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Contributor
piepCAE
Posts: 23
Registered: ‎05-14-2009

Core Shift Analysis - Core contact detection

1064 Views, 2 Replies
08-04-2011 03:19 AM

Hello,

 

Does Modflow detect contact between cores when performing a Core Shift analysis using multiple cores?

Please see attachment.

I'm performing an analysis using metal inserts and I want to calculate the insert displacement during filling. In this specific analysis one large metal insert is fixed in both ends and then there are small inserts that prevent the displacement of the large insert in a certain direction. What seems to be the problem is that when the large insert stars to deform it penetrates the small inserts!!! The workaround is to constraint the nodes directly on the large insert and to forget about the small ones, but I'd prefer to model the full assemble for realism purposes. Is this possible? Thanks in advance for your support.

 

Best regards,

Carlos

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Valued Contributor
PascalGosset
Posts: 71
Registered: ‎06-18-2010

Re: Core Shift Analysis - Core contact detection

08-29-2011 07:23 AM in reply to: piepCAE

No, it doesn't.

So you must simulate the small cores setting constrains where they occur.

 

Take care about the results. The core shift analysis is not terrific.

See the exemple joined.

I voluntarily off-center the core. The thicker wall of the part is filled first.

The pressure deforms the core until it is in contact with the mold (at 1.34 s).

1st trouble : the core deplacement is 1.56 mm, although the wall thickness is 1.5 mm.

2nd trouble : the filling of the thinner wall continues ! ! !

"Maybe Moldflow does not work properly, but the real world neither."
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Contributor
piepCAE
Posts: 23
Registered: ‎05-14-2009

Re: Core Shift Analysis - Core contact detection

08-30-2011 08:01 AM in reply to: PascalGosset

Thanks for your answer.

 

In fact that's what I did, I constrained the nodes of the large insert that would be in contact with the small ones if they where there. Anyway, I still find that as work around the problem, but I believe Autodesk is addressing it already.

 

I'm aware that the core shift analysis isn't terrific, but thanks for the recall!

 

Regards,

Carlos

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