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How to define the contact for simple support?

Altair Forum User

Hello, everyone! I am a beginner for Hyperwork and using Optistruct to solve some problems. I have a question to define the contact between rule and cylinder just like in the picture. Because of the load in the middle both side of the rule will go up. How could i define this simple support contact in Optistruct? Thank you very much!

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gopal_rathore

Hi,

You can define this by going to interfaces>type as contact>slide or tie type contact . Assign and master slave in the card edit.

Altair Forum User

Hi Bupaasi,

For a simple supported beam like this you can assign boundary condition (constraint) at the two ends of the beam.

Since you are a beginner in OptiStruct request you to refer this tutorial: http://www.altairhyperworks.com/training/self_paced/os_linear/content/linear_1/PDF/1a_doit.pdf

This tutorial is Stress and displacement analysis in a simply supported beam.

Altair Forum User

Hi,

You can define this by going to interfaces>type as contact>slide or tie type contact . Assign and master slave in the card edit.

Hello, Rathore

thank u very much for your reply. I have tried what u said in Optistruct. I defined the contact between plate and cylinder with slide (plate as master, cylinder as slave, material are the same). The result shows in this picture. It seems not real... With the load at the middle both sides of the plate should go up. But now both sides are ´´ stick´´ with the cylinders... Could u plz help me again? Thanks!

<?xml version="1.0" encoding="UTF-8"?>

Altair Forum User

Hi Bupaasi,

For a simple supported beam like this you can assign boundary condition (constraint) at the two ends of the beam.

Since you are a beginner in OptiStruct request you to refer this tutorial: http://www.altairhyperworks.com/training/self_paced/os_linear/content/linear_1/PDF/1a_doit.pdf

This tutorial is Stress and displacement analysis in a simply supported beam.

Hello, Johnson

thank you very much for your reply! Actually my model is not a simple supported beam, but the contact situation between parts is almost like the situation of simple supported beam. The tutorial is helpful! I understand now more about the beam. If i want to keep instead of beam all parts in the simulation, how could i define the contact between the beam and cylinders? Thanks again!

Altair Forum User

Hi Bupaasi,

Please find the attached document. All concepts related to OptiStruct contacts is available in this file.

Unable to find an attachment - read this blog

gopal_rathore

Hi Bupassi,

Is the contact type is SLIDE in card edit of interface defined?

gopal_rathore

Hi George,

With displacement levels of 25 mm does not this needs to be done in non-linear implicit analysis type to capture the contact and displacement accurately.

Altair Forum User

Hi Bupassi,

Is the contact type is SLIDE in card edit of interface defined?

Hello, Rathore

thanks again! I assigned the type of contact as ´´CONTACT´´ in card edit of interface. <?xml version="1.0" encoding="UTF-8"?>

and then i choose the the ´´slide´´ in the window next to the panel. Is that right?

gopal_rathore

Hi Bupaasi,

Yes,I was telling the same. Is this configuration simulated?

Also if you want to see the lifting of the plates from sides, I think implicit analysis (non-linear ) type would be good to capture as displacement is also of 25 mm.

Altair Forum User

Hi Bupaasi,

Yes,I was telling the same. Is this configuration simulated?

Also if you want to see the lifting of the plates from sides, I think implicit analysis (non-linear ) type would be good to capture as displacement is also of 25 mm.

Hi, rathore

thanks again! I have tried the simulation, and the results are the same. You mean this 25 mm displacement is real ,but in optistruct as Linear Solver the lifting won't be showed out?

gopal_rathore

Hi,

Can you upload the input file .hm?

Altair Forum User

Hi,

Can you upload the input file .hm?

Hello, Rathore

Sorry i reply u a little bit late, because i was on vacation last week. Here is the hm file. Thanks a lot!

Unable to find an attachment - read this blog