.renaultSubscriber
First of all, many thanks for your answer. It helps for sure (also concerning the way to manage LS-DYNA Keywords snippets).
By the way, it seems to be not as important as expected at the beginning of the analyses we are working on. What I mean is that the inclusion of nonlinear behavior and the damage were not understood as it was supposed to be. We are going to work with constant value first for the different modules and then if needed we will add nonlinear module thanks to the definition of dedicated curves by applying the process you described in your answer.
Nevertheless, I hope that this kind of feature will be integrated in the next releases of Ansys (I mean at the "Engineering Data" level) as it allow us to lock and so on protect the material data in our models.
November 27, 2023 at 5:03 pmReno GenestAnsys Employee
I will file an enhancement request for this; it will help in the case where the composite layup is built with Ansys Composite PrePost (ACP).
Have a great day!
November 28, 2023 at 10:29 pmReno GenestAnsys Employee
I filed an enhancement request to add this feature. It won't be in the next release (2024R1) because this release is already frozen. But, it might be in the releases after depending on priorities.
Have a great day!
- 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.
- Explicit dynamics ERRORS
- turning simulation
- explicit dynamics
- getting zero maximum and minimum stress value in explicit analysis
- How to figure out impact force in Explicit Dynamic Analysis
- How do get Full values instead of just minimum and maximum ?
- Monte Carlo Simulation
- Running an explicit dynamics simulation on a composite plate
- Euler Domain Restricting Simulation
- Error inside ANSYS LS Dyna: “An error occurred inside the SOLVER module: general error.”
© 2023 Copyright ANSYS, Inc. All rights reserved.