edge_to_surface contact

Altair Forum User

Hello all!

who have had problem like me and have solved it?

i'm trying to do edge_to_surface contact in optistruct.

i can't add model. 

if i have large model with ribs panel will impact to them.

could you give me any tricks to win it?

thanks a lot.

 

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Altair Forum User

Altair Forum User said:

i can't add model. 

 

Hi @Mrt

 

Can you explain what you mean by 'can't add model', please?

Altair Forum User

hello @Prakash Pagadala.

it's corporate secret.

i can only show pics. sorry=(

 

jiaru72300

Mrt  

try to use 'node to surface'

Altair Forum User

Hi,

 

There is no separate edge to surface contact in OptiStruct as in RADIOSS, but N2S will help. 

 

Unfortunately, auto-contact may not help to model.

Altair Forum User

@jiaru72300

@Prakash Pagadala

thanks, but i've yet tryed n2s, it's didn't help.

i tryed to create pairs ribs tube; and tube to ribs S-M and M-S, but it hasn't worked. i have been solving it issue for 3 weeks!

it issue have yet solved in NONLINEAR geometry implicit solver in optistruct (it uses radioss ), but i have got a task to convert it in quasi-static nonlinear static.

small ribs have distorted while plate has deformed.

have you got any idea, guys?

 

Altair Forum User

Hi,

 

Can you try with Large displacement analysis?

 

Here I am attaching a small model file with LGDISP activated and has an edge to Surface contact,

Unable to find an attachment - read this blog

Altair Forum User

hello @Prakash Pagadala!

of course, i have used large displacement analysis. it's my first goal to use nlstat large displacement analysis instead implicite nonlin-geom analysis.

thanks a lot, i'm going to see your file!

could your give me any advice how to solve large strain in my issue?

i think the problem is large distortion of elements.

 

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Altair Forum User

Hi,

 

Could you please share the entire.out file, please?

Altair Forum User

easy.)

Unable to find an attachment - read this blog

Altair Forum User

i use monitor, i can see that this is going wrong. 

Altair Forum User

you can see, i tryed to use finner mesh, but it didn,t help.

i'm just newbie in altair solvers, i have been using abqs for a long time.

Altair Forum User

Hi,

 

I can see that you are using PCONT with FREEZE on it. Is there a reason for that?

 

Can you change the stiffness on PCONT to AUTO instead of soft and check if that helps?

 

Also, please add CNTSTB card. 

Altair Forum User

Altair Forum User said:

I can see that you are using PCONT with FREEZE on it. Is there a reason for that?

 

Can you change the stiffness on PCONT to AUTO instead of soft and check if that helps?

 

Also, please add CNTSTB card. 

No. i have written about it in privious message. i've done finner mesh, i thought it will has helped. but i was wrong. there mesh has been connected grid to grid. i had released it and did finner mesh. and after it i've done TIE (for altair it's freeze). do you understand my explanation?

thanks, i will try to use your advice and after it i will write about the results.

Altair Forum User

unfortunately, it didn't help. element has been fully distorted.

 

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Karthic_22061

Hi @Mrt @Prakash Pagadala,

I am also facing the same issue of high element distortion. Any updates to solve this issue

Altair Forum User

Hi,

 

Can you try with ADJUST?

Altair Forum User

i haven't still solved it issue=(

Altair Forum User

Can someone share a test file?