optistruct RBE3 conver to Radioss

Altair Forum User

I tried to convert optistruct RBE3 to Radioss format in Hypermesh. 

After conversion, the RBE3 become RBODY which is fine, but all my dependent nodes disappeared. 

My original dependent nodes are 6-10 nodes, after conversion, only 1 dependent node remaining.

 

Is that my step is wrong or any other step i need to follow?

Altair Forum User

Hi Kin,

Instead of RBE3, try creating RBE2 in OptiStruct and convert the same into RADIOSS. Please try with this option.

Altair Forum User

my model already full with RBE3, how can I convert RBE3 to RBE2 in optistruct?

Altair Forum User

Hi,

From 1D page, select config edit panel, select the RBE3 elements and select the new config as rigidlink and click switch so that the element type will be switched to RBE2.

 

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

 

 

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

Altair Forum User

Hi George,

 

It works!!!!

Thanks a lot.

 

Can I further my question here with the Optistruct conversion to Radioss?

 

I am converting CBEAM circle section to Radioss, it turn to BEAM3N, It is fine but the BEAM3N need to redefine the cross section.

I had redefine the BEAM3N cross section as circle, when I export to .rad file and using hypercrash to look into it, the circle is not defined.

How is this can be happen ?

Any faster way to convert the CBEAM (Optistruct-PBEAM) to BEAM3N (Radioss /PROP/BEAM) with full information with it?

 

Thanks

Kin Poh

Altair Forum User

Hi Kin Poh,

I tried the same with a simple model and it worked well in HyperMesh.  Instead of HyperCrash can you check in HyperMesh?

Altair Forum User

Hi George,

 

It work fine in your model for which question?

 convert the CBEAM (Optistruct-PBEAM) to BEAM3N (Radioss /PROP/BEAM)?

I can convert it successfully but the property side does not remain the same.

 

Thanks.

 

Kin Poh

Altair Forum User

Hi Kin Poh,

PBEAM is supported and it will be converted to /PROP/BEAM. 

I'm attaching a document which shows the supported OptiStruct keywords in RADIOSS. Please go through the same.

Unable to find an attachment - read this blog

Altair Forum User

Hi George, 

 

I got this list, but it does not happen in my case.

You could try it with simple model, In OS BEAM cross section as circle(using hyperbeam to define), then see how it turn to Radioss after convert. whether the cross section remain the same.

 

Thanks.

Kin Poh

Altair Forum User

Hi Kin Poh,

I created a circle section in OS and converted to RADIOSS, and the cross section was retained. These steps were captured in a screen capture tool and attached along for your reference. 

The file is saved in .swf format, which plays in GOM player.

Unable to find an attachment - read this blog

Altair Forum User

Hi George,

 

I follow all the step of you referred in the .swf, but it end up still fail.

Please see below picture. 

My beams section also seems name changed, and not working anymore in the BEAM3N

 

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

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

Altair Forum User

Hi Kin Poh,

Can you please share the model file through the secure dropbox link so that we can review.

Altair Forum User

Hi George,

 

can I have your email?

 

Thanks.

Kin Poh

Altair Forum User

Hi Kin Poh,

Please use the Secure File Dropbox link in my signature, so that the model file will directly come to my inbox.

 

 

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

Altair Forum User

Hi George, 

 

File send

 

Thanks

Altair Forum User

Hi Kin Poh,

In the beam property tab, instead of 'Do Not Export' option change it to Export option, as shown in the image below and try converting the mode to RADIOSS.

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

Altair Forum User

Hi George,

 

My option is always showing 'Hide In Menu/Export'. even in the example that I send to you.

Could you help to demo a .swf with my example sending?

I still could not get it from my side.

 

Thanks.

 

Kin Poh

Altair Forum User

Hi George,

 

The are able to convert, the problem is all the hyperbeam section run off.

 

Thanks

Kin Poh

Altair Forum User

Hi Kin Poh,

I have attached the demo of the same model you have shared.

 

Unable to find an attachment - read this blog

Altair Forum User

Hi George,

 

it worked but not perfectly work, anywhere I am able to change the config from generic to standard, then able to use the beam section (hyperbeam).

 

But i have another question, when I export it as Radioss solver, the hyperbeam section gone, and I use hypercrash to import the solver deck, it changed.

How can I remain the hyperbeam section as below in the solver deck and hypercrash?

Altair Forum User

Hi george, 

 

FYI, in the solver deck, it shows

 

Altair Forum User

Hi Kin Poh,

HyperCrash visualizes all beams like an 'I' section (that is it is just to show that it is a 'beam') and it doesn't show the actual cross-section. So even if you had a tube, or box section, HyperCrash would show it as an I section. In fact for RADIOSS there is no tube, box etc... just the basic properties. When HyperMesh is used and it associate a Hyperbeam section, HyperMesh will show that section (linked through HM comments) but on the RADIOSS side it is just passing the section area and inertia.

 

Altair Forum User

Hi George,

 

With the section area and inertia info, yes, it passed the info to the prop/beam.

Example, If my type of cross section is tube in HM with hyperbeam, after that in hypercrash it shows the same section area and inertia, can I treat it as the same for my crash simulation?

 

Thanks.

 

Kin Poh

Altair Forum User

Hi Kin Poh,

Yes, RADIOSS doesn't have 'standard sections' they are just area and inertia and so the solver will take the same information.