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Spr3 modeling

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Topic starter
(@delron)
Unpaid Intern
Joined: 7 months ago

Hi all! I am relatively new in dyna. Trying to model spr3 element. But when I try to simulate simple tension case I got this error.

expanding memory to 83019 d 3724101 constrained spr 1
expanding memory to********* d 3724101 constrained spr 2

Error 70021 (OTH+21)
Memory is set 4429334040907560366 words short
memory size 325000000
Increase the memory size by one of the following
where #### is the number of words requested:
1) On the command line set - memory=####
2) In the input file define memory with *KEYWORD
i.e., *KEYWORD #### or *KEYWORD memory=####

No matter how much memmory I set it always demands more... How to solve the problem?

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Negative Volume
Posts: 641
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(@negativevolume)
CEO
Joined: 5 years ago

Hi @delron

I'm not familiar with SPR3. Is this in reference to *Constrained_interpolation_spotweld (SPR3) or *Mat_constrained_SPR3?

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Negative Volume
Posts: 641
Admin
(@negativevolume)
CEO
Joined: 5 years ago

I can say that generally errors like this indicate something is wrong with a constraint, to the point where Dyna is just endlessly trying to solve it. I would double check with the manual that you have the *Constrained_interpolation_spotweld defined appropriately. 

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Posts: 3
Topic starter
(@delron)
Unpaid Intern
Joined: 7 months ago

It is actually both. I am using spr3 element with defined Mat_constrained_SPR3. The problem is the simulation runs when I connect spr3 element to shells. But when it comes to beams I see this error. According to Ls_dyna r13 manual it should works with beams.

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3 Replies
Negative Volume
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(@negativevolume)
Joined: 5 years ago

CEO
Posts: 641

@delron Oh well that's your problem. Spotwelds are meant to connect nodes to surfaces, not beams. That's why you are getting the error. 

image

https://www.dynasupport.com/tutorial/ls-dyna-users-guide/constraints-and-spotwelds

 

What is the end goal you are trying to do with your simulation and why where you wanting to use SPR3?

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(@delron)
Joined: 7 months ago

Unpaid Intern
Posts: 3

@negativevolume I saw this info in Dyna manual about spr3

image

 

 

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Negative Volume
Admin
(@negativevolume)
Joined: 5 years ago

CEO
Posts: 641

@delron hm interesting…even still, curious what the end goal of doing something like this is

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