At least one body has been found to have only 1 element in at least 2 directions

[kubatycjan]

Hello all,

I am trying to do the ANSYS static structural simulation on my assembly component; self-made car jack.

Beetween elements of my tool I used in contacts Bonded. What's more Ansys seems to see the connections beetween components even though I indicated them.        I have used mesh size = 5mm and mesh numbering to reduce number of nodes.

During an analysis this warning showed up: At least one body has been found to have only 1 element in at least 2 directions along with reduced integration.  This situation can lead to invalid results or solver pivot errors.  Consider changing to full integration element control or meshing with more elements.  Offending bodies can be identified by Right-clicking in the Geometry window and choose Go To -> Bodies With One Element Through the Thickness.  Refer to Troubleshooting in the Help System for more details.
Error: An unknown error occurred during solution.  Check the Solver Output on the Solution Information object for possible causes.

Does anybody know solve this problem ? Cause I don't have any idea how to find this Go To -> Bodies With One Element Through the Thickness. Or maybe the elements of the car jack are to big and I need to minimize them. 

 

[Erik Kostson]

 

Hi

This post shows how to see/get which body it is reporting in the warning/error msg.

https://innovationspace.ansys.com/forum/forums/topic/harmonic-acoustic-analysis-2/

Alsos one can just follow the advice:

Offending bodies can be identified by Right-clicking (on your mouse) in the Geometry window and choose Go To -> Bodies With One Element Through the Thickness

All the best

Erik

 

[kubatycjan]

Hello, thank you for your advice but I don't that kind of option in Workbench. Offending bodies can be identified by Right-clicking (on your mouse) in the Geometry window and choose Go To -> Bodies With One Element Through the Thickness

[Deepak]

Hi,

Right-click on the open space of the GUI window.

Thanks

Deepak

[Erik Kostson]

 

Click on the Geometry Window not the Geometry Tree (Geometry Window is where the mesh and results say are shown)

 

[kubatycjan]

Alright, I think , I found the source of my problem. Then what is suppose to with those arms ? Should I change size elements in mesh or their geometry ? 

 

[Deepak]

Change the element size for those geometries, by using the sizing tool in the mesh.

[kubatycjan]

Thank you, by the way do You know how to change full integration element control ?

[Deepak]

You can find a video on YouTube with the title "Enable Full Integration Element Control in Ansys Mechanical", which shows how to change the element control.

[kubatycjan]

I did change size elements of all arms to 25 mm and the rest of the body to 20 mm. I did change in Geometry Element Control to Manual. However this error showed up: An unknown error occurred during solution.Check the Solver Output on the Solution Information object for possible causes.

 

 

[Deepak]

I didn't find any error message in those snips, can u please find the "ERROR" word in the file and share that message?

Can you please try with the default mesh size, and what was the arm thickness? 

Please verify that all the bodies are constrained properly.

[kubatycjan]

The arm thickness is 3mm . Which element size should I change to default ? Arms or the rest of the parts ?

It is showed in contacts bonded - no selection to no selection, even though I chose their contact and target bodies.

 

 

 

[Deepak]

Set the element size of the arms to 1.2mm, and Rest all to default.

For the contacts, select all contacts and right click > select "Renaming Results Based on Definition"

[kubatycjan]

 

[Deepak]

Are you able to solve it? The above snips show a "0" Error.

[kubatycjan]

No, I can't. The analysis was finished in the bar below it was showed 99%, but then the error suddenly emerge

By the way can you please how to verify that all the bodies are constrained properly ?

[Deepak]

Check by inserting the contact tool, in the model. The initial contact status should be closed.

I tried it out on a simple model it working fine.

 

[kubatycjan]

With those gaps I woudn't be able to make this analysis. Do You know how to minimize them ?

 

[Deepak]

Please check the contacts that are in orange legend, and pre-clean the geometry without penetration. Please share the snip of one of those contacts.

 

[kubatycjan]

"Share the snip of those contacts" ? You mean by changing their contact bodies ? Instead of holes in the arms and side basses , choose their faces or edges where they have contact ?

 

[Deepak]

No, the contacts that are in orange in "initial information of contact tool", share those contact images. I was trying to see for which contact pair it is giving the penetration.

[kubatycjan]

 

[Deepak]

Help check the clearance and any interference in the design of sidebase1 and sidebase2.

[kubatycjan]

There is an interference in my model particurly beetween rail and upper bases. No clearance where found.

[kubatycjan]

Is there any posibility to send you this file so You can check on it ?

[Deepak]

Sorry, sharing the file in the forum is not allowed. You can try to running the simulation by suppressing the screw part.

 

[kubatycjan]

Thank You, but I need this rail in Engineering Thesis. If my upper basis are the source of the problem the best option would be toa check out Model in Spaceclaim and  again assemble them with arms ? Or do You have other idea ?

Best Regards

[Deepak]

Yes, that was a good option to clean up geometry in spaceclaim and assembly the parts properly.

[Deepak]

You can also try defining the revolute joints b/w arms.

[Deepak]

Hi,
Please look into this forum discussion solver-pivot-error-1-element-in-at-least-2-directions-error

Thanks,
Deepak