-
-
March 9, 2023 at 10:57 am
Zoltan Wagner
SubscriberHi
For my project I am doing a simple crash box compression test/analysis where I need to compare my results from Ansys and the actual experiment. I am using PLA as my material which i had to create in ansys and these are the properties I have given:
In the experiment I am compressing the crash box by 3mm and measuring the Reaction force to find the energy absorbed by the structure. My problem is that the results I get from Ansys is very different compared to the tests.
This is the result from the experiment and the maximum froce is just belowe 12000N however this is what I get from ansys:
It is clear that the data I recieve from ansys is a lot higher than to the actual simulations but I cant figure out why.
If anyone could help me with what might be the problem it'll be appreciated.
Thanks
-
March 10, 2023 at 7:33 pm
Armin_A
SubscriberHi Zoltan,
Could you provide more details about your case?
For instance, what are the boundary conditions of the model and how do they compare to the actual experiment?
Did you observe any buckling in your experiment? Did the model resolve the same mode of deformation?
Did you assume your material to behave as linear elastic? -
March 12, 2023 at 12:03 pm
peteroznewman
SubscriberHi Zoltan,
It seems only linear elastic material properties were used. That would explain the huge forces computed in the simulation that are far above the experimental data.
The Tensile Strength properties in your material do not affect the simulation, they only support plotting Safety Factors results.
In Engineering Data, access the material models under the Plasticity category. The simplest one is Bilinear Isotropic Hardening. Put in the Yield Strength that you know, and use 0 for the Tangent Modulus. See how that changes the force in your simulation.
-
- 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.

Ansys Blog
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
- 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
- Defining rigid body and contact
- Colors and Mesh Display
- A solver pivot warning or error has been detected
-
8700
-
4658
-
3151
-
1672
-
1446
© 2023 Copyright ANSYS, Inc. All rights reserved.