How to obtain the center of mass after large deformation

[simon291]

Hi all,

Can I get the center of mass after large deformation automatically by ABAQUS?

Further, I want to track the the movement of center of mass during the deforming process. Is it possible to output the center of mass step by step? Thank you!

Simon

 

[akabarten]

Hi,

If you are using Abaqus/Explicit you can use integrated output COORDCOM for specific element set.

For details see Abaqus documentation:
- Abaqus Analysis User's Manual, 4.1.3 Output to the output database, Integrated output in Abaqus/Explicit
- Abaqus Analysis User's Manual, 4.2.2 Abaqus/Explicit output variable identifiers, Integrated variables

Regards,
Bartosz

 

[simon291]

Sorry I did not explain clearly.

The center of mass in my case is not on the structure. For example, a hollow structure. The structure I studied is having large deformation. So the center of mass is moving during the loading process. I want to track the movement of the center of mass and this point is not on the structure.

Thanks a lot.

Simon

 

[akabarten]

Hi

The structure I studied is having large deformation

So as I understand it is mesh with finite elements.
It means you already have elset with all elements which belong for the structure or you can create such.

When you ask for COORDCOM output abaqus will calculate centre of mass for those elements base on nodes position due to deformation.
At the end you will get plot how coordinates of center of mass changes during time/deformation.

Am I missing something ?

Regards,
Bartosz

 

[simon291]

Thanks for your kind reply. You are right about my question.

I notice that COORDCOM is only for ABAQUS/EXPLICIT. Is there anyway I can do this in ABAQUS/STANDARD?

Thanks again.

Simon

 

[simon291]

Specially for the Static General analysis. Thank you!

 

[akabarten]

Hi,

For Abaqus/Standard you can try XC output. Please check:
- Abaqus Analysis User's Manual, 4.2.1 Abaqus/Standard output variable identifiers, Whole and partial model variables

Regards,
Bartosz