Forming/Compaction analysis help

[mmmbordo643]

Hi all,

I have completed this first part of a forming analysis in abaqus explicit. In the first step a powder bed of 10mm is compacted to 3mm. the assembly consists of a die wall and top/bottom punches. Can anyone suggest how I can create a second step to determine the springback distance after the top punch is removed? I tried removing the contact condition but the resulting mesh is unrealistic and severely distorted.

Any ideas are greatly appreciated.

thanks,
Chris

 

[bassmanjax]

Hi Chris

I don't know if this applies in your case, but...

I do a lot of metal forming springback in Standard. I do the forming step in Explicit, and then *IMPORT the results into a Standard analysis with a single *STATIC step. There are no loads in the static step, just the boundary conditions needed to prevent rigid body motions.

Regards

Martin

 

[mmmbordo643]

Martin,

thanks for the reply. I am using the drucker-prager cap model for the material and i have read in the documentation that the import option may not be used for this model. Do you know anything about this? I have done the import and it completes successfully in standard, but there are no results. Any ideas?

thanks,
chris

 

[bassmanjax]

Hi Chris

No experience of using drucker-prager I'm afraid - purely metal bashing for me

It might sound lame, but have you got output requests in the springback step? Also, I usually use *IMPORT with update=yes and state=yes (default).

Other than that, I'm a bit stuck for answers....

Regards

Martin