So here I am currently trying to learn how to better master the GSA module of Catia. And there, when trying to simulate the constraints on one of my parts, I have the impression that there is a small problem of coherence. When my mesh is at 5 on the tube between the two plates I have a Von Mises constraint which is 40 MPa and when I change the mesh to 2 my constraint increases to 80 MP
I tried to find out where the problem came from but I can't do it. So I'm going to explain everything I did in the hope that you manage to find the problem.
So first of all I applied my constraints on my parts which are:
-A downward force of 62N
• A moment of 12 N.m X-axis
Next, I defined the bottom surface of the bottom plate as a flexible virtual piece that I then embedded .
I then put an analysis connection with line stopped and then I applied a solder bead connection property to it that I stiffened
And I did the same with the other end of the tube:
And that's it, after that I started my calculations
I'm not going to go into the details of the study but for me I don't see any inconsistency in having a constraint that increases when you refine the mesh, I even find it normal. That's the complexity of having a good balance between mesh, result and computation time.
I think you should read more about how to perform a calculation with this type of application (whether it's under Catia or SW), about the elements that can influence it and about the interpretation of the results.
I'm attaching a pdf that will allow you to understand the modules of Catia a little better.
You can find a lot of examples on the internet but it is important that you understand the basic concepts:
- The different types of mesh
- How to refine a mesh, why to do it and where to do it
- Understand the notion of global error
- The use of adaptivity
- Identify, understand, interpret the notion of singularity
- How to use a connector and bindings
I am aware that I am not providing you with a solution, but it seems important to me before embarking on calculations to understand these few notions listed (there are certainly some missing).
For me, without it, you could make any software say a little bit of anything!!
First of all, thank you for taking the time to answer.
In fact, it shocks me to see my constraint double when I refine my mesh, because while watching videos that explained the calculation of finite elements at one point, it was said that in order to know if our modeling was good at a certain time, by continuing to refine the mesh, we should see the results that stabilize. Whereas here it's quite the opposite. As I continued to refine it, I even came up with a constraint of 400 MPa. It's a far cry from my poor 20 MPa from the very beginning.
And thank you for the help documents.
Reading all the documents I say to myself that maybe it comes from a singularity? Because it's always in this precise place that I have my values going crazy:
I tried to fix it by putting a chamfer at the ends of my tubes to break the sharp edge but it's always the same.
