Change TIE to other connection
Hi!
I have problem with TIE connection. I imported and converted model from Abaqus with TIE connections to Optistruct. My model is ready to solve, but I discovered that TIE connection need huge memory space (Core IN: 350GB, Core OUT 800GB /emoticons/default_blink.png' title=':blink:' /> , without TIE Core IN 40GB). Has anyone any idea how to replace TIE connection to other? I thing the best element for 'TIE' should be RBE2.
Ps. My TIE connection contain 'contact surfaces' and 'groups' (Card image: TIE).
Ps2. I know that the simplest way is to create 'spotweld' but how to use previously created 'contact surfaces'?
Answers
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Hi @timonq
Never came across such problem. I will try with a sample model to check this and will keep you updated.
If you are using RBE2s then you can delete tie contact.
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I tried to change tie to rbe2 but still I need 1TB memory for scratch (core OUT) or 0,5TB RAM for core IN
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When I calculated this model using Abaqus solver I need much less memory.
Only solution I found is to change method from EIGRL to EIGRA (need only 13GB RAM)
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Hi @timonq
Can you share more details about type of analysis, number of modes requested (if it is a freq response or modal analysis), number of loadsteps, how big is the model?
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Hi,
Modal analysis: 5-350Hz (Abaqus solver found 4 resonance modes).
Number of nodes: 5 000 000
Elements order: HEXA and QUAD first, TETRA (most elements) and TRIA second
Now only one step: modal (in abaqus I set 4 loadsteps: modal and frequency response for all axis)
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Altair Employee