Learning Forum

[Aritra Chakraborty]

So I am failry new to ansys, and am comparing 2 simulations mimicking a 4 point beam bending simulation. The boundary condition looks like this:

Now in one case I have a single block in the center:


While in another case I add another 2 sections to create the following:

 

But for both cases the whole beam is one part and have the same material properties (that include plasticity and hardening models).

In the first case I am getting a smooth and correct solution:

While in the later case I am seeing a lot of oscillations in the force convergence and am getting very high stresses, which are wrong:

Both the simulations should be the same, however, I am seeing this discrepancy. Could you please help me figure out what is the reason for such ? I refined the mesh, but that did not help, and the mesh looks quite uniform in the geometry too.

Please help.

Best,

Aritra

 

[peteroznewman]

Are the blocks held together with bonded contact?

Open the geometry in SpaceClaim and on the Workbench tab click the Share button.

In Mechanical, delete all the Contacts out of the Connections folder. See if that gives better results.

[Aritra Chakraborty]

No there is no contact. Everything is a single part. I just created those 2 sections for a subsequent study which I want to do where they will have different material properties.

 

[Mike Rife]

Aritra

Triple check the boundary conditions on the second model.  

[Aritra Chakraborty]

Hi Mike,

I figured the issue. Actually I did not update properly the thermal condition such that all the blocks would be at the same temperature, rather there were a couple which were in different temperature and that created this issue. I completely missed this.

Anyway, the issue is resolved.

 

Thanks,

Aritra