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Contact Problem in NLGEOM

Greetings,

I was modelling a cover-gasket-base assembly (1/1024 axisymmetric model to save running time) using optistruct, with NLGEOM analysis type. I was following all the steps in the tutorial example I, hereby, attached, but could not get the Model contacting each other. Could anyone tell me what I did wrong in the modelling?

Thank you very much and Regards

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Rahul Rajan_21763

Which version of Hyperworks you are using?

Regards

Rahul R

Altair Forum User

Dear Sir,

It is hyperworks v13

Thank you ans regards

Altair Forum User

Hi Arifin,

What is your objective with the analysis?

Maybe you should include non linearity in the material for rubber for instance.

Altair Forum User

Dear Mr Prakash,

We did use MATX42 (i have attached the model file in the first post btw). We want to measure the force required to compress the gasket by 2.25 mm, and check for the stress in the gasket also.

Thank you and regards

Altair Forum User

So we have received the .fem file of the tutorial example, and it could run perfectly on NLGEOM. Now we copy and follow everything to our model (except we use double contact at the top and bottom surfaces instead of just one contact at the top), still the contacts are not activated on our model. Could anyone really tells us what we did wrong. Else I am suspecting the problem is with the software (either bug or whatever).

Thank you and regards

Unable to find an attachment - read this blog

Altair Forum User

Hi Arifin,

Can you check the follow animation and let us know if this is what you are looking?

Altair Forum User

test.gif.5c1025786726ab581a46edbe709d272

Altair Forum User

Dear Mr Prakash,

That is exactly what we want to see in our model. Could you please tell us what did you do with the model?

Thank you very much and regards

Altair Forum User

So the problem in your model is coming from the contact1 (could be because of contact stiffness)

I changed the contact type to Slide instead of giving PCONT with NIC 250 on NLPARM.

try the same at your end.